[M-IS08] Interdisciplinary studies on pre-earthquake processes

[MIS08-16] Earth’s crust as a new element of the LAIC model within the Global Electric Circuit concept

★Invited Papers

*Sergey A Pulinets¹, V. Gavrilov², V. Bogdanov³, N. Blaustein⁴ (1.Space Research Institute of the Russian Academy of Sciences, 2.Institute of Volcanology and Seismology, Far-East Branch of the Russian Academy of Sciences, 3.Institute of Cosmophysical Research and Radio Wave Propagation, Far-East Branch of the Russian Academy of Sciences, 4.Ben-Gurion University of the Negev, Israel)

Multiparameter analysis (deep borehole measurements, vertical ionospheric sounding, GPS TEC, meteorological parameters) for several strong (M≧7) earthquake in Kamchatka peninsula area demonstrated the self-organizing process characteristic to the critical stage approaching. The most striking fact was the synchronization of variations of the specific resistivity of the earth crust measured at different depths in several boreholes close to Petropavlovsk-Kamchatsky and night-time positive ionospheric variations several days before the mains shock of strong earthquake. The vertical sounding provided by the "Parus" ionosonde at Paratunka (close to Petropavlovsk-Kamchatsky) in addition to variations similar to GPS TEC demonstrated several features in E-region of the ionosphere which usually interpreted as particle precipitation. Increase of the crust resistivity could be interpreted as the serial resistance added to the resistance of the boundary layer in the Global Electric Circuit (GEC) blocking the vertical fair weather current and leading to generation of the vertical electric field, which through the GEC induced the positive anomaly in the ionosphere. For Zhupanovskoye M7.2 earthquake on 30 January 2016 the increase of the apparent resistivity reached 700%. The sporadic E effects could be interpreted as E-layer delamination stimulated by acoustic gravity waves. This delamination was clearly demonstrated at oblique sounding ionograms before earthquakes in Vrancea zone observation. It is assumed that a joint multiparameter analysis of borehole measurement data and monitoring data of the state of the ionosphere will improve the reliability of determining the start of the final stage of earthquake preparation, since significant changes in ionospheric parameters occur, in general, no more than five days before strong Kamchatka earthquakes.