国家地震速报备份系统定位结果评估
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摘要
国家地震速报备份系统的自动实时处理系统能够在地震发生后几分钟之内自动确定出地震的3要素。分析2009年1月～2010年10月的自动定位结果后发现,282个4级以上地震的自动定位结果与中国地震台网中心(CENC)的人机交互速报结果(CC)匹配;70%的地震震级误差≤0.3;69%的国内及周边地区地震的震源水平位置定位误差≤20km,73%的国外地震的震源水平位置定位误差≤50km;国内及周边地区地震的平均速报时间为3.5min,国外地震平均为11.1min,该系统速报速度明显高于人机交互速报速度。全球6级以上地震中有284个的定位结果与欧洲-地中海地震学中心(EMSC)的实时定位结果匹配,其中49%的地震震级误差≤0.3;73%的地震水平误差不超过50km,68%的地震震源深度误差≤50km,对于震源深度大于300km的深源地震,90%的地震震源深度误差不超过50km。另对未匹配及误差较大的地震事件进行了进一步的分析。
An automatic real-time processing system of the Earthquake Administration of Guangdong Province is developed for the biggish earthquake events and installed as the backup system for the national earthquake rapid determination.The test running of the backup system started from the middle of December,2008,and then the official running was from July,2009.The system can automatically determine three main parameters of earthquake within a few minutes after an earthquake occurs.We analyze the results of earthquakes automatically located from January,2009 to October,2010,in which 282 earthquakes with magnitude larger than 4.0 can match the rapid reporting results of man-machine interactive earthquake location by CENC.The magnitude error of 70% matched events is within 0.3,the location error of 69% matched events which occurred inside or around nation is smaller than 20km,and the location error of 73% matched events which occurred abroad is within 50 km.The initial location results cost about 3.5 minutes on average after earthquakes occurred inside or around nation,the events occurring abroad are reported after 11.1 minutes,and the automatically determined location is clearly more rapid than man-machine interactive determined location.The 284 global earthquakes with magnitude larger than 6.0 can match the results of real-time determined location by EMSC,of which the magnitude error of 49% events is within 0.3,the horizontal error of 73% events is smaller than 50km,the depth error of 68% events is not more than 50km,and for the events whose depths are more than 300km the depth error of 90% events is within 50km.We also discussed the events which can not be matched or have large location error.
An automatic real-time processing system of the Earthquake Administration of Guangdong Province is developed for the biggish earthquake events and installed as the backup system for the national earthquake rapid determination.The test running of the backup system started from the middle of December,2008,and then the official running was from July,2009.The system can automatically determine three main parameters of earthquake within a few minutes after an earthquake occurs.We analyze the results of earthquakes automatically located from January,2009 to October,2010,in which 282 earthquakes with magnitude larger than 4.0 can match the rapid reporting results of man-machine interactive earthquake location by CENC.The magnitude error of 70% matched events is within 0.3,the location error of 69% matched events which occurred inside or around nation is smaller than 20km,and the location error of 73% matched events which occurred abroad is within 50 km.The initial location results cost about 3.5 minutes on average after earthquakes occurred inside or around nation,the events occurring abroad are reported after 11.1 minutes,and the automatically determined location is clearly more rapid than man-machine interactive determined location.The 284 global earthquakes with magnitude larger than 6.0 can match the results of real-time determined location by EMSC,of which the magnitude error of 49% events is within 0.3,the horizontal error of 73% events is smaller than 50km,the depth error of 68% events is not more than 50km,and for the events whose depths are more than 300km the depth error of 90% events is within 50km.We also discussed the events which can not be matched or have large location error.
引文
金星、廖诗荣、陈绯雯,2007,区域数字地震台网实时速报系统研究,地震地磁观测与研究,28(1),65～72。
宋锐、顾小虹、王永力等,2001,国家数字地震台网中心实时处理及大地震速报软件系统,地震,21(4),47～59。
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Winfried H,Andres H,Karl H J,2000,Networked Seismographs:GEOFON Real-Time Data Distribution,ORFEUS,Newsletter,December.
Wu Y M,Teng T L,2002,A virtual sub-network approach to earthquake early warning,Bull Seismol Soc Am,92(5),2008～2018.
宋锐、顾小虹、王永力等,2001,国家数字地震台网中心实时处理及大地震速报软件系统,地震,21(4),47～59。
Hiromitsu N,Shigeki H,Wu C J,et al,2009,Evaluation of the real-time earthquake information system in Japan,Geophys ResLett,36,L00B01,doi:10.1029/2008GL036470.
Johnson C E,Bittenbinder A,Bogaert B,et al,1995,Earthworm:A flexible approach to seismic network processing,IRISNewsletter,14(2),1～4.
Winfried H,Andres H,Karl H J,2000,Networked Seismographs:GEOFON Real-Time Data Distribution,ORFEUS,Newsletter,December.
Wu Y M,Teng T L,2002,A virtual sub-network approach to earthquake early warning,Bull Seismol Soc Am,92(5),2008～2018.
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