麻城地震台远震体波震级偏差分析  

Magnitude deviation analysis for teleseismic body wave magnitude determined by Macheng Seismic Station

作　　者：彭籽壹 胡洪 梁子晗 倪乙鹏 PENG Ziyi;HU Hong;LIANG Zihan;NI Yipeng(Hubei Earthquake Agency,Wuhan 430071,China;Hubei Key Laboratory of Earthquake Early Warning,Hubei Earthquake Agency,Wuhan 430071,China)

机构地区：[1]湖北省地震局,中国武汉430071 [2]地震预警湖北省重点实验室,中国武汉430071

出　　处：《地震地磁观测与研究》2024年第2期28-33,共6页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局地震研究所基本科研业务费专项;中国地震局地壳应力研究所基本科研业务费专项(项目批准号:IS306337);湖北省地震局基础科研基金(项目编号:2022HBJJ019)。

摘　　要：收集整理麻城地震台记录完整的203个远震事件,按照新的震级国家标准GB17740-2017,测定短周期体波震级mb及宽频带体波震级mB(BB),与全球矩心矩张量项目(GCMT)中提供的矩震级MW进行对比,计算震级偏差,并分析震级偏差与震级、震中距、震源深度及震中方位角之间的关系。结果表明:麻城地震台单台测定的mB(BB)震级与MW震级的吻合程度更高,受各种因素影响相对较小,映震能力相对较强。The complete waveforms of 203 teleseismic events recorded by Macheng Seismic Station were collected and sorted,and the short-period body-wave magnitude mb and the broadband body-wave magnitude mB(BB)were measured according to the National Standard of New Magnitude’s rules.We compared these magnitudes with the moment magnitude MW provided by the Global Centroid-Moment-Tensor(GCMT)Project and calculated the deviation values.We then analyzed the relationship between magnitude deviation and magnitude,epicentral distance,focal depth,and azimuth using statistical methods.According to the analysis results,the magnitude mB(BB)of Macheng Seismic Station is more consistent with the magnitude MW and is relatively less affected by various factors,and its earthquake reflecting ability is relatively strong.

关 键 词：体波震级 震级国标 震级偏差 

分 类 号：P31[天文地球—固体地球物理学]