地磁“低点位移”现象与强震预测研究  

Geomagnetic low-point displacement phenomena and strong earthquake prediction research

作　　者：丁鉴海[1] 余素荣[2] 王亚丽[2] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震台网中心,北京100045

出　　处：《电波科学学报》2008年第6期1011-1017,共7页Chinese Journal of Radio Science

基　　金：国家科技支撑计划(2006BAC01B02-04-02);天地一体化地震预测示范应用研究(2008BAC3B00)项目共同资助

摘　　要：利用中国地磁台网40年观测资料,研究了2008年3月21日新疆于田7.3级地震,2001年11月14日昆仑山口西8.1级地震等108次强震前,地磁垂直分量日变极小值出现的时间在空间分布上的异常特征即'低点位移'现象。这种少见的异常现象与强震发生有较好的相关性,发震日期为异常日后的第27天或41天前后4天,强震发生地区在低点位移突变分界线附近。此外,还研究了于田7.3级、昆仑山口西8.1级临震前震中周围出现的地磁日变幅异常现象。地磁低点位移是复杂的地球物理现象,受多种因素影响,其'探测-感应-触发'机理仍处在探索之中。On the basis of data recorded for 40 years by the network of geomagnetic observatories in China, the anomalous features of appearance time of the minima of diurnal variations of the geomagnetic vertical component and the variation of their spatial distribution （i. e, phenomena of low-point displacement）have been studied, before XinjiangYutian Ms7.3 on March. 21,2008, Kunlunshan Ms8. 1 on Nov. 14, 2001 and more than 108 strong Earthquakes. Such rare phenomena of geomagnetic anomalies are an objective reality, being well-correlated with the occurrence of earthquakes. It has been found that most earthquakes occur in the vicinity of the boundary line of sudden change of the low-point displacement and generally within four days before and after the 27^th or 41^st day counting from the day of appearance of the anomaly. The anomalies of diurnal-variation amplitude near the epicentral area have been also studied before Yutian Ms7.3 and Kunlunshan Ms8. 1 earthquakes. The low-point displacement is one of complicated geophysical phenomena influenced by many factors and its mechanism of ＂exploring-inducing-triggering＂ is still understudy.

关 键 词：地磁“低点位移” 日变幅 于田7.3级地震 昆仑山口西8.1级地震 强震预测 

分 类 号：P315.75[天文地球—地震学]