摘要
2023年6月15日1时39分上海市青浦区发生M3.1地震。上海地震预警台网成功接收中国地震预警网发布的地震预警信息,本地部署的福建预警系统EEW也成功处理并产出了本次地震预警结果。本文对上海地震预警系统产出的7次地震预警处理结果,以及中国地震预警网发布的地震预警信息进行比对分析。此次地震震中位于上海地震预警网内,震后6.8 s发布首次预警信息,全部7次预警处理结果均在震后15 s内产出。与正式地震目录相比,第一次预警处理结果震中位置偏差为5 km,震级偏差为−0.1。随着参与计算的预警台站数量增多,震中位置最终与正式目录一致,震级偏差也保持在0.5。本次地震预警结果表明,上海及周边地区虽然属于地震活动主要以小微震为主的预警一般区,但是由于预警台站密度较大,发生地震后也可以在较短时间内产出比较精确的预警处理结果,这对正在进行的长三角监测预警业务一体化工作具有重要参考意义。
A M3.1 earthquake occurred in Qingpu District of Shanghai at 1:39 on June 15,2023.The Shanghai Earthquake Early Warning Network successfully received the earthquake early warning information released by the China Earthquake Early Warning Network,and the locally deployed Fujian Early Warning System EEW also successfully processed and produced the earthquake early warning results.In this paper,the results of 7 earthquake early warnings produced by Shanghai Earthquake Early Warning System and the earthquake early warning information released by China Earthquake Early Warning Network are compared and analyzed.The epicenter of the earthquake is located in the Shanghai Earthquake Early Warning Network.The first early warning information was released at 6.8 s after the earthquake.All 7 early warning processing results were produced within 15 s after the earthquake.Compared with the official earthquake catalogue,the first early warning processing result has an epicentral position deviation of 5 km and a magnitude deviation of−0.1.With the increase of the number of early warning stations involved in the calculation,the epicenter position is finally consistent with the official catalogue,and the magnitude deviation is also maintained at 0.5.The results of this earthquake early warning show that although Shanghai and its surrounding areas belong to the general early warning area with small and micro earthquakes as the main seismic activities,due to the large density of early warning stations,more accurate early warning processing results can also be produced in a short time after the earthquake,which is of great reference significance for the ongoing integration of monitoring and early warning business in the Yangtze River Delta.
作者
邵永谦
王成睿
魏薇
王鹏
毕波
Shao Yongqian;Wang Chengrui;Wei Wei;Wang Peng;Bi Bo(Shanghai Earthquake Agency,Shanghai 200062,China;Shanghai Sheshan National Geophysical Observatory and Research Station,Shanghai 200062,China)
出处
《地震科学进展》
2024年第8期532-542,共11页
Progress in Earthquake Sciences
基金
上海市科委项目(23DZ1200200)
中国地震局地震科技星火计划(XH21010Y)共同资助
关键词
地震预警
上海青浦M3.1地震
预警处理结果分析
长三角监测预警一体化
earthquake early warning
Shanghai Qingpu M3.1 earthquake
analysis of early warning processing results
earthquake monitoring and early warning integration
