甘肃积石山M6.2和新疆乌什M7.1地震前地磁低点位移异常研究  

THE RESEARCH ON GEOMAGNETIC LOW-POINT DISPLACEMENT ANOMALIES BEFORE THE M6.2 JISHISHAN EARTHQUAKE IN GANSU AND M7.1 WUSHI EARTHQUAKE IN XINJIANG

作　　者：王燕 杨斐 李旭升 滕举 WANG Yan;YANG Fei;LI Xusheng;TENG Ju(Gansu Earthquake Agency,Lanzhou 730000,China;Lanzhou National Observatory of Geophysics,Lanzhou 73000,China)

机构地区：[1]甘肃省地震局,甘肃兰州730000 [2]兰州地球物理国家野外科学观测研究站,甘肃兰州730000

出　　处：《高原地震》2024年第3期1-5,共5页Plateau Earthquake Research

基　　金：中国地震局“三结合”课题(项目编号:3JH-202402064);地震科技发展基金(项目编号:2018Y01)资助。

摘　　要：地磁观测被认为是预测强震的重要手段之一,研究强震与地磁观测资料异常的关联性,总结好震例对地震预测预报研究工作非常重要。利用地磁低点位移法研究了国家地磁台网中心产出的地磁观测资料,重点研究2023年12月18日甘肃积石山M6.2地震和2024年1月23日新疆乌什M7.1地震前两个月地磁垂直分量日变化观测资料,认为在2次地震前分别出现了2次和3次明显的地磁低点位移异常。2次地震震中位于低点位移分界线在同一幅底图上叠加后形成的交汇点附近。利用地磁低点位移异常分界线交汇现象,研究强震发生的地点和时间,对地震短临预测具有科学意义。由于地震预测预报还处于探索研究阶段,没有一种方法能完全解决地震预报问题,本研究结果是利用低点位移法预测地震的2次较为典型震例,并利用该方法预测了强震的虚报与漏报情况。Geomagnetic observation is considered one of the important means of predicting strong earthquakes.Studying the correlation between strong earthquakes and anomalies in geomagnetic observation data and summarizing earthquake examples is crucial for earthquake prediction and prediction research.The geomagnetic low point displacement method was used to study the geomagnetic observation data produced by the National Geomagnetic Network Center,with a focus on the daily variation of the geomagnetic vertical component in the two months before the Jishishan M6.2 earthquake in Gansu on December 18,2023 and the Wushi M7.1 earthquake in Xinjiang on January 23,2024.It is believed that there were two and three obvious geomagnetic low point displacement anomalies before the two earthquakes,respectively.The epicenters of two earthquakes were located near the intersection point formed by stacking the low displacement boundary on the same base map.Studying the location and time of strong earthquakes by utilizing the phenomenon of boundary intersection of geomagnetic low point displacement anomalies has scientific significance for short-term earthquake prediction.Of course,earthquake prediction is still in the exploratory stage,and no method can completely solve the problem of earthquake prediction.The research results in this paper are also two typical examples of earthquake prediction using the low point displacement method.The paper also discusses the false report and missing report of strong earthquakes in Chinese Mainland using this method.

关 键 词：积石山M6.2地震 乌什M7.1地震 地磁 低点时间 低点位移 垂直分量 

分 类 号：P315.72[天文地球—地震学] P315.75[天文地球—固体地球物理学]