地震孕育过程中地下磁化率结构的变化分析  

Analysis of the Variation of Underground Magnetic Susceptibility Structure during the Seismogenic Process

作　　者：倪喆[1] 陈斌[2] 崔兴平 顾健 尤伟[1] 徐增明 NI Zhe CHEN Bin CUI Xingping GU Jian YOU Wei XU Zengming(Yunnan Earthquake Agency, Kunming 650224, Yunnan, China Institute of Geophysics, China Earthquake Administration, Beijing 100081, China)

机构地区：[1]云南省地震局,云南昆明650224 [2]中国地震局地球物理研究所,北京100081

出　　处：《地震研究》2017年第3期382-387,共6页Journal of Seismological Research

基　　金：2014年度中国地震局"三结合"课题(142503);2012年度中央级公益性科研院所基本科研业务专项<川滇菱形地块北端地下磁化率结构研究>(DQJB12C11)共同资助

摘　　要：以2013年3月3日云南洱源M5.5地震为对象,研究地震孕震过程中地下介质的磁化率变化,分析其发震前的显著变化特征,为地震预测寻找磁学的短期预测指标。应用Model Vision软件,反演了2011—2013年6期滇西地磁场总强度测网中4条测线的地下磁化率结构及其变化。结果表明:在维西—乔后与无量山断裂之间,磁化率在深度10~15 km和15~20 km同时减小,之后仅在深度15~20 km转为增大,之后发生洱源地震。The subject of this paper is based on the March 3, 2013 Eryuan M5.5 earthquake occurred in Yunnan. We study on the variation characteristic of underground medium magnetic susceptibility during the seismogenic process, and we analyze the significant change characteristic before the Eryuan earthquake. This study searches short term prediction index of magnetism for earthquake prediction. We apply the ModelVision software to invert the underground magnetic susceptibility structure and its variations of 4 survey lines in the magnetic field total in- tensity network in the western Yunnan during the 6 periods from 2011 to 2013. The results show that the magnetic susceptibility decreases in the depth of 10 - 15 km and 15 -20 km simultaneously, after that it only becomes in- crease in the depth of 15 -20 krn. Meanwhile, the Eryuan earthquake took place.

关 键 词：磁化率 地震预测 洱源地震 

分 类 号：P318[天文地球—固体地球物理学]