Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 10 3 2010 10.5194/nhess-10-459-2010 http://www.nat-hazards-earth-syst-sci.net/10/459/2010/ http://www.nat-hazards-earth-syst-sci.net/10/459/2010/nhess-10-459-2010.html http://www.nat-hazards-earth-syst-sci.net/10/459/2010/nhess-10-459-2010.pdf 459 464 2010-03-15 Possible soil thermal response to seismic activities in Alborz region (Iran) N. Rezapour rezapour@irimo.ir M. Fattahi A. A. Bidokhti The Institute of Geophysics, The University of Tehran, North karegar St., Tehran, Iran Oxford University Center of Environment South Parks Road,Oxford, OX1 3QY, UK In this investigation, relations between the ground's thermal properties and 70 earthquakes with a magnitude >4 Richter in the Alborz region during a period of 12 years (1992 to 2004) were studied. Typical changes of ground temperature, 0.4 °C; thermal diffusivity, 0.028 m2 s−1×10−6 and ground heat flux take place a few hours prior to the earthquakes. The values of thermal diffusivity depend on the ground moisture content, which may change during seismic activities. The analysis of ground heat flux from the epicentre and it's surrounding regions show some anomalous behavior before the earthquakes but with different signs in the areas close to the sea and far away from the sea. The changes of the ground's thermal properties prior to the earthquakes in the Alborz region are attributed to the increase in seismic activities in the epicentre and it's surrounding regions. The anomalous behavior in the ground thermal properties shows great potential in providing early warning of imminent earthquake. Arya, S. P.: Introduction to Micrometeorology: International Geophysics Series, 79, Academic press, 420 pp., 2001. Buntebarth, G., Ishankulive, G. A., and Belikov, V. M.: Anomalous variations of the temperature and out flow rate of groundwater in the Kopetdagh Seismoactive region, Turkmenistan, in: Microtemperature Signals of the Earth' Crust: Papierflieger, edited by: Buntebarth, G., Claausthal-Zellerfeld, Germany, pp. 138–141, 1999. Cervone, G., Singh, R. P., Kafatos, M., and Yu, C.: Wavelet maxima curves of surface latent heat flux anomalies associated with Indian earthquakes, Nat. Hazards Earth Syst. Sci., 5, 87–99, 2005. Darvishzadeh, A.: Geological Of Iran, Sepehr press, Tehran, Iran, 350 pp., 1992. Dey, S. and Singh, R. P.: Surface latent heat flux as an earthquake precursor, Nat. Hazards Earth Syst. Sci., 3, 749–755, 2003. Dey, S., Sarker, S., and Singh, R. P.: Anomalous changes in column water vapor after Gujarat earthquake, Adv. Space Res., 2003. Esposito, E., Pece, R., Porfido, S., and Tranfaglia, G.: Hydrological anomalies connected to earthquakes in southern Apennines (Italy), Nat. Hazards Earth Syst. Sci., 1, 137–144, 2001. Hamza, V. M.: Tectonic leakage of fault bounded aquifers subject to non-isothermal recharge: a mechanism generating thermal: Physics of the Earth and Planetary Interiors, 126, pp. 163–177, 2001. Hayakawa, M., Fujinawa, Y., Evison, F. F., Shapiro, V. A., Varotsos, P., Fraser-Smith, A. C., Molchanov, O. A., Pokhotelov, O. A., Enomoto, Y., and Schloessin, H. H.: What is the future direction of investigation on electromagnetic phenomena related to earthquake prediction, Terra Sci. pub. Comp., Tokyo, 667–677, 1994. Hayakawa, M.: Atmospheric and Ionosphere Electromagnetic Phenomena Associated with Earthquakes, Terra Sci., Publ. Comp., Tokyo, p. 995, 1999. Hayakawa, M., Shvets, A. V., and Shinko Maekawa, S.: Subionospheric LF monitoring of ionospheric perturbations prior to the Tokachi-oki earthquake and a possible mechanism of lithosphere-ionosphere coupling, Phys. Chem. Earth, 29, 617–625, 2004. Iran meteorological organization: www.irimet.net, last access: March 2010. Iran geological organization: www.ngdir.ir, last access: March 2010. Kitagawa, Y., Koizumi, N., and Tsuskuda, T.: Comparison of post-seismic groundwater temperature changes with earthquake-induced volumetric strain release: Yudani hot spring, Japan, Geophys. Res. Lett., 23(22), 3147–3150, 1996. Lutgens, F. K. and Tarbuck, E. J.: Essentials of Geology: Prentice Hall, 480, pp., 1989. Milkis, M. R.: Hydrogeological and hydometeorological precursors of Ashkabad catastrophic earthquake, in: Is USSR Rept.: Earth Sci. (JPRS-USE-84-004) p 56-57 (SEE N84-27177 17-42) Transl. into ENGLISH from Dokl. Akad. Nauk SSSR (Moscow), v. 273, pp. 1091–1094, 1984. Mogi, K., Mochizuki, H., and Kurokawa, Y.: Temperature changes in an artesian spring at Usami in the Izu peninsula (Japan) and their relation to earthquakes, Tectonophysics, 159, 95–108, 1989. Molchanov, O. A., Pokhotelov, O. A., Enomoto, Y., and Schloessin, H. H.: What is the future direction of investigation on electromagnetic phenomena related to earthquake prediction, Terra Sci. pub. Comp., Tokyo, 667–677, 1994. Pulinets, S.: Ionospheric Precursors of Earthquakes; Recent Advances in Theory and Practical Applications, J. Atmos. Solar-Terr. Phys., 65(2003), 1337–1347, 2004. Rynn, S. M. W. and Scholz, C. H.: Seismotectonics of the Arthur's Pass region, South Island, New Zealand, Bull. Seismol. Soc. Am., 89, 1373–1388, 1978. Shimamura, H., Ino, M., Hikawa, H., and Iwasaki, T.: Groundwater micro-temperature in earthquake regions, Pure Appl. Geophys., 122, 933–946, 1985. Shvets, A. V., Hayakawa, M., Molchanov, O. A., and Ando, Y.: A study of ionosphere response to regional seismic activity by VLF radio sounding, Phys. Chem. Earth, 29, 627–637, 2004. Singh, R. P., Bhoi, S., and Sahoo, A. K.: Changes observed on land and ocean after Gujarat earthquake 26 January 2001 using IRS data, Int. J. Remot., 23(16), 3123–3128, 2002. Uyeda, S., Nagao, T., Orihara, Y., Yamaguchi, T., and Takahashi, I.: Geoelectric potential changes: Possible precursors to earthquakes in Japan, Proc. Nat. Acad. Sci., 97, 4561–4566, 2000.