新疆地区地磁低点位移异常与强震的关系  

RELATIONSHIP BETWEEN GEOMAGNETIC LOW-VALUE DISPLACEMENT ANOMALIES AND STRONG MOTION IN XINJIANG REGION

作　　者：沙木哈尔·叶尔肯 杨福喜[2] 马学军[1] 赵鹏毕 Samhar Erkin;YANG Fu-xi;MA Xue-jun;ZHAO Peng-bi(Xinyuan Seismic Station of Earthquake Agency of Xinjiang Uygur Autonomous Region,Xinyuan 835800,Xinjiang,China;Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局新源地震监测中心站,新疆新源835800 [2]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2021年第3期276-284,共9页Inland Earthquake

基　　金：新疆地震科学基金(201919)。

摘　　要：收集2008年1月1日~2018年12月31日的全国地磁台站垂直分量(Z)数据,运用地磁日变低点位移方法,提取并分析了新疆地区11次Ms≥6.0地震前地磁垂直分量(Z)低点位移异常,结果表明,新疆地区强地震活动与地磁垂直分量低点位移异常之间有较好的对应关系;时间特征上地震发生日期一般为异常出现后的第27±4 d或41±4 d的概率为75%,与预报指标基本一致;空间特征上呈全国性和区域性,以区域性异常为主,大部分分界线走向与新疆地区的阿尔金断裂带、西昆仑地震带、南北天山地震带走向大致一致,反映断裂带活动引起这一地区区域应力场的变化有可能产生了地磁场的异常变化。Vertical component(Z)data of national geomagnetic stations from January 1,2008 to December 31,2018 are collected,and geomagnetic daily variation low point displacement method is used to extract and analyze the low point displacement anomaly of geomagnetic vertical component(Z)before 11 earthquakes with Ms≥6.0 in Xinjiang.The results show that there is a good correspondence between strong seismicity and low point displacement anomaly of geomagnetic vertical component in Xinjiang;In terms of time characteristics,the occurrence date of the earthquake is generally the 27±4 d or 41±4 d after the occurrence of the anomaly,and the probability is 75%,which is basically consistent with the prediction index;Spatial characteristics are national and regional,mainly regional anomalies.Strike of the most boundary lines is roughly consistent with the strike of Altun fault zone,West Kunlun seismic zone and North-South Tianshan seismic zone in Xinjiang,reflecting the change of regional stress field caused by fault zone activity,which may change geomagnetic field.

关 键 词：地磁低点位移 强震 新疆地区 对应关系 

分 类 号：P315.7[天文地球—地震学]