川滇地区烈度计台站测定震级校正分析  

The analysis of the correction of the magnitude measured at intensity meter stations in the Sichuan-Yunnan area

作　　者：林彬华 金星[1,2,3] 陈惠芳[1] 于培青[1] 于伟恒 张燕明 张丽娜[1] 蔡杏辉[1] LIN Binhua;JIN Xing;CHEN Huifang;YU Peiqing;YU Weiheng;ZHANG Yanming;ZHANG Lina;CAI Xinghui(Fujian Earthquake Agency,Fuzhou 350003,China;Fuzhou University,Fujian Province 350108,China;Xiamen Institute of Marine Seismology,China Earthquake Administration,Fujian Province 361021,China)

机构地区：[1]福建省地震局,中国福州350003 [2]福州大学,中国福建350108 [3]中国地震局厦门海洋地震研究所,中国福建361021

出　　处：《地震地磁观测与研究》2020年第5期1-9,共9页Seismological and Geomagnetic Observation and Research

基　　金：国家重点研发项目(项目编号:2018YFC1504003);福建省地震局科技基金(项目编号:SF202005)。

摘　　要：烈度计台与测震台的布设环境、仪器类型不同,所测定的震级值存在一定差异。收集2017—2019年川滇地区301个烈度计台站记录的46次ML 3.0以上地震,进行震级校正。统计烈度计实测震级值与测震台网平均震级值的偏差,对原量规函数进行修正,进而做台站校正。综合修正后,利用量规函数和台站校正值重新计算烈度计震级,结果表明:在震中100 km范围内,烈度计测定震级偏差平均值由校正前的0.145降低至0.033,标准差由0.382降低至0.295,离散度减小;校正后的烈度计震级结果较优,说明本研究获得的量规函数和台站校正值更加适用于川滇地区烈度计台站的震级计算。There are certain differences in the magnitudes measured by intensity meters and seismometers Ddue to the differences inof the construction environments and instrument types in intensity meter and seismometer,there are some differences in the magnitudes measured.The research data of 301 intensity meters recorded 46 ML≥3.0 earthquakes recorded by 301 intensity meters and occurred cases with above magnitude ML 3.0 in Sichuan and Yunnan area within 2017-2019 were selected to carry outand magnitude correction were study.Based on Through the statisticsal of the deviations between the measured magnitudes measured of by intensity meters and the average magnitudes of the seismic network,and the original calibration function was modified and.Basis on the above,the station correction value was carried out.After comprehensive correction,the intensity meter magnitude was re-calculated by using the modified calibration function and the station correction value.The results show that,the mean value ofaverage magnitude deviations of that measured by the intensity meters within an epicentral distance of 100 km decreasesd from 0.145 to 0.033,and the standard deviation decreases from 0.382 to 0.295,which theshowing a reduced dispersion reduces.The result of corrected magnitude correction is better than before,and it is shownindicating that the modified calibration function and station calibration values obtained in this paper are more suitable for the magnitude calculation of for intensity meter stations in the Sichuan-Yunnan region.

关 键 词：烈度计 震级偏差 量规函数 震级校正 地震预警 

分 类 号：P315.32[天文地球—地震学]