利用InSAR研究乌恰地震同震形变

STUDY ON COSEISMIC DEFORMATION OF WUQIA EARTHQUAKE USING INSAR DATA

2008年10月5日在新疆乌恰地区39.50°N、73.64°E处发生MW6.7地震,用ROI_PAC软件处理4景日本ALOS卫星数据得到乌恰地震的三维同震形变场。距离向,断层北侧最大位移达39 cm,南侧最大位移达36 cm;方位向,北侧和南侧的最大位移分别为1.5 m和2 m。采用Okada弹性位错模型分析该地震的滑动分布,模拟得出的断层走滑角为48°,倾滑角为53°,深度为10.5 km,最大形变量2.5 m,分析得出该地震为向北逆冲兼左旋走滑。

Using ALOS satellite data processed with ROI_PAC software, we got three-dimensional coseismic deformation field after Wuqia earthquake with Mw6.7 located at 39.50°N,73.64°E on October 5^th ,2008. The maximum displacement on range direction with north side was about 39 cm while south side was about 36 cm; the maximum displacement on azimuth with north side was about 1.5 m while with south side was about 2 m. According to simulation results for distribution of slide which using Okada elastic dislocation model, this earthquake belongs to sinistral strike slip and thrusting to north. The fault has a strike of 48° ,the slip angel is 53° ,the focal depth is 10.5 km and maximum displacement is 2.5 m.