河北唐山M4.5地震前地下流体典型异常特征分析  

Typical anomalies of underground fluid before the 2019 Tangshan M4.5 earthquake feature analysis

作　　者：唐杰 张素欣[1] 张子广[1] 盛艳蕊[1] TANG Jie;ZHANG Suxin;ZHANG Ziguang;SHENG Yanrui(Hebei Earthquake Agency,Shijiazhuang 050021,China)

机构地区：[1]河北省地震局,石家庄050021

出　　处：《华北地震科学》2020年第S01期80-85,共6页North China Earthquake Sciences

摘　　要：分析了2019年12月5日河北唐山M4.5地震前200 km范围内出现的地下流体典型异常特征。结果表明:异常形态与以往震例异常形态较为一致,具有明显的重复性,异常时间进程表现为中期异常、短期异常与临震异常3个阶段;空间上,异常主要分布在震中距100 km范围内,且与断层分布存在一定关系。综合分析认为,唐山地震孕育过程主要受区域应力场和本地构造活动的作用。This paper analyzes the typical abnormal characteristics of underground fluid within 200km before the M4.5 earthquake in Tangshan,Hebei Province on December 5,2019.The results show that the anomaly pattern is consistent with that of the previous cases,and has obvious repeatability.The anomaly time process includes three stages:medium-term anomaly,short-term anomaly and impending earthquake anomaly.Spatially,the anomaly is mainly distributed within 100 km of epicenter distance,and has a certain relationship with fault distribution.The comprehensive analysis shows that the seismogenic process of Tangshan earthquake is mainly affected by regional stress field and local tectonic activity.

关 键 词：河北唐山M4.5地震 前兆异常 地下流体 构造活动 

分 类 号：P315.72[天文地球—地震学]