2021年玛多7.4级地震聊古1井同震响应特征分析  

ANALYSIS ON CO-SEISMIC RESPONSE CHARACTERISTICS OF LIAOGU 1^(#)WELL CAUSED BY THE MADUO Ms7.4 EARTHQUAKE IN 2021

作　　者：温丽媛[1] 陈其峰[1] 连凯旋[1] 颜丙囤 郭宗斌 曹一 WEN Liyuan;CHEN Qifeng;LIAN Kaixuan;YAN Bingdun;GUO Zongbin;CAO Yi(Liaocheng Earthquake Monitoring Center station,Shandong Earthquake Agency,Liaocheng 252000,China)

机构地区：[1]山东省地震局聊城地震监测中心站,山东聊城252000

出　　处：《高原地震》2024年第1期1-9,共9页Plateau Earthquake Research

摘　　要：整理了聊古1井流量、水位、水温和水化学离子含量等流体测项在2021年青海玛多7.4级地震中的同震响应变化特征。结合聊古1井的构造背景,分析了同震变化的影响因素,初步探讨了同震变化机理。结果表明:聊古1井流量、水位及水温等流体测项在青海玛多7.4级地震发生后呈阶升型同震变化,井水离子含量也出现较大波动,明显高于背景值。本次青海玛多7.4级地震的流体同震响应特征表明聊古1井对远场地震反映灵敏,具有良好的映震效能。In this paper,the characteristics of co-seismic response of water flow,water level,water temperature and water chemical ion concentration in Liaogu 1 well caused by the 2021 Maduo Ms7.4 earthquake in Qinghai province are analyzed.Combined with the structural background of Liaogu 1 well,the influencing factors of the co-seismic response are analyzed,and the mechanism of the co-seismic response is preliminarily discussed.The results show that the water flow,water level and water temperature of Liaogu 1 well rise in a co-seismic manner,and the ion concentration also fluctuates greatly after the Maduo Ms7.4 earthquake in Qinghai province,significantly higher than the background values.The abnormal change of fluid is directly related to the level of dynamic stress activity generated by seismic waves.Under the action of seismic waves,the pressure of the fluid layer increases,and the dynamic stress generated by the seismic waves changes the microscopic void structure of the formation,leading to the enhanced activity of the fluid,and the interaction of water and rock.The enhancement of hydro-rock interaction and the mixing of groundwater with different properties are the main factors for the abnormal change of fluid measurement items of Liaogu 1 well after Maduo earthquake.The fluid co-seismic response characteristics of Maduo Ms7.4 earthquake show that Liaogu 1 well is sensitive to far field earthquake and still has good seismic efficiency.

关 键 词：青海玛多7.4级地震 聊古1井 同震响应 

分 类 号：P315.724[天文地球—地震学]