Καθηγητής Παναγιώτης Βαρώτσος
Professor Panayiotis Varotsos

e-mail: pvaro@phys.uoa.gr, pvaro@otenet.gr

(Last updated: 01-05-2024)

  1. List of Publications (refereed) by P. Varotsos et al.
  2. Additional Publications (non-peer-reviewed) by P. Varotsos et al.
  3. Books by P.A. Varotsos

I. List of Publications (refereed) by P. Varotsos et al.
(pdf format also available for selected publications)

  1. P. Varotsos, Conductivity and dielectric constants of LiD, Physical Review B 9, 1866-1869, 1974.
  2. P. Varotsos and D. Miliotis, New aspects on the dielectric properties of the alkali halides with divalent impurities, Journal of Physics and Chemistry of Solids 35, 927-930, 1974.
  3. P. Varotsos and W. Katsaros, Dielectric loss of LiD doped with Mg++, Physica Status Solidi (a) 25, 457-461, 1974.
  4. P. Varotsos, S. Mourikis and D. Miliotis, Application of the “Thomas-Fermi” statistical model to the crystals KCl:Sm++, Yb++ and Eu++, Physica Status Solidi (b) 66, K15-K17, 1974.
  5. P. Varotsos, Study of the conductivity and the reorientation mechanism in the caesium halides doped with Cd++ and Pb++, Physica Status Solidi (a) 26, 311-315, 1974.
  6. P.A. Varotsos and S. Mourikis, Difference in conductivity between LiD and LiH crystals, Physical Review B 10, 5220-5224, 1974.
  7. P. Varotsos and S. Mourikis, Activation energies for reorientation of complexes in caesium halides doped with Cd++ and Pb++, Physica Status Solidi (a) 28, K65-K67, 1975.
  8. D. Kostopoulos, P. Varotsos and S. Mourikis, The conductivity of crystalline NaI, Canadian Journal of Physics 53, 1318-1320, 1975.
  9. G. Afordakos and P. Varotsos, The thermoluminescence of X-ray irradiated LiD, Physica Status solidi (a) 31, K57-K60, 1975.
  10. P. Varotsos, K. Alexopoulos and F. Beniere, Calculation of the migration barriers in caesium halides, Physical Review B 12, 4403-4404, 1975.
  11. P. Varotsos, Dielectric properties of CsI doped with Ca++ or Sr++, Physica Status Solidi (a) 32, 617-620, 1975.
  12. P. Varotsos, Comments on the formation entropy of a Frenkel defect in BaF2 and CaF2, Physical Review B 13, 938, 1976.
  13. P. Varotsos, The conductivity of LiD and LiH, Journal de Physique 37, C7-327-330, 1976.
  14. P. Varotsos and K. Alexopoulos, “Estimation of the migration enthalpy and entropy for cation vacancy motion in alkali halides with the NaCl-type structure”, Physical Review B 15, 2348-2351, 1977.
  15. P. Varotsos, A comparison of the migration entropy for the cation and the anion vacancy motion in alkali halides with NaCl and CsCl type structure, Journal de Physique Lettres 38, L171-172, 1977.
  16. P. Varotsos and K. Alexopoulos, Calculation of the formation entropy of vacancies due to anharmonic effects, Physical Review B 15, 4111-4114, 1977.
  17. P. Varotsos and K. Alexopoulos, Comment on a correlation between the migration enthalpy of a cation vacancy in alkali halides with NaCl structure and their melting points, Physical Review B 15, 5994-5995, 1977.
  18. P. Varotsos and K. Alexopoulos, The true and the experimental entropy values of vacancies, Journal de Physique Lettres 38, L 329-330, 1977.
  19. P. Varotsos and K. Alexopoulos, The curvature in conductivity plots of alkali halides as a consequence of anharmonicity, Journal of Physics and Chemistry of Solids 38, 997-1001, 1977.
  20. P. Varotsos, D. Kostopoulos, S. Mourikis and S. Kouremenou, ITC experiment on LiD-Mg++ and LiH-Ca++ crystals, Solid State Communications 21, 831-832, 1977.
  21. P.A. Varotsos, On the temperature and pressure dependence of the defect formation volume in ionic crystals, Journal de Physique Lettres 38, L455-458, 1977.
  22. P. Varotsos, Diffusion of monovalent ions in an alkali halide crystal, Physica Status Solidi (a) 45, K9-K12, 1978.
  23. P.A. Varotsos, On the relation of the vacancy formation parameters and the Gruneisen constant in metals, Physics Letters 64 A, 411-412, 1978.
  24. P. Varotsos, The thermal expansion coefficient of the defect entropy volume, Journal of Physics F: Metal Physics 8, 1, L9-11, 1978.
  25. P.A. Varotsos, The formation volume of Frenkel defect in silver halides, Journal of Physics and Chemistry Solids 39, 5, 513-514, 1978.
  26. P.A. Varotsos and K. Alexopoulos, The curvature in conductivity plots of silver halides as a consequence of anharmonicity, Journal of Physics and Chemistry of Solids 39, 7, 759-761, 1978.
  27. P. Varotsos, On the correlation of the formation enthalpy for a Schottky defect in alkali halides and the melting point, Solid State Communications 25, 8, 583-585, 1978.
  28. P. Varotsos and W. Ludwig, On a new analysis of the diffusion experiments under pressure, Journal of Physics C: Solid State Phys. 11, L305-309, 1978.
  29. P. Varotsos, W. Ludwig and C. Falter, On a new analysis of the diffusion data in sodium under pressure, Journal of Physics C: Solid State Phys. 11, L311-315, 1978.
  30. P.A. Varotsos, The temperature dependence of the static dielectric constant, Journal de Physique Lettres 39, L79-82, 1978.
  31. P.A. Varotsos, On the analysis of the defect-experimental data in metals, Journal of Physics F: Metal Physics 8, No 7, 1373-1378, 1978.
  32. P. Varotsos and K. Alexopoulos, Calculation of the migration volume of vacancies in ionic solids from macroscopic parameters, Physica Status Solidi (a) 47, K133-136, 1978.
  33. C. Falter, W. Zierau and P. Varotsos, On the energy of formation of defects, Solid State Communications 27, 401-404, 1978.
  34. P. Varotsos, W. Ludwig and K. Alexopoulos, Calculation of the formation volume of vacancies in solids, Physical Review B 18, 2683-2691, 1978.
  35. K. Alexopoulos and P. Varotsos, On the curvature of Arrhenius plots of diffusion and its disappearance under pressure with a single-vacancy model, Journal of Physics F: Metal Physics 8, 11, 2227-2232, 1978.
  36. P.A. Varotsos, Influence of anharmonicity on some transport properties of AgBr, Journal de Physique 39, 1247-1249, 1978.
  37. P.A. Varotsos, On the pressure variation of the excessive specific heat associated with vacancies, Physica Status Solidi (a) 49, K57-61, 1978.
  38. P.A. Varotsos, An estimate of the pressure dependence of the dielectric constant in alkali halides, Physica Status Solidi (b) 90, 339-343, 1978.
  39. P.A. Varotsos, A macroscopic calculation of the specific heats of a vacancy, Physica Status Solidi (b) 90, 629-633, 1978.
  40. P. Varotsos and K. Alexopoulos, On the anomalous curvature of the diffusion plot of bromine in AgBr, Physica Status Solidi (b) 92, 633-637, 1979.
  41. C. Falter, W. Zierau and P. Varotsos, Activation Volume for self-diffusion and for the diffusion of impurities in Lead, Journal of Applied Physics, 50, 5764-5767, 1979.
  42. P. Varotsos and K. Alexopoulos, On the possibility of the enthalpy of a Schottky defect decreasing with increasing temperature, J. Physics C: Solid State 12, L761-764, 1979.
  43. P. Varotsos, Comments on the migration volume of vacancies in Solids, Physica Status Solidi (a) 55, K63-66, 1979.
  44. P. Varotsos, Entropy and volume of solution of substitutional Impurities in Solids, Physica Status Solidi (a) 55, K139-142, 1979.
  45. P. Varotsos and E. Aifantis, Comments on the diffusion of a gas in linear elastic solid, Acta Mechanica 36, 129-133, 1980.
  46. P. Varotsos, On the temperature and pressure variation of the static dielectric constant in alkaline earth fluorides, Journal of Applied Physics, 51, 4553-4554, 1980.
  47. P. Varotsos, The dielectric loss of X-irradiated LiD + Mg++, Journal de Physique 41, 377-379, 1980.
  48. D. Kostopoulos, P. Varotsos and S. Mourikis, Measurement of ionic thermocurrents in Sodium Iodide, J. Physics C: Solid State 13, 3003-3009, 1980.
  49. P. Varotsos, Comments on the dielectric relaxation in doubly doped CaF2, Physical Review B 21, 874-875, 1980.
  50. P. Varotsos and K. Alexopoulos, Migration entropy for the bound fluorine motion in alkaline earth fluorides, J. Physics and Chemistry of Solids 41, 443-446, 1980.
  51. P. Varotsos, On the formation and activation volume of a vacancy in tetragonal metals, Journal of Physics F: Metal Physics 10, 571-574, 1980.
  52. P. Varotsos and K. Alexopoulos, On the connection between the specific heat of a Schottky defect and the curvature observed in the Arrhenius plots in ionic materials, Journal de Physique 41, C6-526-529, 1980.
  53. P. Varotsos and K. Alexopoulos, Temperature dependence of the thermal-expansion coefficient of vacancies, Physical Review B 21, 3379-3382, 1980.
  54. P. Varotsos and K. Alexopoulos, Calculation of diffusion coefficients at any temperature and pressure from a single measurement. I. Self diffusion, Physical Review B 22, 3130-3134, 1980.
  55. P. Varotsos and K. Alexopoulos, Prediction of the compressibility of mixed alkali halides, J. Physics and Chemistry of Solids 41, 1291-1294, 1980.
  56. P. Varotsos, On the thermal expansivity of alkali halide mixed crystals, Physica Status Solidi (b) 100, K47-51, 1980.
  57. P. Varotsos, On the elastic constants of PdD and PdH alloys, Physica Status Solidi (a) 61, K35-37, 1980.
  58. P. Varotsos, Determination of the dielectric constant of alkali halide mixed crystals, Physica Status Solidi (b) 100, K133-138, 1980.
  59. P. Varotsos, On the temperature variation of the bulk modulus of mixed alkali halides, Physica Status Solidi (b) 99, K93-96, 1980.
  60. P. Varotsos, D. Kostopoulos and S. Mourikis, ITC measurements on Sodium fluoride doped with Calcium, Physica Status Solidi (a) 57, 331-335, 1980.
  61. P. Varotsos and K. Alexopoulos, On the extraction of the vacancy formation parameters from specific heat data, Physica Status Solidi (a) 58, 639-644, 1980.
  62. P. Varotsos and K. Alexopoulos, On the coefficient of thermal expansion associated to Cd Impurities and vacancies in AgBr, Physica Status Solidi (b) 102, K63-66, 1980.
  63. P. Varotsos and K. Alexopoulos, Determination of the compressibility of an alloy from its density, Physica Status Solidi (b) 102, K67-72, 1980.
  64. P. Varotsos and K. Alexopoulos, On the question of the calculation of migration volume in ionic crystals, Phil. Magazine A 42, 1, 13-18, 1980.
  65. P. Varotsos and K. Alexopoulos, Negative activation volumes of defects in solids, Physical Review B 21, 4898-4899, 1980.
  66. P. Varotsos, Determination of the composition of the maximum conductivity or diffusivity in mixed alkali halides, J. Physics and Chemistry of Solids 42, 405-407, 1981.
  67. P. Varotsos and K. Alexopoulos, Migration parameters for the bound fluorine motion in alkaline earth fluorides. II, J. Physics and Chemistry Solids 42, 409-410, 1981.
  68. P. Varotsos and K. Alexopoulos, Decisive importance of the bulk modulus and the anharmonicity in the calculation of migration and formation volumes, Physical Review B 24, 904-910, 1981.
  69. K. Alexopoulos and P. Varotsos, Calculation of diffusion coefficients at any temperature and pressure from a single measurement. II. Heterodiffusion, Physical Review B 24, 3606-3609, 1981.
  70. D. Kostopoulos, S. Mourikis, and P. Varotsos, Ionic thermocurrent in KCl doped with SO4--, J. Physique (Paris) 42, 1481-1483, 1981.
  71. P. Varotsos and K. Alexopoulos, Current methods of lattice defect analysis using dilatometry and self- diffusion. Critical review and proposals, Physica Status Solidi (b) 110, 9-31, 1982. (Review Article)
  72. P. Varotsos, K. Alexopoulos and K. Nomicos, Comments on the pressure variation of the Gibbs energy for bound and unbound defects, Physica Status Solidi (b) 111, 581-590, 1982.
  73. D. Kostopoulos, S. Kouremenou, P. Varotsos and S. Mourikis, Thermocurrents in ferroelectric materials, Physica Status Solidi (a) 70, K19-21, 1982.
  74. P. Varotsos and K. Alexopoulos, Connection between the formation volume and formation Gibbs energy in noble gas solids, Physical Review B 30, 7305-7306, 1984.
  75. P. Varotsos, K. Alexopoulos and M. Lazaridou, On the proportionality of the migration volume and the migration enthalpy in fluorides, Physica Status Solidi (b) 125, K109-112, 1984.
  76. P. Varotsos and K. Alexopoulos, Physical properties of the variations of the electric field of the earth preceding earthquakes, I. Tectonophysics 110, 73-98, 1984. tecto84a.pdf
  77. P. Varotsos and K. Alexopoulos, Physical properties of the variations of the electric field of the earth preceding earthquakes, II. Determination of epicenter and magnitude, Tectonophysics 110, 99-125, 1984. tecto84b.pdf
  78. K. Meyer, P. Varotsos, K. Alexopoulos and K. Nomicos, Efficiency test of earthquake prediction around Thessaloniki from electrotelluric precursors, Tectonophysics 120, 153-161, 1985.
  79. P. Varotsos, K. Alexopoulos and M. Lazaridou, Interconnection of isothermal elastic data with self- diffusion in sodium, Physical Review B 31, 8263-8264, 1985.
  80. M. Lazaridou, K. Alexopoulos and P. Varotsos, Interconnection of activation volumes and activation enthalpies in cubic lead fluoride doped with alkali- metal cations, Physical Review B 31, 8273-8274, 1985.
  81. P. Varotsos, K. Alexopoulos and M. Lazaridou, Defect entropies and enthalpies in SrF2, J. Physics and Chemistry of Solids 46, 1109, 1985.
  82. M. Lazaridou, C. Varotsos, K. Alexopoulos and P. Varotsos, Point defect parameters of LiF, J. Physics C: Solid State 18, 3891-3895, 1985.
  83. P. Varotsos, K. Alexopoulos, C. Varotsos and M. Lazaridou, Interconnection of point defect parameters in BaF2, Physica Status Solidi (a) 88, K137-140, 1985.
  84. C. Varotsos, M. Lazaridou and P. Varotsos, Migration and activation defect volumes in CdF2, Physical Review B 32, 2634-2635, 1985.
  85. C. Varotsos, M. Lazaridou, K. Alexopoulos and P. Varotsos, Comments on “The temperature and pressure dependence of disaccommodation in a Manganese Zince Ferrite single crystal”, Jpn. J. Appl. Phys. 24, 6, 781, 1985.
  86. K. Eftaxias, J. Grammatikakis and P. Varotsos, Correlation between the self-diffusion coefficient of Lithium and the equation of state, Physical Review B 32, 5462-5463, 1985.
  87. C. Varotsos, M. Lazaridou, K. Alexopoulos and P. Varotsos, Point defect entropies and enthalpies in KCl, Physica Status Solidi (b) 130, K105-107, 1985.
  88. P. Varotsos, J. Grammatikakis, K. Eftaxias and C. Varotsos, Electrical properties of non-irradiated and X- irradiated LiH and LiD, Radiation Effects 99, 599-604, 1986.
  89. C. Varotsos, M. Lazaridou and P. Varotsos, On the connection of the formation enthalpy of a Schottky defect in insulators with the Debye temperature, Radiation Effects 99, 669-673, 1986.
  90. P. Varotsos, C. Varotsos, V. Hadjikontis and M. Lazaridou, On a plausible explanation of the connection of point defect parameters with the melting point, J. Physics and Chemistry of Solids 47, 79-82, 1986.
  91. K. Alexopoulos, M. Lazaridou and P. Varotsos, Activation volumes in lead halides and other solids, Phys. Rev., B, 33, 2838-2841, 1986.
  92. E. Dologlou and P. Varotsos, Thermally stimulated currents in rocks, Journal of Geophysics 59, 177-182, 1986.
  93. K. Eftaxias, V. Hadjikontis and P. Varotsos, Comments on the analysis of self-diffusion in Li probed by spin lattice relaxation of Li-nuclei, J. Phys. F: Met. Phys. 16, 791-794, 1986.
  94. P. Varotsos, K. Alexopoulos, K. Nomicos and M. Lazaridou, Earthquake prediction and electric signals, Nature 322, 120, 1986.
  95. P. Varotsos, Earthquake prediction in Greece based on seismic electric signals; Period: January 1, 1984 to March 18, 1986, ANNO XLV Bolletino di Geodesia e Scienze Affini 2, 192-202, 1986.
  96. P. Varotsos and K. Alexopoulos, Physical properties of the variations in the electric field of the earth preceding earthquakes, III, Tectonophysics 136, 335-339, 1987.
  97. P. Varotsos, K. Alexopoulos, K. Nomicos and M. Lazaridou, Official earthquake prediction procedure in Greece, Tectonophysics 152, 193-196, 1988.
  98. P. Varotsos, K. Eftaxias and V. Hadjikontis, Comments on the calculation of the thermodynamic properties of metals at high temperatures, Phys. Rev. B 38, 4296-4298, 1988.
  99. V. Hadjicontis, K. Eftaxias and P. Varotsos, Thermodynamic properties of defects in crystals calculated on the basis of the bulk elastic data, Phys. Rev., B, 37, 4265-4266, 1988.
  100. P. Varotsos, Correlation between positron lifetime spectroscopy and self-diffusion parameters in Indium, J. Phys. F: Met. Phys. 18, 595-599, 1988.
  101. P. Varotsos, Thermodynamic criterion for the analysis of point defect data in solids, Physical Review B 37, 6511-6512, 1988.
  102. P. Varotsos, K. Eftaxias and V. Hadjicontis, Defect parameters obtained from positron annihilation and self-diffusion experiments in Silicon, Phys. Rev. B 38, 6328-6329, 1988.
  103. P. Varotsos, and K. Alexopoulos, Physical properties of the variation of the electric field of the earth preceding earthquakes-reply, Tectonophysics, 161, 58-62, 1989.
  104. P. Varotsos and K. Eftaxias, High temperature vacancy concentration in Cu, Phys. Rev. B 40, 9963-9964, 1989.
  105. P. Varotsos, Evaluation of Diffusion Coefficients, in “Diffusion in Materials”, Eds. A. L. Laskar, J. L. Bocquet, G. Brebec and C. Monty, NATO ASI Series 179, 187-202 1989. (Review paper).
  106. P. Varotsos, Why are Geophysicists sceptical about the VAN method of Seismic forecasting - Response, La Recherche 21, 1076, 1990.
  107. P. Varotsos, K. Eftaxias and K. Alexopoulos, Comments on Self-diffusion data in Tungsten, Phys. Rev. B 43, 5170-5171, 1991.
  108. P. Varotsos and K. Alexopoulos, La Methode VAN, La Recherche 22, 220, 1991.
  109. P. Varotsos and M. Lazaridou, Latest aspects of earthquake Prediction in Greece based on Seismic Electric Signals. I, Tectonophysics 188, 321-347, 1991. Tecto91.pdf
  110. P. Varotsos, K. Alexopoulos and M. Lazaridou, On recent seismic electrical signal activity in nothern Greece, Tectonophysics 188, 403-405, 1991.
  111. P. Varotsos, K. Alexopoulos and M. Lazaridou, Results of a recent VAN-prediction on Greek earthquakes announced at a Japanese Meeting, NewsLetter of the Jap. Seism. Soc. 3, 4, 26-29, 1991.
  112. P. Varotsos, N. Bogris and A. Kiritsis 1992, Comments on the depolarization currents stimulated by variations of temperature and pressure, J. Phys. Chem. Solids, 53, 8, 1007-1011, 1992.
  113. P. Varotsos, K. Alexopoulos and M. Lazaridou, Comment on ‘Evaluating the statistical validity beyond chance of VAN earthquake precursors’ by Francesco Mulargia and Paolo Gasperini, Geophys. J. Int. 111, 1, 1992.
  114. P. Varotsos, K. Alexopoulos and M. Lazaridou, Latest aspects of earthquake prediction in Greece based on Seismic Electric Signals II, Tectonophysics 224, 1-37 1993. Tecto93.pdf
  115. P. Varotsos, K. Alexopoulos, M. Lazaridou, and T. Nagao, Earthquake predictions issued in Greece by Seismic Electric Signals since February 6. 1990, Tectonophysics 224, 269-288, 1993.
  116. P. Varotsos, K. Alexopoulos and M. Lazaridou, A reply to “evaluation and interpretation of thirteen official VAN telegrams for the period September 10, 1986 to April 28, 1988” by J. Drakopoulos, G.N. Stavrakakis and J. Latoussakis, Tectonophysics 224, 237-250, 1993.
  117. A. Ifantis, G-Akis Tselentis, P. Varotsos and C. Thanassoulas, Long-term variations of the earth’s electric field preceding two earthquakes in Greece, Acta Geophys. Pol., 41, 4, 337-350, 1993.
  118. 118. P. Varotsos, S. Uyeda, K. Alexopoulos, T. Nagao and M. Lazaridou, Prediction of Recent Destructive Seismic Activities in Greece based on Seismic Electric Signals, in “Electromagnetic Phenomena Related to Earthquake Prediction”, Edited by M. Hayakawa and Y. Fujinawa. pp. 13-24. (Terra Scientific Publishing Company, Tokyo, 1994).
  119. P. Varotsos, K. Eftaxias, M. Lazaridou, G. Antonopoulos and J. Makris, recent VAN results on earthquake prediction in Greece by geoelectric current (in Japanese), Jishin 17, 18-26, 1994.
  120. M. Hayakawa, Y. Fujinawa, F.F. Evison, V.A. Shapiro, P. Varotsos, A.C. Fraser-Smith, O.A. Molchanov, O.A. Pokhotelov, Y. Enomoto and H.H. Schloessin, What is the Future Direction of Investigation on Electromagnetic Phenomena Related to Earthquake Prediction?, in “Electromagnetic Phenomena Related to Earthquake Prediction”, Edited by M. Hayakawa and Y. Fujinawa. pp. 667-677 (Terra Scientific Publishing Company, Tokyo, 1994).
  121. A. Vassilikou-Dova, S. Grigorakakis, P. Varotsos, A. Kapetanaki and D. Koutsikos, Study of the Denaturation Process in Albumin-Urea Solutions by Means of the Thermally Stimulated Depolarization Currents Technique, J. Phys. Chem., 100, 5, 1914-1917, 1996.
  122. P. Varotsos, K. Eftaxias, F. Vallianatos and M. Lazaridou, Basic principles for evaluating an earthquake prediction method, Geophys. Res. Lett. 23, 11, 1295-1298, 1996.
  123. P. Varotsos, K. Eftaxias, M. Lazaridou, E. Dologlou and V. Hadjicontis, Reply to “Inaccuracies in seismicity and magnitude data used by P. Varotsos and coworkers, by M. Wyss, Geophys. Res. Lett. 23, 11, 1303-1306, 1996.
  124. P. Varotsos, K. Eftaxias, M. Lazaridou, E. Dologlou and V. Hadjicontis, Reply to “Probability of chance correlations of earthquakes with predictions in areas of heterogeneous seismicity rate: the VAN case”, by M. Wyss and A. Allmann, Geophys. Res. Lett. 23, 11, 1311-1314, 1996.
  125. P. Varotsos and M. Lazaridou, Reply to “VAN earthquake predictions - an attempt at statistical evaluation, by Y. Y. Kagan, Geophys. Res. Lett. 23, 11, 1319-1321, 1996.
  126. P. Varotsos, K. Eftaxias and M. Lazaridou. Reply I to “VAN: Candidacy and validation with the latest laws of the game” by F. Mulargia and P. Gasperini, and “Precursor candidancy and validation; the VAN case so far” by F. Mulargia and P. Gasperini. Geophys. Res. Lett. 23, 11, 1331-1334, 1996.
  127. P. Varotsos, K. Eftaxias and M. Lazaridou. Reply II to “VAN: Candidacy and validation with the latest laws of the game”, by F. Mulargia and P. Gasperini, and “Precursor candidancy and validation: the VAN case so far”, by F. Mulargia and P. Gasperini. Geophys. Res. Lett. 23, 11, 1335-1338, 1996.
  128. P. Varotsos, K. Eftaxias and M. Lazaridou, Reply to “The VAN method: Contradictory and misleading results since 1981”, by G. Stavrakakis and J. Drakopoulos, Geophys. Res. Lett. 23, 11, 1351-1354, 1996.
  129. P. Varotsos, K. Eftaxias and M. Lazaridou, Reply to “A false alarm based on electrical activity recorded at a VAN-station in Northern Greece in December 1990”, by J. Drakopoulos and G. Stavrakakis, Geophys. Res. Lett. 23, 11, 1359-1362, 1996.
  130. P. Varotsos, M. Lazaridou and V. Hadjicontis, Reply to “Earthquake prediction evaluation standards applied to the VAN method”, by D. D. Jackson, Geophys. Res. Lett. 23, 11, 1367-1370, 1996.
  131. P. Varotsos and M. Lazaridou, Reply to “The VAN earthquake predictions”, by D. A. Rhoades and F. F. Evison, Geophys. Res. Lett. 23, 11, 1375-1378, 1996.
  132. P. Varotsos and M. Lazaridou, Reply to “Dicing with earthquakes”, by Paul W. Burton, Geophys. Res. Lett. 23, 11, 1383-1386, 1996.
  133. P. Varotsos and M. Lazaridou, Reply to “Difficulty of statistical evaluation of an earthquake prediction method”, by H. Utada, Geophys. Res. Lett. 23, 11, 1395-1398, 1996.
  134. P. Varotsos and M. Lazaridou, Reply to “A few considerations for ascribing statistical significance to earthquake predictions”, by P. B. Stark, Geophys. Res. Lett. 23, 11, 1403-1405, 1996.
  135. P. Varotsos and M. Lazaridou, Reply to “A note on evaluating VAN earthquake predictions”, by G-Akis Tselentis and Nicos S. Melis, Geophys. Res. Lett. 23, 11, 1415-1416, 1996.
  136. P. Varotsos and M. Lazaridou, Reply to “Probability of earthquake occurrence in Greece with special reference to the VAN predictions”, by Y. Honkura and N. Tanaka, Geophys. Res. Lett. 23, 11, 1421-1423, 1996.
  137. P. Varotsos and M. Lazaridou, Reply to “Statistical evaluation of the VAN method using the historic earthquake catalog in Greece”, by Richard L. Aceves, Stephen K. Park and David J. Strauss, Geophys. Res. Lett. 23, 11, 1429-1431, 1996.
  138. P. Varotsos and M. Lazaridou, Reply to “Statistical tests of VAN earthquake predictions: comments and reflections”, by Y.Y. Kagan and D. D. Jackson, Geophys. Res. Lett. 23, 11, 1437-1440, 1996.
  139. P. Varotsos, K. Eftaxias, E. Skordas, V. Hadjicontis and M. Lazaridou, Reply to “Rebuttal to Replies I and II by Varotsos et al.”, by F. Mulargia, W. Marzocchi and P. Gasperini, Geophys. Res. Lett. 23, 11, 1341-1342, 1996.
  140. P. Varotsos, N. Sarlis and M. Lazaridou, Reply to “Rebuttal to reply by Varotsos and Lazaridou: Towards Plainly Successful Prediction”, by Paul W. Burton, Geophys. Res. Lett. 23, 11, 1389-1390, 1996.
  141. P. Varotsos, V. Hadjicontis, K. Eftaxias, E. Skordas and M. Lazaridou, Reply to “Re-Rebuttal to the Reply of Varotsos et al.”, by F. Mulargia, W. Marzocchi, and P. Gasperini, Geophys. Res. Lett. 23, 11, 1345-1346, 1996.
  142. P. Varotsos, K. Eftaxias, M. Lazaridou, G. Antonopoulos, J. Makris and J. Poliyiannakis, “Summary of the five principles suggested by P. Varotsos et al. (1996) and the additional questions raised in this debate”, Geophys. Res. Lett. 23, 11, 1449-1452, 1996.
  143. P. Varotsos, M. Lazaridou, K. Eftaxias, G. Antonopoulos, J. Makris and J. Kopanas, “Short term earthquake prediction in Greece by Seismic Electric Signals” in “A Critical Review of VAN”, Earthquake prediction from seismic electric signals, ed. Sir J. Lighthill, World Scientific, Singapore, 29-76, 1996.
  144. P. Varotsos, K. Eftaxias, M. Lazaridou, K. Nomicos, N. Sarlis, N. Bogris, J. Makris, G. Antonopoulos and J. Kopanas, Recent earthquake prediction results in Greece based on the observation of seismic electric signals, Acta Geophys. Pol., Vol. 44, 4, 301-327, 1996.
  145. P. Varotsos, N. Sarlis, M. Lazaridou and N. Bogris, Statistical evaluation of earthquake prediction results. Comments on the success rate and alarm rate, Acta Geophys. Pol., 44. 4, 329-347, 1996.
  146. P. Varotsos, N. Sarlis, M. Lazaridou, and P. Kapiris, Transmission of stress induced electric signals in dielectric media, J. Appl. Phys. 83, 1, 60-70, 1998. d13.pdf
  147. P. Varotsos, N. Sarlis, M. Lazaridou, and P. Kapiris, A possible explanation for detecting Electric Signals at certain sites of the earth’s surface, Studying the Earth from Space, I, 123-129, 1998.
  148. P. Varotsos, K. Eftaxias, M. Lazaridou, N. Bogris, and J. Makris, Note on the extension of the SES sensitive area at Ioannina station, Greece, Acta Geophys. Pol., 46, 1, 55-60, 1998.
  149. P. Varotsos, N. Sarlis, and M. Lazaridou, Statistical evaluation of earthquake prediction results. Comments on the success rate and alarm rate, II, Acta Geophys. Pol., 46, 3, 261-271, 1998.
  150. P. Varotsos, N. Bogris, K. Eftaxias, V. Hadjicontis, M. Lazaridou, and M. Kefalas, Additional evidence on the extent of the SES sensitive area around Ioannina, Acta Geophys. Pol., 46, 3, 273-275, 1998.
  151. P. Varotsos, N. Bogris, K. Eftaxias, V. Hadjicontis, M. Lazaridou, and M. Kefalas, On the extent of the SES sensitive area around Ioannina. Additional evidence II, Acta Geophys. Pol., 46, 4, 411-413, 1998.
  152. P. Varotsos, N. Sarlis, and M. Lazaridou, Claims of success in using geoelectrical precursors to predict earthquakes are criticized and defended, PHYSICS TODAY, 51, Issue 6, 96-100 (June 1998). Also published in Parity (in Japanese; translation from PHYSICS TODAY).
  153. P. Varotsos, N. Sarlis, N. Bogris, J. Makris, P. Kapiris, and A. Abdulla, A comment on the ΔV/L-criterion for the identification of Seismic Electric Signals, in Atmospheric and Ionospheric Electromagnetic Phenomena Associated with Earthquakes”, edited by M. Hayakawa, pp. 1-45. Terra Scientific Publishing Company (TERRAPUB), Tokyo, 1999, pp.1-45.
  154. P. Varotsos, and M. Lazaridou, A review of the VAN method, in “Atmospheric and Ionospheric Electromagnetic Phenomena Associated with Earthquakes”, edited by M. Hayakawa, Terra Scientific Publishing Company (TERRAPUB), Tokyo, 1999 pp. 47-51.
  155. P. Varotsos, N. Sarlis, M. Lazaridou, N. Bogris, K. Eftaxias and V. Hadjicontis, A Review on the Statistical Significance of VAN Predictions, Physics and Chemistry of the Earth (A), 24, 2, 111-114, 1999.
  156. P. Varotsos, N. Sarlis, K. Eftaxias, M. Lazaridou, N. Bogris, J. Makris, A. Abdulla and P. Kapiris, Prediction of the 6.6 Grevena-Kozani earthquake of May 13, 1995, Physics and Chemistry of the Earth (A), 24, 2, 115-121, 1999.
  157. P. Varotsos, N. Sarlis, and M. Lazaridou, Interconnection of defect parameters and stress-induced electric signals in ionic crystals, Phys.Rev. B. 59, 24-27, 1999. d19.pdf
  158. N. Sarlis, M. Lazaridou, P. Kapiris, and P. Varotsos, Numerical model of the selectivity effect and the ΔV/L criterion, Geophys. Res. Lett. 26, 3245-3248, 1999. d25.pdf
  159. P. Varotsos, K. Eftaxias, V. Hadjicontis, N. Bogris, E. Skordas, P. Kapiris, and M. Lazaridou, A note on the extent of the SES sensitive area around Lamia (LAM), Greece, Acta Geophys. Pol., 47, 4, 435-439, 1999.
  160. P. Varotsos, K. Eftaxias, V. Hadjicontis, N. Bogris, E. Skordas, P. Kapiris, and M. Lazaridou, A note on the extent of the SES sensitive area around Lamia (LAM), Greece. Continuation I, Acta Geophys. Pol., 47, 4, 441-442, 1999.
  161. P. Varotsos, K. Eftaxias, V. Hadjicontis, N. Bogris, E. Skordas, P. Kapiris, and M. Lazaridou, A note on the extent of the SES sensitive area around Lamia (LAM), Greece. Continuation II, Acta Geophys. Pol., 47, 4, 443-444, 1999.
  162. K. Eftaxias, J. Kopanas, N. Bogris, P. Kapiris, G. Antonopoulos, and P. Varotsos, Detection of electromagnetic earthquake precursory signals in Greece, Proc. Japan Acad. Ser. B, 76, 45-50, 2000.
  163. E. Skordas, P. Kapiris, N. Bogris, and P. Varotsos, Field experimentation on the detectability of co-seismic electric signals, Proc. Japan Acad., Ser. B, 76, 51-56, 2000.
  164. P. Varotsos, N. Sarlis, and M. Lazaridou, Transmission of stress induced electric signals in dielectric media, Part II, Acta Geophys. Pol., 48, 2, 141-177, 2000.
  165. P. Varotsos, N. Sarlis, and E. Skordas, Transmission of stress induced electric signals in dielectric media, Part III, Acta Geophys. Pol., 48, 3, 263-297, 2000.
  166. K. Eftaxias, J. Kopanas, N. Bogris, P. Kapiris, G. Antonopoulos, and P. Varotsos, Detection of electromagnetic earthquake precursory signals in Greece, Proc. Japan. Acad. Ser. B, 76, 45-50, 2000.
  167. A. Kyritsis, M. Siakantari, A. Vasilikou-Dova, P. Pissis, and P. Varotsos, Dielectric and electrical properties of polycrystalline rocks at various hydration levels, IEEE, 7, 493-497, 2000.
  168. A. Kyritsis, M. Siakantari, A. Vasilikou-Dova, P. Pissis, and P. Varotsos, Large low frequency dielectric constant exhibited by hydrated rock materials, Proc. Japan Acad. Ser. B, 77, 19-23, 2001.
  169. P. Varotsos, V. Hadjicontis, and A.S. Nowick, The physical mechanism of Seismic Electric Signals, Acta Geophys. Pol. 49, 415-421, 2001.
  170. P. Varotsos, N.Sarlis, and E. Skordas, A note on the spatial extent of the Volos SES sensitive site, Acta Geophys. Pol. 49, 425-435, 2001. d32.pdf
  171. P. Varotsos, and M. Lazaridou, Thermodynamic of Point Defects. In Earthquake Thermodynamics and Phase Transformation in the Earth’s Interior, (eds. R. Teisseyre and E. Majewski). Academic Press, 231-259, 2001 (Review article).
  172. P. Varotsos, A review and analysis of electromagnetic precursory phenomena, Acta Geophys. Pol. 49, 1, 1-42, 2001 (Review article).
  173. N. Sarlis, and P. Varotsos, Comments on the transmission of electric signals in dielectric media, Acta Geophys. Pol. 49, 3, 277-285, 2001.
  174. P. Varotsos, N. Sarlis, and E. Skordas, Magnetic field variations associated with SES. The instrumentation used for investigating their detectability, Proc. Japan Acad. Ser. B, 77, 87-92, 2001.
  175. P. Varotsos, N. Sarlis, and E. Skordas, Magnetic field variations associated with SES before the 6.6 Grevena-Kozani earhquake, Proc. Japan Acad. Ser. B, 77, 93-97, 2001.
  176. Eftaxias K., I. Rokityansky, N. Bogris, G. Balasis, and P. Varotsos, Magnetovariatonal and Magnetotelluric study of Ioannina region sensitive to Seismic Electric Signals (SES), J. Atmospheric Electricity, 22 (3), 113-137, 2002.
  177. N. Sarlis, and P. Varotsos, Magnetic field near the outcrop of an almost horizontal conductive sheet, J. Geodynamics, 33, 463-476, 2002.
  178. P. Varotsos, N. Sarlis, and E. Skordas, Seismic electric signals and seismicity: On a tentative interrelation between their spectral content, Acta Geophys. Pol. 50, 337-354, 2002. d35.pdf
  179. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, Note on an important SES activity at Ioannina station (IOA), Acta Geophys. Pol. 50, 3, 355-359, 2002.
  180. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Long-range correlations in the electric signals that precede rupture, Phys. Rev. E, 66, 011902 (7), 2002. d37.pdf
  181. P. Varotsos, and N. Sarlis, A review of the recent VAN efforts: the explanation of the SES physical properties, in Seismo-Electromagnetics: Lithosphere-Atmosphere-Ionosphere coupling, eds. M. Hayakawa and O.A. Molchanov, TerraPub., Tokyo, 131-140, 2002.
  182. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Long-range correlations in the electric signals that precede rupture: Further investigations, Phys. Rev. E, 67, 021109 (13), 2003. d38.pdf d38-S.pdf
  183. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, Four notes on SES activity at the Ioannina observatory, Greece, Acta Geophys. Pol. 51,2, 147-153, 2003.
  184. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Attempt to distinguish electric signals of a dichotomous nature, Phys. Rev. E. 68, 031106 (7), 2003. d39.pdf d39-S.pdf
  185. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Electric fields that “arrive” before the time-derivative of the magnetic field prior to major earthquakes, Phys. Rev. Lett., 91, 148501 (4), 2003. d40.pdf d40-S.pdf
  186. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, Determination of the epicentral distance of an impending earthquake from the rise time of Seismic Electric Signals, Studying the Earth from Space,5, 3-5, 2003.
  187. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, The time-difference between the electric and magnetic field variations of Seismic Electric Signals and the Space Techniques, Studying the Earth from Space, 6, 14-17, 2003.
  188. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, SES activity recorded at Keratea (KER) station on April 12, 2003, Acta Geophys. Pol. 52, 45-48, 2004.
  189. P. Varotsos, Fracture and Friction: A Review, Acta Geophys. Pol., 52, 2, 105-142, 2004.
  190. P. Varotsos, N. Sarlis, and E. Skordas, On the difference in the rise times of the two SES electric field components, Proc. Japan Acad., Ser. B, 80, 6, 276-282, 2004.
  191. H. Tanaka, P. Varotsos, N. Sarlis, and E. Skordas, A plausible universal behavior of earthquakes in the natural time-domain, Proc. Japan Acad. Ser. B, 80, 6, 283-289, 2004. d47.pdf
  192. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and M.S. Lazaridou, Entropy in the natural time-domain, Phys. Rev. E, 70, 011106(10), 2004. d45.pdf
  193. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and H.K. Tanaka, A plausible explanation of the b-value in the Gutenberg-Richter law from First Principles, Proc. Japan Acad. Ser. B, 80, 9, 429-434, 2004. d48.pdf
  194. R. Teisseyre, P. Varotsos, and C. Rozluchi, Electromagnetic excitation and seismicity in the natural time-domain: Stimulations with a theoretical model, Acta Geophys. Pol. 52, 477-496, 2004.
  195. I. Rokityansky, P. Varotsos, and N. Sarlis, Comment on “Electrical conductivity and crustal structure beneath the central Hellenides around the Gulf of Corinth (Greece) and their relationship with the seismotectonics, Pham et al., 2000, Geophys. J. Int. 142, 948-969”, Geophys. J. Int. 162, 332-336, 2005. d54.pdf
  196. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and M.S. Lazaridou, Natural entropy fluctuations discriminate similar looking electric signals emitted from systems of different dynamics, Phys. Rev. E 71, 011110(11), 2005. d49.pdf d49-S.pdf
  197. P.A. Varotsos, N.V. Sarlis, H.K. Tanaka and E.S. Skordas, Some properties of the entropy in the natural time, Phys. Rev. E, 71, 032102(4), 2005. d50.pdf d50-S.pdf
  198. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Time diference between the electric field components prior to major earthquakes, Appl. Phys. Lett. 86, 194101(3), 2005. d52.pdf d52-S.pdf
  199. S. Abe, N.V. Sarlis, E.S. Skordas, H.K. Tanaka and P.A. Varotsos, Origin of the usefulness of the natural time representation of complex time series, Phys. Rev. Lett. 94, 170601(4), 2005. d51.pdf
  200. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, H.K. Tanaka, and M.S. Lazaridou, Additional evidence on some relationship between Seismic Electric Signals and earthquake source parameters, Acta Geophys. Pol. 53, 3, 293-298, 2005.
  201. P.A. Varotsos, N.V. Sarlis, H.K. Tanaka and E.S. Skordas, Similarity of fluctuations in correlated systems: The case of seismicity, Phys. Rev. E 72, 041103(8), 2005. d55.pdf d55-S.pdf
  202. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, Additional evidence on some relationship between Seismic Electric Signals (SES) and earthquake focal mechanism, Tectonophysics 412, 279-288, 2006. d56.pdf
  203. P. Varotsos, and M. Lazaridou, A Review on Friction. In “Earthquake Source Assymetry, Structural Media and Rotation Effects” (Editors: R. Teisseyre, M. Takeo and E. Majewski), Springer, Heildelberg, 2006, Ch. 9, pp. 91-111.
  204. P. Varotsos, N. Sarlis, and E. Skordas, On the recent advances in the study of Seismic Electric Signals (VAN method), Physics and Chemistry of the Earth (A) 31, 189-197, 2006 .
  205. I. Rokityanski, and P. Varotsos, Magnetotelluric data collection and analysis in the SES sensitive site of Ioannina area, Greece, Physics and Chemistry of the Earth (A) 31, 198-203, 2006.
  206. N.V. Sarlis, P.A. Varotsos, and E.S. Skordas, Flux avalanches in YBa2Cu3O7-x films and rice piles: Natural time domain analysis, Phys. Rev. B, 73, 054504 (7), 2006. d57.pdf
  207. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, H.K. Tanaka, and M.S. Lazaridou, Entropy of seismic electric signals: Analysis in natural time under time reversal, Phys. Rev. E, 73, 031114 (8), 2006. d58.pdf d58-S1.pdf d58-S2.pdf
  208. P.A. Varotsos, What happened before the last five strong earthquakes in Greece, Proc. Jpn. Acad. Ser. B, 82, 86-91, 2006. JAC82_2006.pdf
  209. P.A. Varotsos, Recent Seismic Electric Signals (SES) in Greece, Acta Geophysica (Springer-Verlag) 54, No2, 158-164, 2006.
  210. P.A. Varotsos, Recent Seismic Electric Signals (SES) activities in Greece, Acta Geophysica (Springer-Verlag) 54, No 2, (2006), 158-164. Acta2006.pdf
  211. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, H.K. Tanaka and M.S. Lazaridou, Attempt to distinguish long-range temporal correlations from the statistics of the increments by natural time analysis, Phys. Rev. E, 74, 021123(12), 2006. d60.pdf d60-S1.pdf d60-S2.pdf
  212. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and M.S. Lazaridou, Electric pulses some minutes before earthquake occurrences, Appl. Phys. Lett. 90, 064104(3), 2007. d62.pdf d62-S.pdf
  213. P. Varotsos, Self-diffusion in sodium under pressure revisited, J. Phys.: Condens. Matter 19, 176231(5), 2007.
  214. P. Varotsos, Calculation of point defect parameters in diamond, Phys. Rev. B 75, 172107(3), 2007.
  215. P. Varotsos, Comparison of models that interconnect point defect parameters in solids with bulk properties, J. Appl. Phys. 101, 123503(8), 2007.
  216. P. Varotsos, Defect volumes and the equation of state in α-PbF2, Phys. Rev. B 76, 092106(4), 2007.
  217. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and M.S. Lazaridou, Identifying sudden cardiac death risk and specifying its occurrence time by analyzing electrocardiograms in natural time, Appl. Phys. Lett. 91, 064106(3), 2007. d63.pdf  d63-appendix1.pdf  d63-appendix2.pdf  d63-appendix3.pdf  d63-appendix4.pdf  d63-table1.pdf  d63-table2.pdf
  218. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and M.S. Lazaridou, Fluctuations, under time reversal, of the natural time and the entropy distinguish similar looking electric signals of different dynamics, J. Appl. Phys. 103, 014906 (2008). d64.pdf
  219. P. Varotsos, Point defect parameters in b-PbF2 revisited, Solid State Ionics 179, 438-441 (2008).
  220. P. Varotsos and S. Uyeda, Comments on “Seismomagnetic Effects from the Long-Avaited 28 September 2004 M 6.0 Parkfield Earthquake”, by M.J.S. Johnston, Y. Sasai, G.D. Egberg, and R.J. Mueller, Bulletin of the Seismological Society of America 98, 2087-2089 (2008).
  221. N.V. Sarlis, E.S. Skordas, M.S. Lazaridou, and P.A. Varotsos, Investigation of the seismicity after the initiation of a Seismic Electric Signal activity until the main shock, Proceedings of the Japan Academy, Ser. Β, 84, 331-343, 2008. d65.pdf
  222. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Detrended fluctuation analysis of the magnetic and electric field variations that precede rupture, CHAOS 19, 023114(8), 2009. chaos2009.pdf
  223. P. Varotsos, The importance of anharmonic effects in models that interconnect point defect parameters with bulk properties in solids, J. Appl. Phys. 105, 083524 (4), 2009.
  224. N.V. Sarlis, E.S. Skordas and P.A. Varotsos, Heart rate variability in natural time and 1/f «noise», EuroPhysics Letters EPL, 87, 18003, (2009). d67.pdf
  225. N.V. Sarlis, E.S. Skordas, and P.A. Varotsos, Multiplicative cascades and seismicity in natural time, Physical Review E 80, 022102, (2009). d68.pdf and Supplementary information for the Brief Report d68-s.pdf
  226. E.S. Skordas, N.V. Sarlis and P.A. Varotsos Title: Effect of significant data loss on identifying electric signals that precede rupture estimated by detrended fluctuation analysis in natural time, CHAOS 20, 033111 (2010). chaos_20_033111.pdf
  227. N.V. Sarlis, E.S. Skordas and P.A. Varotsos, Order parameter fluctuations of seismicity in natural time before and after mainshocks EPL 91, 59001 (2010). epl91_59001.pdf
  228. N.V. Sarlis, E.S. Skordas and P.A. Varotsos, Nonextensivity and natural time: The case of seismicity, Phys. Rev. E 82, 021110 (2010). PhysRevE.82.021110.pdf
  229. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, S. Uyeda and M. Kamogawa, Natural-time analysis of critical phenomena: The case of seismicity, EPL 92 (2010) 29002. epl13025.pdf
  230. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, On identifying long-range correlated signals upon significant periodic data loss Tectonophysics 503 (2011) 189-194. d69.pdf
  231. Panayiotis Varotsos, Nicholas V. Sarlis, Efthimios S. Skordas, Seiya Uyeda, and Masashi Kamogawa, Natural time analysis of critical phenomena, Proc Natl Acad Sci USA 108 (2011) 11361-11364. d70.pdf
  232. N.V. Sarlis, E.S. Skordas, and P.A. Varotsos, Similarity of fluctuations in systems exhibiting Self-Organized Criticality, EPL 96 (2011) 28006. d71.pdf
  233. N.V. Sarlis, E.S. Skordas, and P.A. Varotsos, The change of the entropy in natural time under time-reversal in the Olami-Feder-Christensen earthquake model Tectonophysics 513 (2011), 49-53. d72.pdf
  234. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, Scale-specific order parameter fluctuations of seismicity in natural time before mainshocks, EPL 96 (2011), 59002. d73.pdf
  235. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, Scale-specific order parameter fluctuations of seismicity before mainshocks: Natural time and Detrended Fluctuation Analysis, EPL 99 (2012), 59001(6). d74.pdf
  236. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, Remarkable changes in the distribution of the order parameter of seismicity before mainshocks, Europhysics Letters EPL 100 (2012), 39002(6). d75.pdf
  237. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, Order parameter fluctuations in natural time and b-value variation before large earthquakes, Nat. Hazards Earth Syst. Sci. 12 (2012) 3473-3481. d76.pdf
  238. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and M. S. Lazaridou, “Seismic Electric Signals: An additional fact showing their physical interconnection with seismicity” Tectonophysics 589 (2013) 116-125. tecto2013.pdf
  239. Nicholas V. Sarlis, Efthimios S. Skordas, Panayiotis A. Varotsos, Toshiyasu Nagao, Masashi Kamogawa, Haruo Tanaka, and Seiya Uyeda. Minimum of the order parameter fluctuations of seismicity before major earthquakes in Japan, Proc Natl Acad Sci USA 110 (2013) 13734-13738. pnas110_13734.pdf
  240. N.V. Sarlis, E.S. Skordas, S.-R. G. Christopoulos, and P.A. Varotsos “Statistical Significance of Minimum of the Order Parameter Fluctuations of Seismicity Before Major Earthquakes in Japan ”, Pure Appl. Geophys. 173 (2016), 165–172. pureapplgeophys2016.pdf
  241. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas. “Study of the temporal correlations in the magnitude time series before major earthquakes in Japan” J. Geophys. Res. Space Physics 119 (2014), 9192-9206. jgr2014.pdf
  242. Nicholas V. Sarlis, Efthimios S. Skordas, Panayiotis A. Varotsos, Toshiyasu Nagao, Masashi Kamogawa, and Seiya Uyeda “Spatiotemporal variations of seismicity before major earthquakes in the Japanese area and their relation with the epicentral locations”, Proceedings of the National Academy of Sciences of the United States of America 112 (2015), 986-989. pnas2015.pdf & commentary.pdf
  243. Panayiotis A. Varotsos, Nicholas V. Sarlis, Efthimios S. Skordas, Stavros-Richard G. Christopoulos, Mary S. Lazaridou-Varotsos, “Identifying the occurrence time of an impending mainshock: a very recent case”, Earthq. Sci. 28 (2015), 215–222. earthsci-2015.pdf
  244. Panayiotis A. Varotsos, Nicholas V. Sarlis, Efthimios S. Skordas, “On the motivation and foundation of Natural Time Analysis: Useful remarks”, Acta Geophysica 64 (2016), 841-852. actageophysica2016.pdf
  245. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, “Identifying the occurrence time of an impending major earthquake: a review”, Earthq. Sci. 30 (2017), 209–218. EqSci_30_2017_209.pdf
  246. P.A. Varotsos, N.V. Sarlis, E.S. Skordas and M.S. Lazaridou-Varotsos, “MW9 Tohoku earthquake in 2011 in Japan: precursors uncovered by natural time analysis”, Earthq. Sci. 30 (2017), 183–191. EqSci_30_2017_183.pdf
  247. N.V. Sarlis, P.A. Varotsos, E.S. Skordas, Seiya Uyeda, Jacques Zlotnicki, Toshiyasu Nagao, Anatoly Rybin, M.S. Lazaridou-Varotsos, Konstantina A. Papadopoulou, “Seismic electric signals in seismic prone areas”, Earthq. Sci. 31 (2018), 44–51. SESinSeimicProneAreas-EMSEV-RAS.pdf
  248. A. Ramírez-Rojas, E. L. Flores-Márquez, N.V. Sarlis and P.A. Varotsos, “The Complexity Measures Associated with the Fluctuations of the Entropy in Natural Time before the Deadly México M8.2 Earthquake on 7 September 2017”, Entropy 20 (2018), 477. entropy-20-00477-1.pdf
  249. N.V. Sarlis, E.S. Skordas P.A. Varotsos, A. Ramírez-Rojas, E. L. Flores-Márquez, “Natural time analysis: On the deadly Mexico M8.2 earthquake on 7 September 2017”, Physica A 506 (2018), 625-634. PhysicaA2018.pdf
  250. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, “Tsallis Entropy Index q and the Complexity Measure of Seismicity in Natural Time under Time Reversal before the M9 Tohoku Earthquake in 2011 “Entropy 20 (2018), 757. entropy-20-00757.pdf
  251. N.V. Sarlis, E.S. Skordas, and P.A. Varotsos, “A remarkable change of the entropy of seismicity in natural time under time reversal before the super-giant M9 Tohoku earthquake on 11 March 2011”, Europhysics Letters (EPL), Vol. 124 (2018), 29001. d93_2018_EPL_124_29001.pdf, d93-SM1.pdf, d93-SM2.pdf
  252. N.V. Sarlis, E.S. Skordas P.A. Varotsos, A. Ramírez-Rojas, E. L. Flores-Márquez, “Investigation of the temporal correlations between earthquake magnitudes before the Mexico M8.2 earthquake on 7 September 2017”, Physica A 517 (2019), 475-483. PhysicaA_Mexico-DFA_2019.pdf
  253. N.V. Sarlis, E.S. Skordas P.A. Varotsos, A. Ramírez-Rojas, E. L. Flores-Márquez, “Identifying the Occurrence Time of the Deadly Mexico M8.2 Earthquake on 7 September 2017”, Entropy 21 (2019), 301. entropy-21-00301.pdf
  254. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, “Natural time analysis: Important changes of the order parameter of seismicity preceding the 2011 M9 Tohoku earthquake in Japan”, Europhysics Letters (EPL), Vol. 125 (2019), 69001. EPL125-2019-69001.pdf
  255. P.A. Varotsos, N.V. Sarlis and E.S. Skordas, “Phenomena preceding major earthquakes interconnected through a physical model”, Annales Geophysicae 37 (2019), 315–324. angeo-37-315-2019.pdf
  256. G. Baldoumas, D. Peschos, G. Tatsis, S.K. Chronopoulos, V. Christofilakis, P. Kostarakis, P. Varotsos, N.V. Sarlis, E.S. Skordas, A. Bechlioulis, L.K. Michalis and K.K. Naka, “A Prototype Photoplethysmography Electronic Device that Distinguishes Congestive Heart Failure from Healthy Individuals by Applying Natural Time Analysis”, Electronics 8 (2019), 1288; doi:10.3390/electronics8111288. electronics-08-01288.pdf
  257. E S. Skordas, N. V. Sarlis and P. A. Varotsos, “Identifying the occurrence time of an impending major earthquake by means of the fluctuations of the entropy change under time reversal”, Europhysics Letters (EPL), Vol. 128 (2019), 49001; doi: 10.1209/0295-5075/128/49001. epl19927.pdf
  258. N.V. Sarlis, E.S. Skordas, and P.A. Varotsos, Natural Time Analysis: Results Related to Two Earthquakes in Greece during 2019, Proceedings, Proceedings, Vol. 24, 20; doi:10.3390/IECG2019-06194. proceedings-24-00020-v2.pdf
  259. E S. Skordas, N. V. Sarlis and P. A. Varotsos, “Precursory variations of Tsallis non-extensive statistical mechanics entropic index associated with the M9 Tohoku earthquake in 2011”, Eur. Phys. J. Special Topics, Vol. 229 (2020), 851-859; doi: 10.1140/epjst/e2020-900218-x. d104.pdf
  260. P. A. Varotsos, E S. Skordas and N. V. Sarlis, “Fluctuations of the entropy change under time reversal: Further investigations on identifying the occurrence time of an impending major earthquake”, Europhysics Letters (EPL), Vol. 130 (2020), 29001; doi: 10.1209/0295-5075/130/29001. d105.pdf & supplementarymaterial.pdf
  261. N. V. Sarlis, E. S. Skordas, S.-R. G. Christopoulos and P.A. Varotsos, “Natural Time Analysis: The Area under the Receiver Operating Characteristic Curve of the Order Parameter Fluctuations Minima Preceding Major Earthquakes” Entropy, Vol. 22 (2020), 583; doi 10.3390/e22050583. d106.pdf
  262. E. L. Flores-Márquez, A. Ramírez-Rojas , J. Perez-Oregon, N. V. Sarlis,E. S. Skordas and P. A. Varotsos, “Natural Time Analysis of Seismicity within the Mexican Flat Slab before the M7.1 Earthquake on 19 September, 2017” Entropy, Vol. 22 (2020), 730, doi:10.3390/e22070730. d107.pdf
  263. P. A. Varotsos, N. V. Sarlis and E S. Skordas, “Self-organized criticality and earthquake predictability: A long-standing question in the light of natural time analysis”, Europhysics Letters (EPL), Vol. 132 (2020), 29001; doi: 10.1209/0295-5075/132/29001 epl132_29001-perspective.pdf
  264. E S. Skordas, N. V. Sarlis and P. A. Varotsos, “Applying the cBΩ thermodynamical model to LiF using its equation of state obtained from high pressure diamond anvil cell measurements”, Solid State Ionics, Vol. 354 (2020), 115404; doi 10.1016/j.ssi.2020.115404. d108.pdf
  265. G. Baldoumas , D. Peschos , G. Tatsis , V. Christofilakis , S. K. Chronopoulos ,P. Kostarakis , P. A. Varotsos , N. V. Sarlis , E. S. Skordas , A. Bechlioulis , L. K. Michalis & K. K. Naka, “Remote sensing natural time analysis of heartbeat data by means of a portable photoplethysmography device”, International Journal of Remote Sensing, 42:6 (2021), 2292-2302, DOI: 10.1080/2150704X.2020.1847351. d110.pdf
  266. P. A. Varotsos, N. V. Sarlis, E S. Skordas, Toshiyasu Nagao, and Masashi Kamogawa, “The unusual case of the ultra-deep 2015 Ogasawara earthquake (MW7.9): Natural time analysis”, Europhysics Letters (EPL), Vol. 135 (2021), 49002; doi: 10.1209/0295-5075/135/49002. d111.pdf
  267. P. A. Varotsos, N. V. Sarlis, E S. Skordas, “Thermodynamics of Point Defects in Solids and Relation with the Bulk Properties: Recent Results”, Crystals, Vol. 12 (2022), 686, Doi: 10.3390/cryst12050686. d114.pdf
  268. P. A. Varotsos, N. V. Sarlis, E S. Skordas, “Order Parameter and Entropy of Seismicity in Natural Time before Major Earthquakes: Recent Results”, Geosciences, Vol. 12 (2022), 225, DOI: 10.3390/geosciences12060225. d115.pdf
  269. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, Toshiyasu Nagao, Masashi Kamogawa, “Natural time analysis together with non-extensive statistical mechanics shorten the time window of the impending 2011 Tohoku M9 earthquake in Japan”, Communications in Nonlinear Science and Numerical Simulation, Vol. 125 (2023) 107370. doi:10.1016/j.cnsns.2023.107370 d156.pdf
  270. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, Toshiyasu Nagao, Masashi Kamogawa, E.L. Flores-Márquez, A. Ramírez-Rojas, J. Perez-Oregon, “Improving the Estimation of the Occurrence Time of an Impending Major Earthquake Using the Entropy Change of Seismicity in Natural Time Analysis". Geosciences, Vol. 13 (2023) 222. doi:10.3390/ geosciences13080222 geosciences-13-00222-v2.pdf
  271. Jiyan Xue, Sihong Wu, Qinghua Huang, Li Zhao, Nicholas V Sarlis, and Panayiotis A Varotsos, “RASE: A Real-time Automatic Search Engine for Anomalous Seismic Electric Signals in Geoelectric Data”, IEEE Transactions on Geoscience and Remote Sensing, Vol. 61 (2023) 5905911 d155.pdf
  272. G. Tatsis, G. Baldoumas, V. Christofilakis, P. Kostarakis, P.A. Varotsos, N.V. Sarlis, E.S. Skordas, A. Bechlioulis, L.K. Michalis, K.K. Naka, “A new e-health cloud-based system for cardiovascular risk assessment”, Frontiers in Electronics, Vol. 4 (2023) 1315132 d159.pdf
  273. P.A. Varotsos , N.V. Sarlis and E.S. Skordas, “Direct interconnection of seismicity with variations of the Earth’s electric and magnetic field before major earthquakes”, Europhysics Letters (EPL), Vol. 146 (2024), 22001; doi: 10.1209/0295-5075/ad37d6 epl-2024.pdf

II. Additional Publications (non-peer-reviewed) by P. Varotsos et al.
(mainly Practica Athens Academy)

  1. P. Varotsos, Dielectric loss of alkali halides doped with divalent cations, PhD Thesis, Athens University, 1973.
  2. P. Varotsos and D. Miliotis, Divalent cations in rocksaltand CsCl type structure, Technical report 6, University of Ioannina, July 1973.
  3. P. Varotsos, X-ray study of LiD crystal, Dozentur Thesis (Διατριβή επί Υφηγεσία), University of Athens, 1976.
  4. K. Alexopoulos and P. Varotsos, A connection between fusion and vacancies, Indian Association for the Cultivation of Science (Gadavpur, Calcuta) January 1977.
  5. P. Varotsos, K. Alexopoulos and K. Nomicos, Seismic electric currents, Practica Athens Academy 56, 277-286, 1981.
  6. P. Varotsos, K. Alexopoulos and K. Nomicos, Seven hour precursors to earthquake determined from telluric currents, Practica Athens Academy 56, 417-433, 1981.
  7. P. Varotsos, K. Alexopoulos, K. Nomicos, G. Papaioannou, M. Lazaridou and E. Dologlou, Determination of the epicenter of impending earthquakes from precursor changes of the telluric current, Practica Athens Academy 56, 434-446, 1981.
  8. P. Varotsos, K. Alexopoulos, K. Nomicos, G. Papaioannou, M. Lazaridou and E. Dologlou, Determination of the epicenter of an earthquake, Practica Athens Academy 57, 364-371, 1982.
  9. P. Varotsos, K. Alexopoulos and K. Nomicos, Electrotelluric precursors to earthquakes, Practica Athens Academy 57, 341-363, 1982.
  10. P. Varotsos, K. Alexopoulos, K. Nomicos, E. Dologlou-Revelioti, and M. Lazaridou-Varotsou, Parameters of the electrotelluric precursors to earthquakes of Kefallinia, Practica Athens Academy 58, 250-257, 1983.
  11. P. Varotsos and K. Alexopoulos, Physical properties of the variations of the electric field of the earth preceding earthquakes, Practica Athens Academy 59, 51-116, 1984.
  12. P. Varotsos, K. Alexopoulos, K. Nomicos and M. Lazaridou, On the contribution of selectivity to the prediction of earthquake epicenters, Practica of Athens Academy 61, 12, 1986.
  13. E. Dologlou, K. Eftaxias, V. Hadjikontis, A. Androutsopoulou and P. Varotsos, The installation of a new seismic network in Greece for test ban monitoring, Proceedings of the Conference on Nuclear TestBan Verification (Linkoping, Sweden, May 17-19, 1988; invited paper).
  14. P. Varotsos, Review on Seismic Electric Signals, in “Sono prevedibili, terremoti e le eruzioni vulcaniche”, Protezione Civile Publicazione 17, 81-84 1989.
  15. P. Varotsos, K. Alexopoulos, K. Nomicos and M. Lazaridou, Earthquake Prediction in Greece from Seismic Electric Signals: Period January 1, 1987 - June 30, 1989, Practica of Athens Academy 64, 514-523, 1990.
  16. P. Varotsos, K. Alexopoulos and M. Lazaridou, Short term earthquake prediction from measurements of the electric field of the earth, Invited paper in “The Seminaire de Formation Avancee sur les Problemes de l' Interdisciplinarite”. Etude de cas: la prevision des seismes (Delphes, 25-27, Mars 1990). [Publications de la Sorbonne 1996]
  17. P. Varotsos and M. Lazaridou, Earthquake Prediction in Greece by VAN-method, in “International Seminar on Earthquake Prediction and Hazard Mitigation Technology”, Edited by Science and Technology Agency (Tsukuba, Japan) pp. 307-322, 1991 (Invited Paper).
  18. P. Varotsos, K. Alexopoulos and M. Lazaridou, Comments on the recent seismic electric signal activity in Greece, in “International Seminar on Earthquake Prediction and Hazard Mitigation Technology”, Edited by Science and Technology Agency (Tsukuba, Japan) pp. 323-331, 1991 (Invited Paper).
  19. P. Varotsos, K. Alexopoulos, K. Nomicos and M. Lazaridou-Varotsou, Prediction of 5.7 Richter earthquake of January 23, 1992, Practica of Athens Academy 67, 213-219, 1992.
  20. P. Varotsos, K. Alexopoulos, K. Eftaxias and M. Lazaridou, Basic principles for evaluating an earthquake prediction method, Practica of Athens Academy 68, 306-316, 1993.
  21. P. Varotsos and M. Lazaridou, Earthquake prediction in Greece based on Seismic Electric Signals, Invited talk on the workshop on Emergency Management, Ispra (June 23-24, 1992), EUR 14953 EN, 15-32, 1993.
  22. J. Kopanas, K. Eftaxias, G. Antonopoulos, J. Makris, M. Lazaridou and P. Varotsos, Short Term Earthquake Prediction in Greece by detecting Seismic Electric Signals, in “Electromagnetic Compatibility”, EMC12-16, Poland, 1994.
  23. P. Varotsos, K. Eftaxias, M. Lazaridou, G. Antonopoulos and J. Makris, Greek version of Earthquake Prediction. Truth about Prediction by Geo-electric Current, GeoMonitor 4, (8), 12, 1994.
  24. P. Varotsos, Reply to News Notes, GeoMonitor 5, 3-4, 1995.
  25. P. Varotsos, N. Sarlis, M. Lazaridou and P. Kapiris, A plausible model for the explanation of the selectivity effect of Seismic Electric Signals, Practica of Athens Academy 71, 283-354, 1996.
  26. P. Varotsos, N. Sarlis, M. Lazaridou, and P. Kapiris, Transmission mechanism of Seismic Electric Signals. II, Practica of Athens Academy 72, 270-302, 1997.
  27. M. Lazaridou, N. Sarlis, P. Varotsos, and P. Kapiris, On the physical basis of the DV/L-criterion for the discrimination of electrical precursors from artificial noise, EOS 78, S210, 1997 (Extended abstract).
  28. P. Varotsos, N. Sarlis, and E. Skordas, Spatiotemporal complexity aspects on the interrelation between Seismic Electric Signals and seismicity, Practica of Athens Academy, 76, 294-321, 2001. P3.pdf
  29. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, A real-time application of spatio-temporal complexity aspects to a recent electric disturbance recorded at Ioannina, Practica of Athens Academy, 77, 111-117, 2002.
  30. P. Varotsos, N. Sarlis, E. Skordas, and M. Lazaridou, The use of the entropy in the natural time-domain to distinguish electric signals, Practica of Athens Academy 78, 281-298, 2003.
  31. N. Sarlis, E. Skordas, and P. Varotsos, A review of the current understanding of the physical properties of SES, In Routledge IDNDR volume, 2004 (in press).
  32. S. Abe, U. Tirnakli, and P.A. Varotsos, Complexity of seismicity and nonextensive statistics, Europhysics news 36, Nr 6, 206-208, 2005.
  33. P. Varotsos, N. Sarlis, and E. Skordas, Shortening the Time Window of an impending Earthquake by analyzing the Seismic Electric Signals and the subsequent seismicity in the Natural Time Domain (Ispra 2005).
  34. P.A. Varotsos, Is time continuous? arXiv: cond-mat/0605456 (2006, May 18). 0605456v1.pdf
  35. P.A. Varotsos, N.V. Sarlis, E.S. Skordas, and M.S. Lazaridou, Recent Progress in the VAN Method: Analysis in Natural Time, in “Electromagnetic Phenomena Related to Earthquakes and Volcanoes”, Narosa pub. Co. (Ed. Birbal Singh), pp. 169-184, New Delhi (2007)
  36. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Seismic Electric Signals and 1/f “noise” in natural time, cond-mat/arXiv:0711.3766v1, (23 Nov. 2007). 0711.3766v1.pdf
  37. P.A. Varotsos, N.V. Sarlis, and E.S. Skordas, Seismic Electric Signals and 1/f “noise” in natural time, cond-mat/arXiv:0711.3766v3, (1 Feb. 2008). 0711.3766v3.pdf
  38. N.V. Sarlis, E.S. Skordas, M.S. Lazaridou, and P.A. Varotsos, Investigation of the seismicity after the initiation of a Seismic Electric Signal activity until the main shock, cond-mat/arXiv:0802.3329v4, (29 May 2008). 0802.3329v4.pdf
  39. P.A. Varotsos, N. V. Sarlis, E. S. Skordas and M. S. Lazaridou-Varotsos, “Identifying the occurrence time of an impending mainshock: a very recent case”, arXiv: 1908.00279v2 [physics.geo-ph] 1908.00279.pdf

III. Books by P.A. Varotsos

  1. K. Alexopoulos, P. Varotsos, and D. Marinos, General Exercises in Physics, Vasilaki Editions (1978) 335 pages, in Greek.
  2. P. Varotsos and K. Alexopoulos, Thermodynamics of Point Defects and their relation with the bulk properties, Eds. S. Amelinckx, R. Gevers, and J. Nihoul, North Holland (1986) 474 pages.
  3. P. Varotsos and K. Alexopoulos, Solid State Physics, Savalas Editions (1994) 384 pages, in Greek.
  4. P. Varotsos, The Physics of Seismic Electric Signals, TerraPub, Tokyo (2005) 338 pages.
  5. Varotsos P.A., Sarlis N.V. and Skordas E.S., Natural Time Analysis: The new view of time. Precursory Seismic Electric Signals, Earthquakes and other Complex Time-Series (Springer-Verlag, Berlin Heidelberg) 2011. Link
  6. Varotsos P.A., Sarlis N.V. and Skordas E.S., Natural Time Analysis: The new view of time. Part II. Advances in Disaster Predictions using Complex Systems (Springer-Verlag, Berlin Heidelberg) 2023. ISBN 978-3-031-26005-6. Link