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[1]QU Yong,ZHU Hang.Coulomb Stress Triggering Process of Major Earthquake Sequence in the Eastern and Southern Boundaries of the Bayan Har Block[J].Journal of Seismological Research,2017,40(02):216-225.

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Coulomb Stress Triggering Process of Major Earthquake Sequence in the Eastern and Southern Boundaries of the Bayan Har Block

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 40 Number of periods: 2017 02 Page number: 216-225 Column: Public date: 2017-04-23

Title:: Coulomb Stress Triggering Process of Major Earthquake Sequence in the Eastern and Southern Boundaries of the Bayan Har Block

Author(s):: QU Yong; ZHU Hang; (Earthquake Administration of Sichuan Province,Chengdu 610041,Sichuan,China)

Keywords:: Bayan Har block; coulomb stress change; static stress triggering; major earthquake sequence

CLC:: P315.727

DOI:: -

Abstract:: In this paper,we calculate and map the patterns of Coulomb static stress changes induced by a major earthquake sequence of 9 M_S≥6.3 events in the eastern and southern boundary fault zones of the Bayan Har block from 1973 to 2014,and analyze the effects of stress triggering induced by the preceding events to the following events. The results show that,firstly,there is a significant stress triggering relationship in the 4 major earthquakes occurred on Huya fault zone in the eastern boundary of the Bayan Har block from 1973 to 1976,besides,it changed the stress state of the middle-south segment of Longmenshan fault zone as well as surrounding areas,and triggered Wenchuan M_S8.0 earthquake and Lushan M_S7.0 earthquake one after another; Secondly,there is also coulomb stress triggering relationship existed in the 3 major earthquakes occurred on Xianshuihe fault zone in the southern boundary of Bayan Har block since 1973,and 2014 Kangding M_S6.3 earthquake is a common triggering result of coulomb stress change induced by strong earthquake activities in both Bayan Har block’s eastern and southern boundaries; Thirdly,the patterns of coulomb stress change caused by the 9 earthquake in the sequence show that,the seismic gap between Wenchuan earthquake and Lushan earthquake in south segment of Longmenshan fault zone,the seismic gap between Daofu earthquake and Kangding earthquake in Xianshuihe fault zone,and the junction region of Xianshuihe-Anninghe-Longmenshan fault zones are all in the increased zone of Coulomb stress changes,thus their future earthquake risks are worth concern.

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Last Update: 2017-06-10