2023年甘肃积石山M_(S)6.2地震目录完备性研究  

Completeness of the earthquake catalog of the 2023 Jishishan M_(S)6.2 earthquake in Gansu Province

作　　者：温淑琳 刘旭宙[1,2] 秦满忠 刘白云[2] 康斌龙 吴柏辰 WEN Shulin;LIU Xuzhou;QIN Manzhong;LIU Baiyun;KANG Binlong;WU Baichen(Lanzhou Institute of Seismology,CEA,Lanzhou 730000,Gansu,China;Gansu Lanzhou Geophysics National Observation and Research Station,Lanzhou 730000,Gansu,China)

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]甘肃兰州地球物理国家野外科学观测研究站,甘肃兰州730000

出　　处：《地震工程学报》2024年第4期924-931,共8页China Earthquake Engineering Journal

基　　金：甘肃省科技重大专项(21ZD4FA011);国家自然科学基金重点项目(42230305);国家重点研发计划课题(2018YFC1503206)。

摘　　要：2023年积石山M_(S)6.2地震是典型的“主-余震”型地震,主震后存在大量余震,余震波形相互重叠、难以区分,造成地震目录不完善。为完善该地震的目录,选取震中附近流动台站和固定数字测震台站震后21 d观测到的波形数据,利用模板匹配方法对地震序列重新检测,共得到1412个地震事件,是测震台网地震数量的1.8倍。根据补充后的地震目录,计算出积石山地震目录最小完整性震级为M_(L)1.0,b值为0.74左右。对积石山震源区地震目录的完备性进行补充,有助于分析该地区地震活动的时空分布特征,并为地震危险性、地震活动性和地震预测等研究提供基础资料。As a“main-aftershock”type earthquake,the 2023 Jishishan M_(S)6.2 earthquake induces numerous aftershocks after the mainshock.The overlapping waveforms of aftershocks increase the difficulty of their classification,resulting in an incomplete seismic catalog.Waveform data within 21 days after the Jishishan M_(S)6.2 mainshock were selected from seismic and digital seismograph stations near the epicenter to complete the seismic catalog of this earthquake.The earthquake sequence was re-detected using the template-matching method,and a total of 1412 seismic events were obtained,which was 1.8 times the number of earthquakes recorded by the seismic network.Based on the template-matching detected seismic catalog,the minimum magnitude of completeness(M c)of the aftershocks in Jishishan was estimated to be M_(L)1.0,and the calculated b-value was around 0.74.The completeness of the seismic catalog in the Jishishan area will help analyze the spatial and temporal distribution characteristics of seismicity,thus providing basic information for investigating the seismic hazard,seismic activity,and earthquake prediction in this area.

关 键 词：积石山M_(S)6.2地震 模板匹配 地震目录完备性 B值 

分 类 号：P315[天文地球—地震学]