山西及邻区中强地震地磁异常综合特征分析  

Analysis of comprehensive characteristics of geomagnetism anomaly before moderate-strong earthquakes in Shanxi and adjacent areas

作　　者：郭文峰 闫计明[1] 刘素珍[1] 曹志勇[2] GUO Wenfeng;YAN Jiming;LIU Suzhen;CAO Zhiyong(Shanxi Earthquake Agency,Taiyuan 030021,China;Taiyuan university of technology,Shanxi Province 030024,China)

机构地区：[1]山西省地震局,太原030021 [2]太原理工大学,山西030024

出　　处：《地震地磁观测与研究》2021年第5期103-109,共7页Seismological and Geomagnetic Observation and Research

基　　金：山西省地震局2020年度青年科研项目(项目编号:SBK-2030);山西省地震局攻关子项目(项目编号:SBK-1936-01)。

摘　　要：收集数字化观测以来山西及邻区地磁台站数据,利用地磁低点位移法、地磁加卸载响应比法和地磁日变幅逐日比法等多种地磁分析方法,分析了山西及邻区4次中强地震前地磁异常特征。研究发现,这些异常类型与该区域中强地震间存在一定相关性,地震多发生在异常预测线集中交汇区域,这缩小了地震预测范围;异常数量的增加提高了单一方法的可信度,预示着发震概率的增高。通过对震前各种异常类型的分析,认为地磁异常综合特征对山西及邻区中强地震的短临预测有一定参考价值。In this paper,we collect the digital geomagnetic observations in Shanxi and adjacent areas to analyze geomagnetic anomaly characteristics before 4 moderate-strong earthquakes in Shanxi and adjacent areas using various geomagnetic analysis methods such as geomagnetic low-point displacement,geomagnetic load-unload response ratio,and the daily ratio of geomagnetic amplitude.The results show that these types of anomalies were related to moderate-strong earthquakes in the region.Earthquakes mostly occur in the joint region of the prediction lines,which narrows the scope of earthquake prediction;the increase in the number of anomalies improves the reliability of a single method and indicates an increase in the probability of earthquake occurrence.Through the analysis of various anomaly types before earthquakes,it is believed that the comprehensive characteristics of geomagnetic anomalies have references for the short-term prediction of moderate-strong earthquakes in Shanxi and adjacent areas.

关 键 词：中强地震 地磁异常 低点位移 加卸载响应比 逐日比 

分 类 号：P315.721[天文地球—地震学]