2008年汶川M_(S)8.0地震及其强余震的地磁观测同震响应  

Coseismic response of geomagnetic observations to the 2008 Wenchuan M_(S)8.0 earthquake and strong aftershocks

作　　者：畅国平 王秀敏 王志敏 王晨晖 胡秀娟 王利兵 CHANG Guoping;WANG Xiumin;WANG Zhimin;WANG Chenhui;HU Xiujuan;WANG Libing(National Field Scientific Observation and Research Station for Huge Thick Sediments and Seismic Disasters in Hongshan,Hebei Province,Hebei Province 055350,China;Xingtai Earthquake Monitoring Center Station,Hebei Province 054000,China;Zhangjiakou Earthquake Monitoring Center Station,Hebei Province 075001,China)

机构地区：[1]河北红山巨厚沉积结构与地震灾害国家野外科学观测研究站,河北055350 [2]邢台地震监测中心站,河北054000 [3]张家口地震监测中心站,河北075001

出　　处：《地震地磁观测与研究》2025年第1期85-91,共7页Seismological and Geomagnetic Observation and Research

基　　金：河北红山巨厚沉积结构与地震灾害国家野外科学观测研究站课题(项目编号:DZ2021110500006,DZ2023120800022);中国地震局监测、预报、科研三结合课题(项目编号:3JH-170403,3JH-202002002)。

摘　　要：2008年5月12日14时28分04秒,四川省汶川县发生M_(S)8.0地震。此次地震波及大半个中国及亚洲多个国家和地区,造成重大人员伤亡和财产损失。震后发生多次M_(S)≥4.0强余震。在主震及强余震发生过程中,银川地震监测中心站FHDZ-M15磁力仪(在地磁观测手段中,仅FHDZ-M15磁力仪记录到此次地震同震响应)记录到同震响应,分析发现:地磁场D、H、Z分量均记录到同震响应,响应形态表现为震荡衰减型,响应幅度、响应时长与震级呈正相关,响应延迟时间与震中距呈线性分布特征。On May 12,2008,at 14:28:04,an M_(S)8.0 earthquake struck Wenchuan County,Sichuan Province,China.This earthquake affected much of China and several other Asian countries and regions,causing significant casualties and property damage.Multiple strong aftershocks with M_(S)≥4.0 occurred following the main shock.During the mainshock and strong aftershocks,the FHDZ-M15 magnetometer at the Yinchuan Earthquake Monitoring Center(the only geomagnetic instrument to record coseismic responses in this event)detected coseismic responses.Analysis revealed that the geomagnetic field components D,H,and Z all exhibited coseismic responses,characterized by an oscillatory decay pattern.The response amplitude and duration positively correlated with magnitude,while the response delay time showed a linear relationship with epicentral distance.

关 键 词：汶川M_(S)8.0地震 FHDZ-M15磁力仪 余震 同震响应 

分 类 号：P315.7[天文地球—地震学]