2021年宁晋M_(L) 3.7地震前后重力场变化  

Variations of gravity field before and after Ningjin M_(L) 3.7 earthquake

作　　者：张庆扬 张展伟 刘洪良[1] 杨雅慧 ZHANG Qingyang;ZHANG Zhanwei;LIU Hongliang;YANG Yahui(Baoding Earthquake Monitoring Central Station,Hebei Earthquake Agency,Hebei Province 071000,China)

机构地区：[1]河北省地震局保定地震监测中心站,河北071000

出　　处：《地震地磁观测与研究》2023年第3期128-132,共5页Seismological and Geomagnetic Observation and Research

基　　金：河北省地震局星火计划:宁晋3.7级地震前后重力场变化分析(项目编号:DZ2021112300001)。

摘　　要：利用大华北重力测网中邢台测网2019—2021年流动重力观测资料,分析2021年7月15日邢台宁晋M_(L) 3.7地震前邢台—宁晋地区不同时间尺度重力场变化。研究表明:0.5年尺度重力场变化图像较好反映出此次地震前10个月的重力场由正常变化形态→震前重力场高梯度带→震后重力场高梯度带减弱的演化过程。Based on the mobile gravity observation data from Xingtai Networks in Great North China Gravity Networks from 2019 to 2021,this paper analyzed the variations of the gravity field on different time scales in Xingtai-Ningjin area before the Ningjin M_(L) 3.7 earthquake in Xingtai City on July 15,2021.The results show that the gravity field variation image ona half-year scale can better reflect the evolution process of the gravity field in the 10 months before the earthquake,i.e.,from the normal change pattern to the high gradient zone of gravity field before the earthquake and then to the weakening of the high gradient zone after the earthquake.

关 键 词：邢台宁晋M_(L) 3.7地震 重力变化 零等值线 

分 类 号：P315.726[天文地球—地震学]