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A Study on the Seismic Velocity Changes before and after the 2016 MS6.4 Menyuan Earthquake Using the Active Source Data in the Qilian Mountain
Zou Rui,Guo Xiao,Zhang Yuansheng,Qin Manzhong,Yan Wenhua
作者单位
Zou Rui Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China 
Guo Xiao Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China 
Zhang Yuansheng Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China 
Qin Manzhong Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China 
Yan Wenhua Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China 
摘要:
The Qilian Mountain active source network data was processed using the methods of stacking, cross-correlation and interpolation, and the airgun travel time variation characteristics of P and S waves around the January 21, 2016 MS6.4 Menyua, Qinghai earthquake. The results show that about 6 months before the earthquake, the relative travel time of three stations near the epicenter showed a declined change (travel time decrease), and such a change of low value anomaly was recovered about 3 months before the earthquake. The travel time decrease then appeared again, and the earthquake occurred during the recovery process. The maximum decrease of the S-wave travel time was 18ms, and the change in travel time returned to normal after the earthquake. The variation trend of the 3 stations is consistent, including the S-wave travel time change of station ZDY38, which is nearest to the epicenter and changed obviously, and the variation range of the travel time is smaller at the stations afar. This variation pattern is related to the position of the seismic source. The shorter travel time means the velocity increase, which may be related to the regional stress accumulation.
关键词:  The Menyuan, Qinghai MS6.4 earthquake  Airgun excitation signal  Travel time delay  Wave velocity variation
DOI:
分类号:
基金项目:This project was jointly funded by the Sparkle Program of China Earthquake Administration (XH17039) and the Project on the Surface of the National Natural Science Foundation of China (41574044).
A Study on the Seismic Velocity Changes before and after the 2016 MS6.4 Menyuan Earthquake Using the Active Source Data in the Qilian Mountain
Zou Rui,Guo Xiao,Zhang Yuansheng,Qin Manzhong,Yan Wenhua
Abstract:
The Qilian Mountain active source network data was processed using the methods of stacking, cross-correlation and interpolation, and the airgun travel time variation characteristics of P and S waves around the January 21, 2016 MS6.4 Menyua, Qinghai earthquake. The results show that about 6 months before the earthquake, the relative travel time of three stations near the epicenter showed a declined change (travel time decrease), and such a change of low value anomaly was recovered about 3 months before the earthquake. The travel time decrease then appeared again, and the earthquake occurred during the recovery process. The maximum decrease of the S-wave travel time was 18ms, and the change in travel time returned to normal after the earthquake. The variation trend of the 3 stations is consistent, including the S-wave travel time change of station ZDY38, which is nearest to the epicenter and changed obviously, and the variation range of the travel time is smaller at the stations afar. This variation pattern is related to the position of the seismic source. The shorter travel time means the velocity increase, which may be related to the regional stress accumulation.
Key words:  The Menyuan, Qinghai MS6.4 earthquake  Airgun excitation signal  Travel time delay  Wave velocity variation