江苏及邻区地方性震级量规函数的研究

Study on Calibration Function of Local Earthquakes in Jiangsu and Its Adjacent Areas

摘要:

基于2009~2018年江苏及相邻数字地震台网记录的2602次地震事件观测资料，通过震级残差统计方法得到了72个台站的单台震级与台网平均震级的偏差、平均偏差和标准偏差，分析了震级偏差频次分布和定量统计结果，进而修正了江苏及邻区的地方性震级量规函数。实际地方性震级测定结果表明，使用校正后的量规函数比新震级国家标准（GB17740—2017）中量规函数所测定的震级的标准差更小，且单台震级残差相对更集中于0，这说明该量规函数有助于提高江苏及邻区地方性震级测定精度。

Abstract:

Based on the observation data of 2602 seismic events recorded by the Digital Seismic Networks of Jiangsu and its adjacent areas from 2009 to 2018,the deviation between the single magnitude of 72 stations and the mean magnitude of the networks,mean deviation and standard deviation were calculated by using the statistical method of magnitude residual. The magnitude deviations of earthquakes are analyzed on the frequency distribution and quantitative statistics. Furthermore,we obtain the representative calibration function in Jiangsu Province and its adjacent areas. The results of actual local earthquake magnitude measurement show that the standard deviation of magnitude determined by the calibrated calibration function is smaller than that determined by the calibration function in the National Magnitude Standard of China(GB17740-2017),and the residual magnitude of a single station is relatively more concentrated at 0,which indicates that the calibrated calibration function is helpful to improve the accuracy of local earthquake magnitude measurement in Jiangsu and its adjacent areas.