大地震前体应变临震异常现象  

Abnormal Phenomena of Body Strain before Large Earthquakes

作　　者：吴利军[1] 陈正位[1,2] 李函谷[1] 徐磊[3] 安巴雅尔 徐顺强[5] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震局地震预测研究所地震预测重点实验室,北京100036 [3]山东省地震局无棣大山地震台,滨州无棣251910 [4]山东省威海市地震局,威海264200 [5]中国地震局地球物理勘探中心,郑州450002

出　　处：《震灾防御技术》2015年第1期151-162,共12页Technology for Earthquake Disaster Prevention

基　　金：中国地震局监测;预测;科研三结合课题"Sacks体应变临震异常的震例统计研究(154201)";地震预测研究所基本科研业务专项(2012IES010202)资助

摘　　要：本文对2011年1月至2014年4月间全球发生的80次MS≥7级地震前,二张营台和天堂河台Sacks体应变临震异常现象进行了研究,针对复杂震例提出了异常识别的前提条件。统计结果显示,体应变观测对震中距为8000km范围内的MS≥7级地震映震和前兆异常反映较好。同时,对异常现象进行了分类和描述,划分了三种异常类型:即固体潮畸变型、突变型和慢地震型,并对各种类型作了统计分析,初步探讨了力学性质。结果发现,体应变异常信息对未来大地震的发生具有一定的预示意义。In this paper we analyzed 80 impending earthquake anomalies of the Sacks volume strain from Erzhangying station and Tiantanghe station where abnormal phenomena took place from January 2011 to April 2014 all over the world, and their magnitudes are all no less than 7. Then, preconditions for anomaly identification are put forward in allusion to complex earthquake cases. Statistical results show that volume strain observation has a better earthquake reflecting ability for earthquakes of that magnitudes are no less than 7 and epicentral distances within 8000 kin. Our results suggest that the volume strain observation can reflect precursory anomalies of such earthquakes in a better way. Based on categorization and description of those anomalies, we divided abnormal phenomena into three types, i.e., distortion of earth tide, abrupt change type and slow earthquake. According to our results, volume strain anomaly can play a role in indicating future strong earthquake of the whole world.

关 键 词：大地震 体应变 固体潮畸变 突变 慢地震 震例研究 

分 类 号：P315.72[天文地球—地震学]