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[1]ZHAO Jing,REN Jinwei,JIANG Zaisen,et al.Fault locking and Deformation Characteristics in Southwestern Segment of the Longmenshan Fault[J].Journal of Seismological Research,2018,41(02):216-225.

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Fault locking and Deformation Characteristics in Southwestern Segment of the Longmenshan Fault

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 41 Number of periods: 2018 02 Page number: 216-225 Column: Public date: 2018-04-20

Title:: Fault locking and Deformation Characteristics in Southwestern Segment of the Longmenshan Fault

Author(s):: ZHAO Jing¹; 2; REN Jinwei³; JIANG Zaisen³; LIU Xiaoxia³; NIU Anfu²; YAN Wei²; YUE Chong²; YUAN Zhengyi²; (1. State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China)(2. China Earthquake Networks Center,Beijing 100045,China)(3. CEA Key Laboratory of Earthquake Prediction,Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China)

Keywords:: the southwestern segment of the Longmenshan fault; fault locking; annual vertical change rate; the Wenchuan earthquake; the Lushan earthquake

CLC:: P315.725

DOI:: -

Abstract:: To study the dynamic characteristics of fault locking and deformation,and seismic risk in southwestern segment of the Longmenshan fault,we selected the negative dislocation model of DEFNODE to invert the spatial fault locking and fault slip deficit variations,by using GPS velocity field data during 1999-2007,2009-2011,2011-2013 and 2013-2015.and analyzed the 3-dimensional movement and deformation of the fault combining with the cross fault leveling data during 1990-2017.The results show that(1):The Wenchuan earthquake didn’t rupture the southwestern segment of the Longmenshan fault,which is always tightly locked. The Wenchuan earthquake accelerated strain accumulation of the southwestern segment and seismogenic process of the Lushan Earthquake. Fault locking of southwestern segment didn’t reduce obviously after the Lushan Earthquake. The Lushan earthquake didn’t release all the accumulated strain of the southwestern segment which is tightly locked,and the strain releasing was locall and limited.(2)The vertical fault slip deficits during four periods are all compressional. Slip deficit of the southwestern segment increased obviously after the Wenchuan earthquake,and then it decreased gradually. Slip deficit at present is much larger than that before the Wenchuan earthquake.(3)Annual vertical change rate reveals the southwestern segment of the Longmenshan fault is tightly locked before the Wenchuan earthquake. Several field rates increased obviously after the Wenchuan earthquake,then gradually decreased,and returned to normal at present. Combining GPS results and cross fault leveling results,we consider it is possible that major earthquakes happen in southwestern segment under the condition of its most segments tightly locked.

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Last Update: 2018-04-23