云南近期M≥5级地震前的地磁短临异常  

SHORT-IMPENDING ANOMALIES OF GEOMAGNETISM BEFORE THE EARTHQUAKES WITH M≥5 IN YUNNAN IN RECENT YEARS

作　　者：李树华[1] 付虹[1] 刘丽芳[1] 

机构地区：[1]云南省地震局,云南昆明650041

出　　处：《高原地震》2002年第3期41-47,共7页Plateau Earthquake Research

基　　金：国家重点攻关 96- 913 - 0 9课题资助

摘　　要：云南近期发生的一系列中强震前 1个多月内 ,大多数地磁曲线都有较明显的加速上升或加速下降过程 ,笔者用这些异常对其中的几次地震作了一定程度的预测。通过对这些地磁短临异常的分析 ,认为在云南M≥ 5级地震前 ,多台项地磁会出现准同步异常 ;在成组地震连发的过程中 ,地磁对后续地震的预测尤为有用 ,通常是第 1个地震发生后 ,异常明显恢复 ,在下次地震发生前再次出现新异常 ,且异常可以多台同时、多次出现 ;地磁对时间预报的贡献较大 ,但在地点判断上相对困难 。Many geomagnetic curves show the obvious process of accelerated rise or descent more than one month before a series of moderate earthquakes occurred in Yunnan in recent years.The authors predicted several earthquakes according to these anomalies.By analysing these short-impending anomalies of geomagnetism,the multi-item geomagnetism appears quasi-synchronous anomaly before the earthquakes with M≥5 in Yunnan;Geomagnetism is very useful for the prediction of following earthquakes when groups of earthquakes occurred in succession.Usually,the anomalies resume evidently after the occurrence of the first earthquake.The new anomalies arise again before the occurrence of the next earthquake,and the anomalies can arise simultaneously or repeatedly at several stations;Geomagnetism makes a great contribution to the time forecast,but it is difficult to predict the place.

关 键 词：云南 中强震 地磁异常 地震预测 地震前兆 

分 类 号：P315.721[天文地球—地震学]