利用气枪震源信号研究2016年云龙M_S 5.0地震前后波速变化特征  

Study on Travel Time Variation of the Wave from Large Volume Air-gun Source before and after the 2016 Yunlong M_S5.0 Earthquake

作　　者：陈佳[1] 叶泵[1] 高琼[1] 王军[1] 李孝宾[1] 杨军[1] CHEN Jia;YE Beng;GAO Qiong;WANG Jun;LI Xiaobin;YANG Jun(Western Yunnan Earthquake Prediction Study Area,China Earthquake Administraion,Dali 671000,Yunnan,China)

机构地区：[1]中国地震局滇西地震预报实验场,云南大理671000

出　　处：《地震研究》2017年第4期550-556,共7页Journal of Seismological Research

基　　金：国家自然科学基金资助项目(41474048);云南省青年基金科学项目(201506);2017年度震情跟踪定向工作任务(2017010309);云南省陈颙院士工作站专项金费共同资助

摘　　要：以2016年5月18日云南云龙MS5.0地震为例,选取距震中较近的3个台站和较远的5个台站记录的2016年1—9月的气枪震源信号,使用互相关检测技术得到地震前后这8个台站各自稳定震相走时变化特征。结果表明:云龙地震前,各台均存在不同程度的走时异常变化。离震中较近的3台站中,震中西侧和东侧台站走时变化有一定差别,但都在地震前的3、4月变化较大;而离地震较远的5个台站则变化趋势特征一致,幅度略有差别;离地震较近台站走时变化幅度明显大于离地震较远台站;地震前小于0.7 m的水位变化并未对各台走时变化产生实质性影响。同时对比了云龙台FSQ水管倾斜的形变观测数据,监测到同一时段地下应力发生变化。Taken the Yunnan Yunlong MS50earthquake as an example,we chose the airgun signal data recorded by three seismic stations near the epicenter of the Yunlong earthquake and five seismic stations which is a bit further from the epicenterbetween January and September2016We studied travel time variety characteristics of the eight seismic stations by using cross-correlation time delay measurement technology The results show that the travel time of every station had abnormal variation before the earthquake For the three near stations,the travel time from the eastern and western of the earthquake was different,but they all had larger changes in March and April For the five further stations,the trend characteristics were consistent,but the range was different The change of the travel time from the near seismic stations is more lager than the far seismic stations Before the earthquake,less than07m of water level change cant make a substantial change on travel time Compared with the crustal deformation observation data of the FSQ water pipe tilt in Yunlong seismic station,we observed stress changes occurred in the same period of time

关 键 词：气枪震源 互相关检测技术 走时变化 云龙MS5.0地震 

分 类 号：P315.31[天文地球—地震学]