Καθηγητής Παναγιώτης Βαρώτσος, Διευθυντής Εργαστηρίου Φυσικής
Professor Panayiotis Varotsos, Director of Physics Laboratory

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

(Last updated: 16-12-2014)

º Curriculum Vitae in English (including the VAN earthquake prediction method)
º Βιογραφικό σημείωμα στην Ελληνική (περιλαμβάνεται η μέθοδος προβλέψεως σεισμών ΒΑΝ)
  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. Varotsos [New Book]
  4. Selected publications [pdf format]
    (all publications related to the concept of «natural time» are included)

I. List of Publications (refereed) by P. Varotsos et al.

  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.
  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.
  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.
  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.
  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.
  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 DV/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.
  158. N. Sarlis, M. Lazaridou, P. Kapiris, and P. Varotsos, Numerical model of the selectivity effect and the DV/L criterion, Geophys. Res. Lett. 26, 21, 3245-3248, 1999.
  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, 4, 425-435, 2001.
  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, 3, 337-354, 2002.
  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.
  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.
  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.
  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.
  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.
  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.
  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.
  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. 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).
  196. 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.
  197. 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.
  198. 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.
  199. 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.
  200. 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.
  201. 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.
  202. 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.
  203. 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.
  204. 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.
  205. 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 .
  206. 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.
  207. N.V. Sarlis, P.A. Varotsos, and E.S. Skordas, Flux avalances in YBa2Cu3O7-x films and rice piles: Natural time domain analysis, Phys. Rev. B, 73, 054504 (7), 2006.
  208. 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.
  209. P.A. Varotsos, What happened before the last five strong earthquakes in Greece, Proc. Jpn. Acad. Ser. B, 82, 86-91, 2006.
  210. P.A. Varotsos, Recent Seismic Electric Signals (SES) in Greece, Acta Geophysica (Springer-Verlag) 54, No2, 158-164, 2006.
  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.
  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.
  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.
  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).
  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.
  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.
  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).
  225. N.V. Sarlis, E.S. Skordas, and P.A. Varotsos, Multiplicative cascades and seismicity in natural time, Physical Review E 80, 022102, (2009).
  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).
  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).
  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).
  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.
  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.
  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.
  232. N. V. Sarlis, E. S. Skordas, and P. A. Varotsos, Similarity of fluctuations in systems exhibiting Self-Organized Criticality, EPL 96 (2011) 28006.
  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.
  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.
  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).
  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), Vol. 100 (2012), 39002(6).
  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., Vol. 12 (2012) 3473-3481.
  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, Vol. 589 (2013) 116-125.
  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.
  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, DOI 10.1007/s00024-014-0930-8.
  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, Vol. 119, doi: 10.1002/2014JA0205800.

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.
  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. S. Abe, U. Tirnakli, and P.A. Varotsos, Complexity of seismicity and nonextensive statistics, Europhysics news 36, Nr 6, 206-208, 2005.
  32. 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).
  33. P.A. Varotsos, Is time continuous? arXiv: cond-mat/0605456 (2006, May 18).
  34. 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)

III. Books by P. 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

IV. Selected publications in pdf format
(all publications related to the concept of «natural time» are included)