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Focal Mechanism and Focal Depth of the May 22, 2016 MS4.6 Earthquake in Chaoyang, Liaoning
Zhao Xing,Zhang Fan,Han Xiaoming,Wang Shubo,Wei Jianmin
作者单位
Zhao Xing Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010051, China 
Zhang Fan Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010051, China 
Han Xiaoming Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010051, China 
Wang Shubo Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010051, China 
Wei Jianmin Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010051, China 
摘要:
An earthquake with MS4.6 occurred at 17:08 p.m., May 22, 2016 in Chaoyang County, Liaoning Province. We used the P-wave first motion method, TDMT method, and CAP method to determine the focal mechanisms and the PTD method and sPn-Pn method to determine the focal depth. The focal mechanism results of the three methods are consistent. The depth results of the CAP method, PTD method and sPn-Pn method are close. We used the double difference location method to relocate earthquakes in 2009-2016, and obtained the strikes and dip angles of the small earthquake distributions with the help of simulated annealing algorithm and gauss Newton algorithm fitting. According to the focal mechanism results, the depth results, the characteristics of small earthquake distributions and the structural characteristics of the source area, the seismogenic fault strike is NEE and the main pressure force direction is NNW. The earthquake focal mechanism is for a normal fault type with a little left-lateral strike slip motion.
关键词:  Focal depth  Focal mechanism  The CAP method  The TDMT method  HypoDD
DOI:
分类号:
基金项目:This project was jointly sponsored by the Special Program of Youth Training for the National Seismological Network of CEA (20160506), and the Earthquake Science and Technology Spark Plan of CEA (XH14012Y).
Focal Mechanism and Focal Depth of the May 22, 2016 MS4.6 Earthquake in Chaoyang, Liaoning
Zhao Xing,Zhang Fan,Han Xiaoming,Wang Shubo,Wei Jianmin
Abstract:
An earthquake with MS4.6 occurred at 17:08 p.m., May 22, 2016 in Chaoyang County, Liaoning Province. We used the P-wave first motion method, TDMT method, and CAP method to determine the focal mechanisms and the PTD method and sPn-Pn method to determine the focal depth. The focal mechanism results of the three methods are consistent. The depth results of the CAP method, PTD method and sPn-Pn method are close. We used the double difference location method to relocate earthquakes in 2009-2016, and obtained the strikes and dip angles of the small earthquake distributions with the help of simulated annealing algorithm and gauss Newton algorithm fitting. According to the focal mechanism results, the depth results, the characteristics of small earthquake distributions and the structural characteristics of the source area, the seismogenic fault strike is NEE and the main pressure force direction is NNW. The earthquake focal mechanism is for a normal fault type with a little left-lateral strike slip motion.
Key words:  Focal depth  Focal mechanism  The CAP method  The TDMT method  HypoDD