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Electromagnetic monitoring in the region of seismic activization (on the Gorny Altai (Russia) example)

Geodesy and Geodynamics 2019年第6期10卷 460-470页

作者： Nina N.Nevedrova Aidisa M.Sanchaa Alexander E.Shalaginov Sergey M.Babushkin Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the RAS Novosibirsk630090Russia Seismological Branch of Geophysical Survey of the Russian Academy of Sciences 3 Academician Koptug ave.Novosibirsk630090Russia

Based on the analysis of the field data of nonstationary electromagnetic soundings with different installations,the evolution of the stressed state of the geological massif in the epicentral region of the destructive 2003 M_w7.3 chuya earthquake is investigated in the *** measurements by these methods were executed in a lot of regular points located at two sites of the western part of the chuya basin of Gorny Altai(Russian Federation).The field works have been performed for 13 *** developed a measurement technique using data from the three Transient Electromagnetic Method(TEM)method settings for determination of the resistivity anisotropy *** of the field data is carried out based on the inverse problem solution,and further,taking into account the geological structure and seismological data,variations of true electrophysical characteristics of the cross-section(electrical resistivity and resistivity anisotropy coefficient)are *** to the TEM data acquired in the 1980 s,the geoelectric parameters of rocks in the period of low seismic activity were *** of the results of quantitative interpretation of the modern measurements(2004-2016)with those taken before the chuya event allows tracing a change in the geoelectric parameters of the cross-section in the aftershock period,and on this basis tracking the evolution of the rock massif after the destructive seismic impact.

关键词： Transient electromagnetic Resistivity anisotropy coefficient Time-lapse survey Gorny Altai chuya basin

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