摘要
通过云南数字化井水位对青海玛多Ms 7.4地震同震响应特征进行分析,并对井水位同震响应机理进行讨论。结果表明,云南27口观测井对青海玛多Ms 7.4地震同震响应,主要分布在小江断裂带两侧及其附近地区。井水位同震响应形态有振荡—复原型、阶变(缓变)型和振荡伴随阶变型三种变化类型,以振荡—复原型变化为主。各观测井水位同震响应表现出的差异性与井震距、地震能量密度、观测仪器采样率、井-含水层系统等因素有关。水位秒钟值记录的动态变化更为完整,但水位秒钟值数据收集和使用的不方便之处需要改进。青海玛多Ms 7.4地震引起云南各观测井水位同震响应变化形态可以用弹性理论来解释,三种不同形态是由各观测井井—含水层介质对地震波的响应程度不同造成的。
Based on the analysis of co-seismic response characteristics of digital well water level in Yunnan Province during Maduo Ms7.4 earthquake in Qinghai Province,the mechanism of co-seismic response to well water level is discussed.The results show that,the 27 co-seismic response observation Wells in Yunnan is mainly distributed on both sides of the Xiaojiang fault zone and its adjacent areas.The co-seismic response of well water level can be divided into three types:oscillation-restoration type,step change(slow change)type and oscillation-associated step change type,and the oscillation-restoration type are the main type.The co-seismic response of water level of every observation well has some difference,which is related to well seismic distance,seismic energy density,sampling rate of observation instrument,well-aquifer system and so on.The recording of the dynamic changes of the water level in seconds is more complete,but the inconveniences of collecting and using the water level in seconds data need to be improved.The variation patterns of co-seismic response of water level of every observation well in Yunnan caused by Maduo Ms7.4 earthquake in Qinghai Province can be explained by elastic theory,and the three different patterns are caused by the different response degree of each observation well-aquifer medium to seismic wave.
作者
段胜朝
张山元
番绍辉
孙自刚
杨铭昌
DUAN Shengchao;ZHANG Shanyuan;FAN Shaohui;SUN Zigang;YANG Mingchang(Tengchong Seismic Monitoring Center station,Yunnan Earthquake Agency,Tengchong 679100,China)
出处
《高原地震》
2022年第4期11-20,共10页
Plateau Earthquake Research
基金
云南省地震局自立科研项目“漾濞地震专项”(项目编号:2021YBZX07)资助。
关键词
青海玛多Ms
7.4地震
云南井水位
同震响应
水位振荡
弹性理论
Maduo Ms7.4 earthquake in Qinghai Province
Water level in Yunnan Province seismic observation wells
Co-seismic response
Water level oscillation
Sampling rate of observation instrument
Elastic theory
