利用模板匹配技术识别大岗山水库库区爆破事件  

Identification of blasting event in reservoir area of Dagangshan by using the matched filter technology

作　　者：杜瑶[1] 阮祥[1] 戴仕贵[1] 邵玉平[1] 胥珍 余洋洋 罗勇 DU Yao;RUAN Xiang;DAI Shigui;SHAO Yuping;XU Zhen;YU Yangyang;LUO Yong(Sichuan Earthquake Agency,Chengdu 610041,China)

机构地区：[1]四川省地震局,成都610041

出　　处：《地震地磁观测与研究》2022年第1期42-50,共9页Seismological and Geomagnetic Observation and Research

基　　金：国家自然科学基金(项目编号:42074060);四川省科技计划项目(立项编号:2020YJ0184);国家自然科学基金(项目编号:U19A2098)。

摘　　要：采用匹配定位方法,利用大岗山水库库区及附近(29.2°—29.9°N,101.9°—102.5°E)5次已知爆破事件对2014年3月1日至2015年12月31日内连续波形进行模板检测与定位,经过人工复核后共获取23次疑爆事件,这些事件与模板事件间有较高的相关性,相关系数达0.7734,匹配后疑爆事件数为模板数的4.6倍,提高了对疑爆事件的识别率,同时剔除了原地震目录中人工误判的8次疑爆事件,有效地提高了地震编目质量。将匹配出来的疑爆事件及距离最近的台站记录到的NS向波形分别在Google Earth上投影,从影像图上可见扫描出的事件附近存在采石场或蓄水前修建大坝的场地,较符合爆破实际情况,重定位偏离量基本在0.5 km之内。研究认为,利用匹配定位的方法,能有效地区分不同类型的地震活动。In this paper,we adopt a match and location(M&L)method to carry out events detection and location for the continuous waveforms in the area of Dagangshan(29.2°—29.9°N,101.9°—102.5°E)from March 1,2014 to December 31,2015 by using 5 events listed in the network catalogue as templates.After the manual review,23 suspicious blasting events were obtained,which were of high relevant with the templates,with the correlation coefficient up to 0.7734.The number of events after detected was 4.5 times of the templates,and 8 suspicious blasting events which were artificial misjudged in the original earthquake catalogue were also eliminated,and the quality of earthquake catalogue was improved as well as the identification rate of the event number.By projecting the matched suspicious blasting events and waveforms recorded in the nearest station in NS direction to the Google Earth,we could see that there are quarries or site built for the dame before impounding around the scanned events,which were consistent with the actual blasting conditions,and the relocation deviation was basically within 0.5 km.The study results illustrate that the match and locate(M&L)method can effectively distinguish different types of seismic activity.

关 键 词：匹配定位 人工爆破 水库库区 

分 类 号：P315.9[天文地球—地震学] TV542[天文地球—固体地球物理学]