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3D P-wave Velocity Structure and Active Tectonics in the Xinfengjiang Area of Guangdong
Ye Xiuwei,Huang Yuanmin,Liu Jiping
Author NameAffiliation
Ye Xiuwei Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Earthquake Administration of Guangdong Province, Guangzhou 510070, China 
Huang Yuanmin Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Earthquake Administration of Guangdong Province, Guangzhou 510070, China 
Liu Jiping Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, Earthquake Administration of Guangdong Province, Guangzhou 510070, China 
摘要:
In this paper, we determined an earthquake sequence location in the Xingfengjiang area from June, 2007 to July, 2014 and the 3D P-wave velocity structure by a simultaneous inversion method. On that basis, we studied the occurrence features of active tectonics and the earthquake source mechanism. The results show that the reservoir fracture system has a tendency to increase with gradual depth from southeast to northwest, consistent with gravitational field research results. There are 4 high velocity zones (HVZ) under the depth of the 7km -12km crust between the Xinfengjiang Reservoir dam and Xichang District,Dongyuan. The max velocity of the biggest HVZ which is under Xichang is 6.3km/s. Under the reservoir dam there is a strong tectonic deformation zone, as the center exit Renzishi fault (F2), Nanshan-Aotou faults (F4), Heyuan fault (F1) and Shijiao-Xingang-Baitian fault (F5), 7 earthquakes with ML ≥ 5.0 (including M6.1 in March, 1962) occurred at the high gradient zone of the HVZ Ⅲ and HVZ Ⅳ edge which has been under the reservoir dam since 1960, with relativity energy releasing more thoroughly. Moderate seismic activity occurred at the HVZ Ⅰ edge which has been under Xichang since 2012, and is a danger zone for M5.0 earthquakes in the future.
关键词:  P-wave velocity structure  Active tectonics  Simultaneous inversion method  The Xinfengjiang reservoir
DOI:
分类号:
基金项目:This project was jointly sponsored by the National Natu-ral Science Foundation of China (41676057) and the Scientific Program of Guangdong Province (2012A030200005).
3D P-wave Velocity Structure and Active Tectonics in the Xinfengjiang Area of Guangdong
Ye Xiuwei,Huang Yuanmin,Liu Jiping
Abstract:
In this paper, we determined an earthquake sequence location in the Xingfengjiang area from June, 2007 to July, 2014 and the 3D P-wave velocity structure by a simultaneous inversion method. On that basis, we studied the occurrence features of active tectonics and the earthquake source mechanism. The results show that the reservoir fracture system has a tendency to increase with gradual depth from southeast to northwest, consistent with gravitational field research results. There are 4 high velocity zones (HVZ) under the depth of the 7km -12km crust between the Xinfengjiang Reservoir dam and Xichang District,Dongyuan. The max velocity of the biggest HVZ which is under Xichang is 6.3km/s. Under the reservoir dam there is a strong tectonic deformation zone, as the center exit Renzishi fault (F2), Nanshan-Aotou faults (F4), Heyuan fault (F1) and Shijiao-Xingang-Baitian fault (F5), 7 earthquakes with ML ≥ 5.0 (including M6.1 in March, 1962) occurred at the high gradient zone of the HVZ Ⅲ and HVZ Ⅳ edge which has been under the reservoir dam since 1960, with relativity energy releasing more thoroughly. Moderate seismic activity occurred at the HVZ Ⅰ edge which has been under Xichang since 2012, and is a danger zone for M5.0 earthquakes in the future.
Key words:  P-wave velocity structure  Active tectonics  Simultaneous inversion method  The Xinfengjiang reservoir