河北测震台网单台震级偏差分析

Analysis of deviations of magnitude measured at a single seismic station in Hebei Seismic Network

以河北测震台网记录的河北及周边地区地震事件为数据源,计算单台测定震级与台网平均震级的平均偏差、标准偏差,采用统计、对比、归纳分析等方法,分析偏差的分布情况,依据震中距分段计算平均偏差,得到震级偏差的分布规律及相应校正值;最后通过对量规函数、台基岩性等进行校正,对比拟合出符合河北台站特点的新量规函数,使误差精度在规定范围之内。

This paper measures single station magnitudes and network average magnitudes for earthquakes in Hebei and surrounding areas using seismic records from Hebei Seismic Network and calculates the average deviations and standard deviations for single station magnitudes.Using statistics,comparisons,inductive analysis,and other methods,we analyze the distribution characteristics of the magnitude deviations.We calculate average magnitude deviations in successive epicentral distance intervals to obtain their distribution rules and correction values;finally,after removing base lithology responses for seismic records and calibrating magnitudes using calibration functions,a new calibration function is obtained for Hebei Seismic Network,which gives magnitude errors within a specified range.