地震前后岩石圈磁场变化特征分析  

Analysis of the variation characteristic in the lithospheric geomagnetic field before and after earthquakes

作　　者：顾春雷[1,2] 张毅[2] 徐如刚[2] 王雷[2] 

机构地区：[1]中国科学技术大学地球与空间科学系,合肥230026 [2]安徽省地震局,合肥230031

出　　处：《地球物理学进展》2010年第2期472-477,共6页Progress in Geophysics

基　　金：地震行业科研专项"2007-08-011"资助

摘　　要：本文以九江瑞昌M_s 5.7级地震和汶川M_s 8.0级地震为研究对象,根据两个震区地震后观测所得地磁场三分量数据和"2005.0中国地磁图"项目所积累的地磁场三分量数据,建立了两个震区的岩石圈磁场模型.通过对比分析两个震区岩石圈磁场总强度、磁偏角、磁倾角三个独立分量地震前后的时空变化特征,初步探讨地震与岩石圈磁场变化关系,寻找有效震磁变化信息.结果表明:(1)两次震中均位于岩石圈磁场的磁偏角和磁倾角零值线附近;(2)震后震中百公里范围内岩石圈磁场分量均出现了不同程度的异常变化;(3)震中附近岩石圈磁场出现了明显的与地震相关的变化,该变化在两个震区表现出相近的规律性.This paper focuses on the geomagnetic field variation produced by lithosphere before and after the Ms=5.7 Jiujiang-Ruichang earthquake and the Ms=8.0 Wenchuan earthquake.According to the three-component survey data after these earthquakes and ＂2005.0 China Geomagnetic Chart＂ before the earthquakes,lithospheric geomagnetic field models of the two research regions are established.The relations between the earthquakes and different components of the geomagnetic field are preliminarily researched,by comparing and analyzing the variation characteristics of the geomagnetic field（F,D,I,）in the Jiujiang-Ruichang and Wenchuan region.The results show that two earthquake epicenters are located in the vicinity of declination and inclination zero line.After the earthquakes,different components of the geomagnetic field produce different abnormal changes.There are some obvious changes of the geomagnetic field related with the earthquakes in the vicinity of epicenters,and the changes of two earthquake regions have similar regularity.

关 键 词：岩石圈磁场 "2005.0中国地磁图"震磁异常 九江-瑞昌地震 汶川地震 

分 类 号：P315[天文地球—地震学]