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广东地区近震ML震级量规函数
吕作勇1,2,3) 马晓静1,2,3) 房立华4)
1)广东省地震局,广州市先烈中路81号大院1号 510070;2)中国地震局地震监测与减灾技术重点实验室,广州市先烈中路81号大院1号 510070;3)广东省地震预警与重大工程安全诊断重点实验室,广州市先烈中路81号大院1号 510070;4)中国地震局地球物理研究所,北京 100081
摘要:
收集了广东地震台网记录的地震资料,根据Richter提出的原始ML震级定义,分别采用了频率域和时间域2种仿真技术将宽频带速度波形仿真为伍德-安德森地震仪波形,在仿真后的波形上自动量取地震水平向最大振幅,研究获得了广东地区近震ML震级的量规函数。通过对各台站计算的ML震级残差的统计分析,获得了广东地震台网44个台站的台站校正。对台站校正的Z检验结果表明,44个台站中有38个台站的台站校正明显不为0。新量规函数以及台站校正的应用,有效提高了广东地震台网测定ML震级的精度,使ML震级测定的离散程度降低约30%。
关键词:  广东地震台网  近震ML震级  量规函数  台站校正
DOI:
分类号:
基金项目:中国地震局监测预报司测震台网青年骨干培养专项(20130213)资助
The calibration function of local magnitude for the Guangdong region
Lü Zuoyong1,2,3) Ma Xiaojing1,2,3) Fang Lihua4)
1)Earthquake Administration of Guangdong Province, Guangzhou 510070,China;2)Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology,China Earthquake Administration,Guangzhou 510070,China;3)Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Projects of Guangdong Province,Guangzhou 510070,China;4)Institute of Geophysics,China Earthquake Administration,Beijing 100081,China
Abstract:
According to the local magnitude definition by Richter,we collected local earthquake data recorded by the Guangdong Digital Seismic Network and measured the maximal amplitude on simulated Wood-Anderson seismograms of the broadband seismograms,which were simulated in frequency and time domain respectively. Using these two kinds of data,two calibration functions of the local magnitude scale for Guangdong region have been obtained. The correction of the 44 seismic stations of the Guangdong Digital Seismic Network has been calculated by analyzing the ML residuals for each station. Using a Z-test,we found that the correction of 38 stations was significantly different from 0.The application of the new local magnitude scale and station correction,the overall variance of the mean magnitude estimates have been reduced by 30%.
Key words:  Guangdong Digital Seismic Network  Local earthquake magnitude  Calibration function  Station correction