银川地震台面波震级偏差分析

ANALYSIS ON SURFACE WAVE MAGNITUDE DEVIATION IN YINCHUAN EARTHQUAKE

使用多元稳健回归方法,对比2020年1月~2021年12月银川地震台所测定的中强地震的面波震级与中国地震台网中心(CENC)给出的面波震级的偏差。结果表明银川地震台所测定的震级比中国地震台网中心的震级平均略低0.02,总体偏差较小,且较为稳定。同时分析了面波震级偏差与震级大小、震中距、震中方位的关系,以期提高银川地震台地震监测能力。

Using the multivariate robust regression method,the deviation between the surface waves magnitudes of moderate and strong earthquakes measured by the Yinchuan Seismic Station from 2020⁃01 to 2021⁃12 and the surface wave magnitudes given by the China Earthquake Network Center(CENC)was compared.The mag⁃nitude of the earthquake is slightly lower than the China Seismic Network Center by 0.02 on average,and the overall deviation is small and relatively stable.At the same time,the relationship between surface waves mag⁃nitude deviation and magnitude,epicenter distance and epicenter azimuth is analyzed,in order to improve the seismic monitoring capability of Yinchuan station.