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《Chinese Journal of Geophysics》 2012-10
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Two-dimensional displacement field of the Wenchuan earthquake inferred from SAR intensity offset-tacking

LIU Yun-Hua,QU Chun-Yan,SHAN Xin-Jian State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China  
In this paper,the sub-pixel offset-tracking method and ALOS image are used to map the Wenchuan earthquake rupture and to identify the faults activated by the earthquake.The results indicate that the Wenchuan earthquake produced at least two surface ruptures on the Longmenshan fault,the main rupture is named Beichuan—Yingxiu rupture(Longmenshan town—Gaochuan rupture in this map) and the secondary named Hanwang rupture.The former extends about 240 km along Longmenshan fault and is characterized by dextral-slip thrusting with horizontal displacement 4~6 m on average and a pull apart terrace about 8 km wide near Gaochuan town.The latter is 12 km south of the former,extending from Xuankou town to Xiushui town,about 100 km long.The maximum displacement about 3~4 m appears near Bailu town.A rupture named Xiaoyudong is located between the two ruptures before mentioned with NW-SE striking,and extends about 10 km,the maximum vertical displacement in this rupture is about 3~4 m.The research indicates that offset-tracking using SAR intensity image can be a powerful complement to differential radar interferometry and field research,which has severe limitations that are mainly due to data decorrelation and signal saturation,and it does not generally provide measurements in the near-fault area where large displacements occur.If we combine such methods together,a more realistic fault model can be established,which will contribute to the comprehension of the complicated rupture process in the Wenchuan earthquake.
【Fund】: 国家自然科学基金(40874006)、国家自然科学基金国际合作项目(41111140386)共同资助;; 中国地震局地质研究所基本科研业务专项(IGCEA1104)项目
【CateGory Index】: P315
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