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

作     者：Nina N.Nevedrova Aidisa M.Sanchaa Alexander E.Shalaginov Sergey M.Babushkin 

作者机构：Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the RASNovosibirsk630090Russia Seismological Branch of Geophysical Survey of the Russian Academy of Sciences3 Academician Koptug ave.Novosibirsk630090Russia 

出 版 物：《Geodesy and Geodynamics》 (大地测量与地球动力学（英文版）)

年 卷 期：2019年第10卷第6期

页      面：460-470页

学科分类：0709[理学-地质学] 070801[理学-固体地球物理学] 07[理学] 0707[理学-海洋科学] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：partially supported by projects of Fundamental research (Ministry of Science and Higher Education of Russian Federation)No 0331-2016-0035 Russian Foundation for Fundamental Investigations No 17-05-00654 

主　　题：Transient electromagnetic Resistivity anisotropy coefficient Time-lapse survey Gorny Altai Chuya basin 

摘      要：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.