台湾海峡M_(S)6.2地震的微震检测定位及其发震断裂  

Microseismic Detection and Location of the M_(S)6.2 Earthquake in Taiwan Strait and Its Seismogenic Fault

作　　者：胡淑芳[1] 李军[1] 李强[1] 许振栋[2] HU Shufang;LI Jun;LI Qiang;XU Zhendong(Fujian Earthquake Agency,Fuzhou 350000,China;Pingtan Seismic Station,Fujian Earthquake Agency,Pingtan 350400,China)

机构地区：[1]福建省地震局,福州350000 [2]福建省地震局平潭地震台,福建平潭350400

出　　处：《华南地震》2022年第3期1-8,共8页South China Journal of Seismology

基　　金：中国地震局监测、预报、科研三结合项目(3JH-202001048);中国地震局地震科技星火计划攻关项目(XH21015);国家自然科学基金面上项目(41774068)联合资助。

摘　　要：基于模板匹配定位(M&L)对2018年11月26日台湾海峡M_(S)6.2地震进行遗漏地震的检测与定位。选取10个M_(L)3.0以上余震作为模板,对震前一天和震后一年内的连续波形进行检测,截止到2019年11月26日,福建台网共记录定位的地震183次,经M&L方法检测定位后的地震750个,约为福建台网目录的4倍,未发现前震,最小完备性震级由M_(L)2.4降到了M_(L)1.9。地震目录完整性的明显改善,为研究该地震序列活动性及确定其发震断层提供了数据基础。检测定位后的地震空间分布沿东西向优势展布,但无具体已探明的断裂构造与之对应,因震区位于台湾海峡南部海域地区,并结合主震震源机制解,不排除该区存在未探明的东西向断裂构造。Based on template matching and localization(M&L),the paper detects and locates the missed earthquakes in the Taiwan Strait M_(S)6.2 earthquake on November 26^(th),2018.This paper chooses 10 aftershocks with M_(L)>3.0 as the templates and detects continuous waveforms one day before the earthquake and one year after the earthquake.As of November 26^(th),2019,the Fujian seismic network recorded 183 earthquakes,and finally detected 750 missing earthquakes after M&L method detection,which was about 4 times of the catalogue of the Fujian seismic network.No foreshocks were found,and the minimum magnitude of completeness was reduced from M_(L)2.4 to M_(L)1.9.The improvement of the completeness of the earthquake catalogue provides data base for studying the earthquake sequence activity and determining the seismogenic fault.The spatial distribution of earthquakes after detection and location is dominantly distributed along the east-west direction,but there is no specific identified fault structure corresponding to it.Because the earthquake area is located in the southern waters of the Taiwan Strait,and combined with the focal mechanism of the mainshock,it cannot be ruled out that there are undiscovered east-west fault structures in this area.

关 键 词：台湾海峡M_(S)6.2地震 匹配定位 微震探测定位 目录完整性 发震断层 

分 类 号：P315.2[天文地球—地震学]