湖北宜昌台DZW重力仪观测质量及记录地震特征  

Analysis of Data Quality and Recorded Seismic Characteristics of DZW Gravimeter at Yichang Seismic Station

作　　者：况春利 KUANG Chuni(Key Laboratory of Earthquake Geodesy,Institute of Seismology of China Earthquake Agency,Hubei Wuhan 430071,China;Earthquake Agency of Hubei Province,Hubei Wuhan 430072,China;Yichang Seismic Monitoring Center Station of Hubei Earthquake Agency,Hubei Yichang 443100,China)

机构地区：[1]中国地震局地震研究所地震大地测量重点实验室,湖北武汉430071 [2]湖北省地震局,湖北武汉430071 [3]湖北省地震局宜昌地震监测中心站,湖北宜昌443100

出　　处：《四川地震》2024年第1期24-29,共6页Earthquake Research in Sichuan

基　　金：湖北省地震局(中国地震局地震研究所)基础科研基金项目(306337-37)。

摘　　要：为了分析湖北宜昌台DZW重力仪2020—2022年观测资料的质量,总结宜昌台重力仪的记录地震能力,为地震预测提供准确的参考资料。首先对宜昌台重力仪2020—2022年观测资料的完整性、连续性、M_(2)波潮汐因子和M_(2)波潮汐因子中误差进行了分析,再以宜昌台为圆心,对半径5 000 km范围内的2020—2022年重力仪记录的M_(S)≥4.0地震资料和实际地震的对应情况进行统计分析,得到重力仪对震中距5 000 km范围内地震的记录能力,最后获得震级(M_(S))与震中距(R)的理论拟合关系为M_(S)=1.185 7lg R+2.153 5,进而推导出宜昌台重力仪记录的最小地震为M_(S)2.1。但因受到震源深度、地下传播介质、震源区地质构造共同作用,以及震中距1 000 km内的地震记录有限,导致宜昌台实际记录最小地震与计算结果有所差异。Based on the observation data of DZW gravimeter at Yichang station from 2020 to 2022,we analyzed the parameters such as integrity rate,data continuity,tide factor of M_(2) wave,and relative error.This paper used the earthquake catalog(M_(S)≥4.0)within 5000 km of Yichang station from 2020 to 2022 to analyze the characteristics of seismic events recorded by the DZW gravimeter,which was characterized by the partial coseismic response of the gravimeter.Moreover,we obtained the capability of the Station to record the earthquakes within 5000 km.The theoretical fitting straight lines(M_(S)=1.1857lgR+2.1535)were obtained by the distribution of the magnitudes and the distance among the earthquakes.The induced minimum earthquake recorded by the Yichang station was M_(S)2.1 according to the joint influence of the focal depth,the subsurface propagation medium,the hypocenter geological structure,and limited seismic records within 1000 km of the epicenter.Therefore,the theoretical recorded minimum earthquake was different from actual recorded minimum earthquake at the Yichang station.

关 键 词：重力观测 震中距 记录地震 宜昌台 

分 类 号：P315.7[天文地球—地震学]