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A Preliminary Analysis of the Seismogenic Structure of the Akto MS6.7 Earthquake Sequence on November 25, 2016
LIANG Shanshan1, XU Zhiguo2,3, CHEN Hongfeng1, ZOU Liye1, LIU Jingguang1
1.China Earthquake Networks Center, China Earthquake Administration, Beijing 100045, China;2.Key Laboratory of Marine Disaster Prediction Technology, National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China;3.Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, CAS, Beijing 100049, China
摘要:
In this study, data from the Xinjiang regional network and IRIS shared global stations are used to relocate the Akto MS6.7 earthquake sequence on November 25, 2016 by using double difference location method. Three earthquakes of MS4.8, MS6.7 and MS5.0 are inverted by using the gCAP method, and the focal mechanism solutions are obtained. According to the results of relocating, the location of the main shock is 39.22°N, 73.98°E, the distribution of the earthquake sequence is about 70km in length, and the focal depth is mainly within the range of 5-20km. The plane and depth profiles of the earthquake sequence show that aftershocks extended in SEE direction after the main shock and the dip angle of fault plane is steep. Focal mechanism results show that the three earthquakes are characterized by strike-slip movement. Based on the results of field geological investigation, it is inferred that the seismogenic fault of the Akto earthquake is Muji fault, which is located at the northernmost end of the Kongur extensional system. The possible cause of this earthquake is that the Indian Plate continues to push northward, and during this compression process, the Indian Plate is affected by the clockwise rotation of the Tarim basin, which causes the accumulation of right-lateral action of the Muji fault, resulting in this earthquake.
关键词:  Akto MS6.7 earthquake  Earthquake location  Focal mechanism  Muji fault  Kongur extensional system
DOI:10.19743/j.cnki.0891-4176.201903011
分类号:
基金项目:This project is Co-sponsored by the Seismological Science and Technology Spark Program (XH19053) and the Regular Project "Operation and Maintenance of the National Automatic Reporting Center (CSN/GSN) and System Optimization".
A Preliminary Analysis of the Seismogenic Structure of the Akto MS6.7 Earthquake Sequence on November 25, 2016
LIANG Shanshan1, XU Zhiguo2,3, CHEN Hongfeng1, ZOU Liye1, LIU Jingguang1
1.China Earthquake Networks Center, China Earthquake Administration, Beijing 100045, China;2.Key Laboratory of Marine Disaster Prediction Technology, National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China;3.Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, CAS, Beijing 100049, China
Abstract:
In this study, data from the Xinjiang regional network and IRIS shared global stations are used to relocate the Akto MS6.7 earthquake sequence on November 25, 2016 by using double difference location method. Three earthquakes of MS4.8, MS6.7 and MS5.0 are inverted by using the gCAP method, and the focal mechanism solutions are obtained. According to the results of relocating, the location of the main shock is 39.22°N, 73.98°E, the distribution of the earthquake sequence is about 70km in length, and the focal depth is mainly within the range of 5-20km. The plane and depth profiles of the earthquake sequence show that aftershocks extended in SEE direction after the main shock and the dip angle of fault plane is steep. Focal mechanism results show that the three earthquakes are characterized by strike-slip movement. Based on the results of field geological investigation, it is inferred that the seismogenic fault of the Akto earthquake is Muji fault, which is located at the northernmost end of the Kongur extensional system. The possible cause of this earthquake is that the Indian Plate continues to push northward, and during this compression process, the Indian Plate is affected by the clockwise rotation of the Tarim basin, which causes the accumulation of right-lateral action of the Muji fault, resulting in this earthquake.
Key words:  Akto MS6.7 earthquake  Earthquake location  Focal mechanism  Muji fault  Kongur extensional system