Abstract: After the May 12,2008 M_S 8 Wenchuan earthquake,we extract the high-precision deformation data covering the whole quake-stricken area(～500km×350km)by using SAR Interferometry approach(InSAR),which provides important information for the earthquake mechanism research.By analyzing InSAR imaging geometry and the characteristics of ALOS PALSAR data,we get some qualitative knowledge of the Wenchuan earthquake.This work provides helpful information for the related research and a basis for the following quantitative inversion of the earthquake rupture.The InSAR application of this earthquake shows the scientific significance of satellite geodesy to earthquake research.

Key words: M_S8.0 Wenchuan earthquake, co-seismic deformation, SAR Interferometry

摘要： 2008年5月12日汶川M_S8.0地震发生后,通过干涉雷达方法(InSAR)获得了覆盖整个灾区全面的高精度形变观测资料(约500km×350km),为研究该地震的发生机理提供了重要的观测依据。通过分析InSAR成像几何和ALOS PALSAR数据的特点,初步获得了对汶川地震的定性认识,为相关研究提供参考,也为进一步深入定量反演奠定基础。此次地震中InSAR卫星观测的应用,显示了卫星大地测量手段对于地震科学研究的重要意义。

关键词: 汶川M_S8.0地震, 同震形变, 干涉雷达