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Comparison of simultaneous variations of the ionospheric total electron content and geomagnetic field associated with strong earthquakes
1Dept. of Geophysics and Planetary Sciences, Tel-Aviv University, PO Box 39040, Ramat Aviv, Israel
2Dept. of Electronic Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan
3Central National De La Recherche Scientifique, Universite De Nice-Sophia Antipolis, Geosciences Azur, Valbone, France
Abstract. In this paper, perturbations of the ionospheric Total Electron Content (TEC) are compared with geomagnetic oscillations. Comparison is made for a few selected periods, some during earthquakes in California and Japan and others at quiet periods in Israel and California. Anomalies in TEC were extracted using Global Positioning System (GPS) observations collected by GIL (GPS in Israel) and the California permanent GPS networks. Geomagnetic data were collected in some regions where geomagnetic observatories and the GPS network overlaps. Sensitivity of the GPS method and basic wave characteristics of the ionospheric TEC perturbations are discussed. We study temporal variations of ionospheric TEC structures with highest reasonable spatial resolution around 50 km. Our results show no detectable TEC disturbances caused by right-lateral strike-slip earthquakes with minor vertical displacement. However, geomagnetic observations obtained at two observatories located in the epicenter zone of a strong dip-slip earthquake (Kyuchu, M = 6.2, 26 March 1997) revealed geomagnetic disturbances occurred 6–7 h before the earthquake.
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Citation: Naaman, Sh., Alperovich, L. S., Wdowinski, Sh., Hayakawa, M., and Calais, E.: Comparison of simultaneous variations of the ionospheric total electron content and geomagnetic field associated with strong earthquakes, Nat. Hazards Earth Syst. Sci., 1, 53-59, 2001. Bibtex EndNote Reference Manager
