李富珍^1,,
张怀^1,,,
唐磊²,
石耀霖¹
1. 中国科学院大学地球与行星科学学院, 计算地球动力学重点实验室, 北京 100049
2. 应急管理部国家自然灾害防治研究院, 北京 100085

基金项目: 国家自然科学基金(U1839207，41590865，41774106，41974018)，国家重点研发计划(2018YFC1504200)和中央级公益性科研院所基本科研业务专项(ZDJ2018-09)共同资助


详细信息

作者简介: 李富珍, 女, 1994年生, 博士, 主要从事地球动力学研究.E-mail: lifuzhen17@mails.ucas.ac.cn

通讯作者: 张怀, 男, 1973年生, 教授, 博士生导师, 主要从事计算地球动力学研究.E-mail: hzhang@ucas.ac.cn

中图分类号: P315

收稿日期:2020-11-20
修回日期:2020-12-21
上线日期:2021-05-10

Determination of seismic surface wave strain magnitude based on borehole strain seismic wave records

LI FuZhen^1,,
ZHANG Huai^1,,,
TANG Lei²,
SHI YaoLin¹
1. Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
2. National Institute of Natural Hazards, Ministry of Emergency Management of the People's Republic of China, Beijing 100085, China


More Information

Corresponding author: ZHANG Huai,E-mail:hzhang@ucas.ac.cn

MSC: P315

--> Received Date: 20 November 2020
Revised Date: 21 December 2020
Available Online: 10 May 2021


摘要
摘要:近年发展的高采样率的钻孔应变仪可以记录到地震波造成的水平应变，是动态库仑应力研究的重要手段.利用钻孔应变仪记录的应变地震波确定地震震级，是一个重要的科学课题.本文收集了我国10个应变台站四分量钻孔应变仪2020年1—3月记录的10 Hz采样应变地震波资料，共选出震级M≥4.0的浅源地震68个，用最小二乘法求得应变震级公式为M_ε=lgE_max+1.65lg(Δ)+1.43.对于6.5级以下的地震，计算得到的应变震级与中国地震台网中心公布的震级M_CENC基本一致：M_CENC=1.03-0.23，但本研究中的两个7级地震，应变震级出现了震级饱和现象.本文的基本结论是：应变定震级是可行的，但对于两个7级地震的饱和现象需要进一步深入研究，因为它们不但涉及震级确定，而且涉及远震动态库仑应力触发地震的研究.今后要对更多的大震钻孔应变波形记录进行分析.
关键词: 四分量钻孔应变仪/
应变震级/
震级测定/
震级偏差

Abstract:The high sampling rate borehole strain gauge, developed in recent years, can record the horizontal strain caused by seismic waves, which is a crucial method for the study of dynamic Coulomb stress. It is an important scientific topic to determine earthquake magnitude by using strain seismic waves that recorded by borehole strain gauge. In this study, strain seismic wave data recorded by four-component borehole strain gauges at ten stations in China from January to March in 2020 are collected, and a total of 68 shallow source earthquakes with magnitude M ≥ 4.0 are selected. The strain magnitude formula obtained by using the least square method is M_ε=lgE_max+1.65lg(Δ)+1.43. For earthquakes with magnitude M < 6.5, the strain magnitude calculated is basically consistent with the magnitude M_CENC published by the China Earthquake Networks Center: M_CENC=1.03-0.23. However, the strain magnitudes of the two earthquakes with magnitude M>7.0 in this study occur magnitude saturation phenomenon. The basic conclusion of this paper is that using strain to determine magnitude is basically feasible, but the saturation phenomenon of the two earthquakes with magnitude M>7.0 needs to be further studied. Because they contain not only the determination of earthquake magnitude, but also the study of triggering effect of dynamic Coulomb stress caused by remote earthquakes. In the future study, analyzing more borehole strain seismic wave records of large earthquakes are needed.
Key words:Four-component borehole strain gauge/
Strain magnitude/
Magnitude measurement/
Magnitude deviation



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