2007年3月13日福建顺昌4.9、4.7级地震前福建流动地磁观测资料异常分析

Analysis on the Anomalies in Mobile Geomagnetic Survey before Shunchang M4.9,4.7 Earthquakes on March 13,2007 in Fujian Province

摘要:

利用地磁差值年同期差值法计算分析得出2006年4月福建西部的流磁观测结果出现异常,认为可能与福建顺昌4.9级、4.7级地震前的区域应力场增强有关;震前沿断裂走向分布的流磁测点同步出现异常,可能与断裂构造部位应力比较集中有关。

Abstract:

Using the method of geomagnetic annual difference, the anomalies in data of mobile geomagnetic survey in April, 2006, in west area of Fujian province are ideatified. It is considered that the anomalies are relate to the increasing of the regional stress field before M4.9 and M4.7 earthquakes in Shunchang county, Fu）ian province. It is also found that the anomalies synchronistically occurred in the stations which distribute along a fault before the earthquakes. It is possible that the phenomena is relate to the stress centralizing in some structure parts.