Formation mechanism of great positive TEC disturbances prior to Wenchuan earthquake on May 12, 2008 |
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| Authors: | MV Klimenko VV Klimenko IE Zakharenkova SA Pulinets B Zhao MN Tsidilina |
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| Institution: | 1. West Department of N.V. Pushkov IZMIRAN RAS, 41, Pobedy Av., 236010 Kaliningrad, Russia;2. Kaliningrad State Technical University, 1, Sovetsky Av., 236000 Kaliningrad, Russia;3. Fedorov Institute of Applied Geophysics, 9, Rostokinskaya Str., 129226 Moscow, Russia;4. Space Research Institute (IKI), 84/32 Profsoyuznaya Str, 117997 Moscow, Russia;5. Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, 19, Bei Tu Cheng Xi Lu Chaoyang District, 100029 Beijing, China;6. AEROCOSMOS Scientific Center for Aerospace Monitoring, 4, Gorokhovsky lane, 105064 Moscow, Russia |
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| Abstract: | The problems of physical explanation and possible mechanisms of the seismo-ionospheric effects formation are under discussion now. There are proposed different mechanisms of such effects, for example, large- and small-scale internal gravity waves (IGWs), atmospheric electric field, electromagnetic fields and emissions. However, the appearance of local large-scale seismo-ionospheric anomalies in Total Electron Content (TEC) is possible to explain only by two mechanisms: an atmospheric electric field and/or small-scale IGWs. In this paper, the simulation results for reproduction of the observed seismo-ionospheric great positive effects in TEC prior to strong Wenchuan earthquake are presented. The obtained results confirm the proposed mechanism of seismo-ionospheric effects formation by the penetration of the seismogenic electric field from the atmosphere into the ionosphere. It is suggested that so great TEC enhancement observed 3 days prior to Wenchuan earthquake could be explained by combined action of seismogenic vertical electric field and IGWs generated by the solar terminator. |
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| Keywords: | Earthquake Seismo-ionospheric effects Electric field Internal gravity waves Numerical modeling |
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