地磁Z分量日变化空间相关性与东北地区中强震关系分析  

ANALYSIS OF RELATION BETWEEN DIURNAL VARIATION OF GEOMAGNETIC Z COMPONENT AND MEDIUM STRONG EARTHQUAKES IN NORTHEAST CHINA

作　　者：岳力 YUE Li(Tonghe Seismic Station of Harbin emergency rescue support center,Harbin 150900,Heilongjiang,China)

机构地区：[1]哈尔滨市应急救援保障中心通河地震台,黑龙江哈尔滨150900

出　　处：《内陆地震》2021年第4期380-390,共11页Inland Earthquake

摘　　要：应用东北地区地磁观测台站地磁Z分量观测数据,计算2008~2017年地磁Z分量日变化空间相关系数,结合东北地区M_(S)≥4.5地震震例资料,分析该方法对于提取地磁观测数据震前异常信息的有效性,初步得出地磁Z分量日变化空间相关性出现异常对东北地区短期内发生M_(S)≥4.5地震映震关系。设定分析Z分量日变化异常参考相关系数后,对震前Z分量日变化相关性异常变化持续时间、Z分量日变化相关性异常结束后发震时间、震中位置等进行对比分析,得出地磁Z分量日变化空间相关性对中强地震短临前兆异常有一定影响。Based on the data of geomagnetic Z component observed at geomagnetic observation stations in Northeast China,the spatial correlation coefficients of diurnal variation of geomagnetic Z component from 2008~2017 are calculated.Combined with the seismic data of earthquakes with M_(S)4.5 or above in Northeast China,the relationship between the abnormal spatial correlation of diurnal variation of geomagnetic Z component and earthquakes with M_(S)4.5 or above occurring in Northeast China in a short time is analyzed.After setting and analyzing the reference correlation coefficient of Z component daily variation anomaly,the abnormal change duration of Z component before the earthquake,the earthquake occurrence time after the end of Z component daily variation correlation anomaly,and the epicenter location are compared and analyzed.It is concluded that the spatial correlation of geomagnetic Z component daily variation has certain effect on the short-term and impending precursory anomalies of moderate strong earthquakes.

关 键 词：空间相关性 Z分量日变化 震前异常 东北地区 

分 类 号：P315.7[天文地球—地震学]