利用远震面波估计凉山州地震综合观测钻孔应变仪的耦合系数  

Estimation of borehole strain observations coupling coefficients using teleseismic surface wave and collocated strain seismic wave records observed in Liangshan

作　　者：王晓蕾[1] 薛兵[1] 朱小毅[1] 崔仁胜[1] 李江[1] 席继楼[1] 张兵 高尚华[1] 陈全胜 WANG XiaoLei;XUE Bing;ZHU XiaoYi;CUI RenSheng;LI Jiang;XI JiLou;ZHANG Bing;GAO ShangHua;CHEN QuanSheng(Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Beijing Geolight Technology Co.,Ltd,Beijing 102628,China)

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]北京港震科技股份有限公司,北京102628

出　　处：《地球物理学报》2024年第7期2697-2711,共15页Chinese Journal of Geophysics

基　　金：中央级公益性科研院所基本科研业务费专项(CEAIEF20230402,CEAIEF2022030106,CEAIEF20220502);国家重点研发计划项目课题(2022YFC2204301,2018YFC1503905-5)联合资助。

摘　　要：分量钻孔应变观测中的耦合系数(A、B)对于定标应变观测量具有重要意义,本文通过中国地震科学实验场深井地震综合观测项目积累的地震仪与应变仪共点观测地震波资料,验证了钻孔应变观测面波标定方法的可行性.利用三个观测台站的多个远震记录,开展了多频点面波标定实验,所获取的耦合系数对比理论固体潮标定结果具有更好的稳定行和合理性.本文的研究结果表明,提高现有钻孔应变观测台站的采样率至不少于1 Hz,深入开展远震应变地震波和共点(或近场)地震仪的面波记录对比研究,有利于获取全频段的耦合系数结果,对于提高应变观测数据的准确度及其深入应用具有重要意义.The two coupling coefficients(A,B)of component borehole strain observation are of great significance for strain measurement.In this paper,the feasibility of surface wave calibration method for borehole strain observation is verified by using the seismic data observed by the seismometers and the collocated strain gauges,which are installed in boreholes of the China Seismic Experimental Site.The statistical results of coupling coefficients,obtained from the multi-frequency surface wave calibration with multiple distant earthquakes,are more stable and reasonable than the calibration results of theoretical earth tide.Increasing the sampling rate of existing borehole strain observation to more than 1 Hz is conducive to further comparative study of far-seismic surface wave recorded by strainmeter and co-point(or near-field)seismometer,and it is helpful to obtain the coupling coefficient results in all frequency bands.These works are of great significance for improving the accuracy of strain observation data and its further application.

关 键 词：分量式钻孔应变测量 耦合系数 面波标定方法 

分 类 号：P315[天文地球—地震学]