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In this paper, perturbations of the ionospheric To- tal 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) ob- servations collected by GIL (GPS in Israel) and the Califor- nia permanent GPS networks. Geomagnetic data were col- lected in some regions where geomagnetic observatories and the GPS network overlaps. Sensitivity of the GPS method and basic wave characteristics of the ionospheric TEC per- turbations 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 earth- quakes with minor vertical displacement. However, geomag- netic 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 distur- bances occurred 6-7 h before the earthquake.

Comparison of simultaneous variations of the ionospheric total electron content and geomagnetic field associated with strong earthquakes