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Journal: |
Earthquake Science 2009 No.6
clicks:816 |
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Title:
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Author:
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Qingliang Wang; Duxin Cui; Xi Zhang; Wenping Wang; Jinwen Liu; Kang Tian; Zhaoshan Song |
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Adress: |
Second Monitoring Center,China Earthquake Administration,Xi’an 710054,China |
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Abstract:
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The devastating MS8.0 Wenchuan earthquake ruptured two large parallel thrust faults along the middle segment of the Longmenshan thrust belt.Preseismic and postseismic leveling data indicated the hanging wall of the YingxiuBeichuan-Nanba thrust fault mainly presented coseismic uplift with respect to the reference point at Pingwu county town, and the observed maximum uplift of 4.7 m is located at Beichuan county(Qushan town)which is about 100 m west of the fault scarp.The foot wall of the Yingxiu-Beichuan-Nanba thrust fault mainly showed subsidence with maximum subsidence of 0.6 m near the rupture.By employing a listric dislocation model,we found that the fault geometry model of exponential dip angleδ=88°×[1-exp(-9/h)]with depth of 18 km and uniform thrust-slip of 5.6 m could fit the observed coseismic vertical deformation very well,which verifies the listric thrust model of the Longmenshan orogenic zone. |
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Comment: |
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