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《Seismology and Geology》 2012-04
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FUYUN FAULT: LONG-TERM FAULTING BEHAVIOR UNDER LOW CRUSTAL STRAIN RATE

XU Xi-wei1) SUN Xin-zhe1) TAN Xi-bin1) LI Kang1) YU Gui-hua1) Marie Etchebes2) Yann Klinger2) Paul Tapponnier3) J.Van Der Woerd4) 1)Key Laboratory of Active Tectonics and Volcano,Institute of Geology, China Earthquake Administration, Beijing 100029,China 2)Tectonics,Institut de Physique du Globe de Paris,Sorbone Paris Cité,CNRS 3)Earth Observatory of Singapore,Singapore 4)Institut de Physique du Globe,Strasbourg,France  
The Fuyun Fault is a typical right-lateral strike-slip fault in Altay region where the crustal strain rate is very low. Field observations and restoration of horizontal offsets from the 3D LiDAR data obtained from 3 sites along the Funyun Fault further confirm that the average coseismic right-lateral slip of the 1931 Fuyun earthquake is (6.3±1.2)m,and the slip distribution is unusually flat over its entire length of the Fuyun Fault. The maximum slip is only (6.7±0.5)m under the Karaxingar Range,near to the central part of the surface rupture zone other than 10m to 14m as reported before. Co-located larger offsets,interpreted as cumulative offsets,allow us to define at least 4 more events in addition to the most recent. The cumulative slip distribution of each event seems to follow a similar flat pattern,supporting a characteristic earthquake model interpretation for the 5 last events. Several successive offset landforms are dated at 2 sites by cosmogenic dating method (10Be)to constrain the long-term right-lateral slip rate of (0.76±0.24)mm/a. An average characteristic slip of 6.3m,a maximum slip of ~6.7m and a slip rate of (0.76±0.24)mm/a yield a recurrence interval of (9 700±3 300)a. Then,great earthquakes on the Fuyun Fault,a right-lateral strike-slip fault follow a characteristic slip behavior with a low long-term slip rate and long recurrence interval,which is a faulting response to the far-field strain resulting from the collision between the Indian and Eurasian plates.
【Fund】: 国家自然科学基金(40974057和40821160550)资助
【CateGory Index】: P315.2
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