%0 Journal Article
%T 甘肃张掖M5.0地震前气枪信号走时变化研究<br>Travel Time Changes of the Airgun Signal before the Zhangye M5.0 Earthquake in Gansu Province
%A 刘志国
%A 张元生
%A 邹锐
%A 刘旭宙
%J 地震工程学报
%D 2019
%R 10.3969/j.issn.1000-0844.2019.06.1402
%X 利用祁连山主动源观测系统记录的气枪激发信号资料，通过滤波、叠加、反褶积、互相关等处理，获得了观测系统各台站P波不同震相走时变化数据，发现2019年9月16日张掖M5.0地震前震源区附近台站存在一定的P波走时变化，表明震源区地下结构在震前存在应力状态的改变。<br>Using air gun excitation signal data recorded by the active source observation system in the Qilian Mountain, travel-time change data of the P-wave phases before the Zhangye M5.0 earthquake on September 16, 2019 were obtained at each station of the observation system. Filtering, stacking, deconvolution, cross-correlation, and other data processing were performed. Clear velocity variations were found at the stations near the focal area before the earthquake. These results showed that the stress state of the underground structures in the focal area had changed in the months leading up to the earthquake
%K 甘肃张掖M5.0地震
%K 祁连山主动源观测系统
%K 互相关
%K 波速变化<br>Zhangye
%K Gansu M5.0 earthquake
%K active source observation system in Qilian Mountains
%K cross correlation
%K velocity variation
%U http://dzgcxb.ijournals.cn/ch/reader/view_abstract.aspx?file_no=20190604&flag=1