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江苏及邻区地方性震级量规函数的研究
康清清1, 顾勤平1,2, 于悦颖1, 钱婷3, 黄群4, 霍祝青1
1.江苏省地震局, 南京 210014;2.中国地震局地球物理研究所, 北京 100081;3.江苏省无锡地震台, 江苏无锡 214000;4.江苏省溧阳地震台, 江苏溧阳 213300
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。
关键词:  江苏及邻区  地方性震级  量规函数  震级偏差
DOI:
分类号:P315
基金项目:江苏省地震局青年科学基金重点项目(201801)、中国地震局地震星火计划项目(XH18017Y)、国家自然科学基金(41704052)共同资助
Study on Calibration Function of Local Earthquakes in Jiangsu and Its Adjacent Areas
Kang Qingqing1, Gu Qinping1,2, Yu Yueying1, Qian Ting3, Huang Qun4, Huo Zhuqing1
1.Jiangsu Earthquake Agency, Nanjing 210014, China;2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;3.Wuxi Seismic Station, Wuxi 214000, Jiangsu, China;4.Liyang Seismic Station, Liyang 213300, Jiangsu, China
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.
Key words:  Jiangsu and its adjacent areas  Local magnitude  Calibration function  Magnitude deviation