江苏流体井网水位对青海玛多7.4级地震同震响应特征差异及原因分析  

Co-seismic Response Characteristics and Cause Analysis of the Pattern Water Level of Fluid Well in Jiangsu Area Related to the M_(s) 7.4 Maduo Earthquake in Qinghai

作　　者：胡米东 毛华锋[1] 陈启林[1] 王皓[1] 张杰[1] 霍雨佳[1] 黄群[1] HU Midong;MAO Huafeng;CHENG Qilin;WANG Hao;ZHANG Jie;HUO Yujia;HUANG Qun(Jiangsu LIyang Seismic Station,Jiangsu Liyang 213332,China)

机构地区：[1]江苏省溧阳地震台,江苏溧阳213332

出　　处：《四川地震》2021年第3期22-27,共6页Earthquake Research in Sichuan

摘　　要：本文收集整理江苏流体井网对青海玛多7.4级地震同震响应水位资料、各流体井基本参数资料和井周边构造资料,分析同震响应特征和特征差异,探讨差异原因。资料显示,27口观测井中17口井水位出现同震响应;响应类型分振荡型和阶跃型两类。对于不同观测井,震级与震中距不是影响同震响应幅度的主要因素,井孔位置是否位于断裂带上或者断裂带附近,井含水层系统固有振动周期和振动阻尼系数都对同震响应幅度有重要影响。人工授时导致的误差和观测设备低采样率是导致部分井同震响应起始时间差异的主要原因,低采样率也导致同一口观测井同震响应时上下振幅大小不对应。In this paper,we collected and sorted out the water level data of the co-seismic response of the fluid well pattern in Jiangsu area related to the Ms7.4 Maduo earthquake in Qinghai.Using the basic parameter data of each fluid well and the surrounding structural data,analyzed the co-seismic response characteristics and the difference in characteristics,and discussed the mechanisms for the differences.The data shows that the co-seismic response was recorded in the 17 of 27 observation wells.The co-seismic responses can be divided into two types:oscillation type and step type.Magnitude and epicenter distance of an earthquake are not the main factors affecting amplitude of the co-seismic response in observation wells in different regions.Location of the well,whether it is located on or near the fault zone,natural vibration period and vibration damping coefficient of the aquifer system of the well have an important influence on the co-seismic response amplitude.The error caused by manual timing and low sampling rate of observation equipment are the main reasons for the difference in co-seismic response time of wells at similar areas.The low sampling rate also leads to the asymmetry of the upper and lower amplitudes of the co-seismic response of the same observation well.

关 键 词：青海玛多7.4级地震 江苏流体井 井水位观测 同震响应 

分 类 号：P315.723[天文地球—地震学]