2019年唐山M_(L)4.9地震与1976年唐山7.8级地震的相关性分析  

Correlation analysis between Tangshan M_(L)4.9 earthquake in 2019 and the Tangshan M 7.8 earthquake in 1976

作　　者：刘燕翔 王妍 李金 符泽宇 荣伟健 杨永旺 路彤 LIU Yanxiang;WANG Yan;LI Jin;FU Zeyu;RONG Weijian;YANG Yongwang;LU Tong(Tangshan Earthquake Monitoring Center,Hebei Province 063021,China)

机构地区：[1]唐山地震监测中心台,中国河北063021

出　　处：《地震地磁观测与研究》2021年第1期42-47,共6页Seismological and Geomagnetic Observation and Research

摘　　要：2019年12月5日8时2分,河北唐山丰南区(39.31°N,118.04°E)发生ML 4.9地震,震中位于唐山断裂、蓟运河断裂、宁河—昌黎断裂的交汇部位。从地震地质背景、1976年唐山7.8级地震老震区发震规律、余震震中分布及其与唐山7.8级地震间的关系等方面进行分析发现,唐山M_(L)≥4.0地震的发震时间间隔随着时间的推移有所起伏,最大发震时间间隔也逐渐加大,此次地震是唐山7.8级地震的余震。At 08:02 on December 5,2019,an ML 4.9 earthquake occurred in Fengnan District(39.31°N,118.04°E),Tangshan,Hebei.The epicenter was located at the intersection of Tangshan fault,Ji Canal fault,and Ninghe-Changli fault.Analysis from the aspects of Tangshan earthquake geological background,seismogenic rule in the source region of the 1976 magnitude 7.8 earthquake and its aftershock epicenter distribution,and the relationship with the magnitude 7.8 earthquake shows that the recurrence time interval of M_(L)≥4.0 earthquakes varies with the passage of time and the maximum shock interval also gradually increased.The ML 4.9 earthquake is an aftershock of the magnitude 7.8 earthquake.

关 键 词：唐山M_(L)4.9地震 余震震中分布 发震规律 断裂 

分 类 号：P315[天文地球—地震学]