芦山7.0级地震前的地电场异常研究  

Anomalous changes of geo-electrical observation data before the M7.0 Lushan Earthquake

作　　者：刘建波[1] 田山[1] 张磊[1] 

机构地区：[1]天津市地震局,天津300201

出　　处：《四川地震》2014年第2期26-29,33,共5页Earthquake Research in Sichuan

基　　金：中国地震局2013年度老专家科研基金课题资助项目(课题编号:201332)

摘　　要：收集了芦山7.0级地震震源区附近39个地电场台2010年以来的地电场观测资料。对所有台站原始观测资料进行检查分析后发现,多数地电场观测资料中存在着与固体潮相关的周期性变化和不规则的扰动变化,造成不能从地电场原始观测资料中识别和提取地震前兆信息。为了排除地电场各种周期性变化和远场的干扰,突出近场的地震前兆信息,本研究通过计算同台站、同测向地电场观测资料长、短极距测值的比值来进行处理。结果表明芦山地震前地电场观测有较丰富的地震短临前兆变化信息。The geo-electric observation data of 39 seismic stations around the epicenter of the M7.0 Lushan Earthquake since 2010 were collected and analyzed.Our analysis results show that the most of changes of geo-electric observation data are correlated to the regular period changes caused by the earth solid tide and to un-regular other disturb factors.So it is difficulty to derive the precursor information from the original observation data of the geo-electric field.In order to remove most kinds of periodic interferences and to highlight the precursory information,we calculate the rate of long to short time observation with same measurement directions.Our calculation results show that a rich of short- and impending-term precursory information of the geo-electric field appeared before the M7.0Lushan Earthquake.

关 键 词：芦山地震 地电场 近场异常 短临前兆 比值 

分 类 号：P315.722[天文地球—地震学]