2014年大同地电阻率NW测向异常分析  

Anomaly analysis of earth resistivity in NW direction at Datong in 2014

作　　者：刘素珍[1,2] 李自红[1,2] 张淑亮[1,2] 殷志刚[2,3] 李宏伟[1,2] 王霞[1,2] 

机构地区：[1]山西省地震局,中国太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,中国山西030025 [3]大同中心地震台,中国山西037006

出　　处：《地震地磁观测与研究》2016年第2期104-110,共7页Seismological and Geomagnetic Observation and Research

基　　金：震情跟踪定向工作任务(2015010412);山西省地震局科研项目(SBK-1523)联合资助

摘　　要：2014年大同地震台地电阻率NW测向出现年变畸变现象,经现场调查,发现观测环境、观测系统正常;利用褶积滤波法去除降雨量和地下水位影响,发现年变幅减小变化依旧存在;应用小波变换方法进行处理,发现小波能谱可较好反映地电阻率变化,且2014年NW向地电阻率数据的小波能谱及其相对变化显著增大,而在张北及大同成组地震前,曾出现类似变化,而且小波能谱值越大,对应发生的地震震级越大。The annual aberration of resistivity of NW component at Datong station has been detected since 2014. After investigation,we found that the observation system is working properly, surrounding environment changes and geo-electric resistivity are not synchronized in time. The anomaly still exists after removing the effects of rainfall by convolution filtering method. After Wavelet transform technique be applied to the analysis of geo-resistivity data, the wavelet power spectrum can well respond to the geo-resistivity variation. The wavelet power spectrum and its relative variation increased greatly in NW direction in 2014, similar to the increment before Datong and Zhangbei earthquake group. And the wavelet power spectrum value is greater with corresponding to the greater earthquake magnitude.

关 键 词：地电阻率 异常分析 褶积滤波 小波能谱 

分 类 号：P315.722[天文地球—地震学]