• You are welcome to ERC!
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 90次   下载 112 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Study of the Change in Wave Velocity Ratio before and after Two Strong Earthquakes Using Airgun Source Data
LIU Zifeng1, YE Beng2, CHEN Jia2, ZHOU Qingyun1, WANG Guangming1, PENG Guanling1, LI Yongli1
1.Yunnan Earthquake Agency, Kunming 650224, China;2.Office of the Western Yunnan Earthquake Prediction Study Area, China Earthquake Administration, Dali 671000, Yunnan, China
摘要:
Using the signals excited by the large-volume airgun source at the Binchuan transmitting seismic station from January to June, 2016, arrival-time data was acquired at four stations near the epicenter of the Eryuan MS4.5 and MS4.0 earthquakes on February 8, 2016, as well as the epicenter of the Yunlong MS5.0 and Eryuan MS4.6 earthquakes on May 18, 2016 through the waveform cross-correlation technique. The wave velocity ratio of the four stations was calculated using the single-station method. At the same time, the b-value and the focal mechanism consistency parameters of the study area were also calculated. The results show that:(1) the wave velocity ratio of each station experienced a process of decline-recovery-fast rise before the two strong earthquakes, and a significant quasi-synchronous rapid rise occurred within 3-12 days before the earthquake; (2) the timing of the rapid rise of the wave velocity ratio of the four stations before the Yunlong MS5.0 and Eryuan MS4.6 earthquakes were related to the epicentral distance. The station which observed the earliest increase in rapid rise is the farthest one from the epicenter, and the station where the rapid rise appeared in the latest is closest to the epicenter; (3) the form of change of the wave velocity ratio before the earthquake was different between stations located at different directions in the epicenter area; (4) the b-value and the focal mechanism consistency parameter which is commonly used to characterize the stress level both showed a downward trend before the two strong earthquakes, and were consistent with the change in the wave velocity ratio. According to the preliminary analysis, the wave velocity ratio obtained by using airgun source can better reflect the change in the stress state of the underground medium.
关键词:  Airgun source  Wave velocity ratio  b-value  Focal mechanism consistency
DOI:10.19743/j.cnki.0891-4176.201902012
分类号:
基金项目:This project is sponsored by the subproject of Relocation of Earthquakes in Yunnan Area under the project of the Major Seismicity Trend in 2019 of Department of Monitoring and Prediction of CEA, the National Natural Science Foundation of China(41474048, 41574059), and the Science for Earthquake Resilience of China Earthquake Administration (XH18042Y).
Study of the Change in Wave Velocity Ratio before and after Two Strong Earthquakes Using Airgun Source Data
LIU Zifeng1, YE Beng2, CHEN Jia2, ZHOU Qingyun1, WANG Guangming1, PENG Guanling1, LI Yongli1
1.Yunnan Earthquake Agency, Kunming 650224, China;2.Office of the Western Yunnan Earthquake Prediction Study Area, China Earthquake Administration, Dali 671000, Yunnan, China
Abstract:
Using the signals excited by the large-volume airgun source at the Binchuan transmitting seismic station from January to June, 2016, arrival-time data was acquired at four stations near the epicenter of the Eryuan MS4.5 and MS4.0 earthquakes on February 8, 2016, as well as the epicenter of the Yunlong MS5.0 and Eryuan MS4.6 earthquakes on May 18, 2016 through the waveform cross-correlation technique. The wave velocity ratio of the four stations was calculated using the single-station method. At the same time, the b-value and the focal mechanism consistency parameters of the study area were also calculated. The results show that:(1) the wave velocity ratio of each station experienced a process of decline-recovery-fast rise before the two strong earthquakes, and a significant quasi-synchronous rapid rise occurred within 3-12 days before the earthquake; (2) the timing of the rapid rise of the wave velocity ratio of the four stations before the Yunlong MS5.0 and Eryuan MS4.6 earthquakes were related to the epicentral distance. The station which observed the earliest increase in rapid rise is the farthest one from the epicenter, and the station where the rapid rise appeared in the latest is closest to the epicenter; (3) the form of change of the wave velocity ratio before the earthquake was different between stations located at different directions in the epicenter area; (4) the b-value and the focal mechanism consistency parameter which is commonly used to characterize the stress level both showed a downward trend before the two strong earthquakes, and were consistent with the change in the wave velocity ratio. According to the preliminary analysis, the wave velocity ratio obtained by using airgun source can better reflect the change in the stress state of the underground medium.
Key words:  Airgun source  Wave velocity ratio  b-value  Focal mechanism consistency