Coseismic displacement field of the Wenchuan Ms 8.0 earthquake in 2008 derived using differential radar interferometry
Coseismic displacement field of the Wenchuan Ms 8.0 earthquake in 2008 derived using differential radar interferometry
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DOI：
10.1117/1.3386043
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发表时间：
2010
影响因子：
1.7
通讯作者：
C. Qu;X. Shan;Guohong Zhang;Xiaogang Song;Guifang Zhang
中科院分区：
文献类型：
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作者：
C. Qu;X. Shan;Guohong Zhang;Xiaogang Song;Guifang Zhang
利用日本ALOS/PALSAR卫星的雷达数据和D-InSAR技术，对2008年5月12日汶川8.0级地震的同震位移进行了反演。结果表明，同震位移主要集中在映秀-北川断裂两侧约100 km宽的近场范围内。断层附近长约250 km、宽约15~ 35 km的不整合带变形最大，地表破裂。不连续带两侧各有70 km宽的次级变形区，其位移量分别为北方下沉墙和南方隆起墙，最大值分别为-110~120cm和120~ 130 cm。在断层远场范围内，位移小于10 cm。利用炮检距追踪，我们发现了清晰的破裂痕迹和沿断层沿着约3 m的同震位移。利用四个断层段的模型，反演了断层上的滑动量分布。反演结果显示，映秀-北川断裂下5~ 20 km处有两次10 m的滑动，冠县-江油断裂下5~ 20 km处有一次2.3m的滑动。映秀-北川断裂带西南部和整个冠县-江油断裂带以逆冲断裂为主，映秀-北川断裂带东北部沿着以右行走滑为主。
We used the radar data from satellite ALOS/PALSAR of Japan and D-InSAR technology to derive the coseismic displacement produced by the Wenchuan, China Ms 8.0 earthquake on 12 May 2008. The result shows that the coseismic displacement primarily concentrated in a near-field range about 100km width on both sides of the Yingxiu-Beichuan fault. The incoherent zone about 250km long and 15~35km wide nearby the fault suffered the largest deformation with surface ruptures. The secondary deformed areas are 70km wide on each side of the incoherent zone, where the displacements exhibit a sunk northern wall with maximum -110~120cm and an uplifted southern wall with maximum 120~130cm, respectively. In the far-field range of the fault, displacements are less than 10cm. Using the offset tracking, we found clear rupture traces and coseismic displacement of 3m along the faults. With a model of four fault sections, we retrieved slip distribution on the faults. The inversion result reveals two slips of 10m at depths 5~20km beneath the Yingxiu-Beichuan fault and one slip of 2.3m at depth 5~20km below the Guanxian-Jiangyou fault, respectively. Thrust faulting dominates the southwestern Yingxiu-Beichuan fault and the entire Guanxian-Jiangyou fault, while right-slip is the primary component along the northeastern Yingxiu-Beichuan fault.