格尔木地磁观测数据与中强地震关系研究  

STUDY ON THE RELATIONSHIP BETWEEN GOLMUD GEOMAGNETIC OBSERVATION DATA AND MODERATE EARTHQUAKES

作　　者：周瀚琳 赵玉红[1] 徐恺晖 李国英 ZHOU Hanlin;ZHAO Yuhong;XU Kaihui;LI Guoying(Qinghai Earthquake Agency,Xining 810005,China)

机构地区：[1]青海省地震局,青海西宁810005

出　　处：《高原地震》2024年第1期39-45,共7页Plateau Earthquake Research

基　　金：青海省地震局基金课题(项目编号:2022B02)资助。

摘　　要：利用磁偏角日变幅度斜率值与地磁垂直分量“双低点”异常法,分析了2021~2022年我国西部几次中强震前格尔木地震监测中心站地磁观测资料的异常变化特征。结果表明:格尔木磁偏角日变幅斜率值对格尔木地区附近400 km范围内5.5级以上地震有较好的对应性,主要表现为斜率高值异常后四个月内发震;格尔木地磁垂直分量在震前45天存在“双低点”异常变化,震中集中分布在该中心站400 km内。综合多个震例分析认为,将磁偏角日变幅斜率高值异常和地磁垂直分量“双低点”异常结合分析,可提高预测可信度,对未来该区域中强震发生的时间、震级、地点有一定的指示意义。The geomagnetic data of Golmud seismic monitoring center station in western China before several strong earthquakes in 2021-2022 were analyzed.It is considered that there are three kinds of abnormal changes in Golmud geomagnetic field before the earthquake:the annual change of the daily mean magnetic deviation angle,the abnormal amplitude of the daily change of the magnetic deviation angle,and the abnormal vertical component of the"double low point".The three kinds of abnormalities were summarized and analyzed,and the extraction of the abnormal amplitude of the daily change of the magnetic deviation angle was further carried out.

关 键 词：磁偏角日变幅斜率法 地磁垂直分量“双低点”法 震磁异常 

分 类 号：P315.721[天文地球—地震学]