【摘要】 利用ENVISAT/ASAR和ALOS/PALSAR数据,结合两路差分干涉测量技术获得了汶川地震的同震形变信息和震前、震后地面在卫星视线(light of sight,简称LOS)方向上的形变特征。结果表明,汶川地震引起的地面形变范围广,程度大,地震形变沿断层向北北东向扩展,所形成的差分干涉条纹明显。地面的形变特征对于推断断层的性质,研究地震形变和地震发育特征具有重要的参考价值。另外,将同震雷达差分干涉测量的结果与利用USGS发布的汶川地震有限元断层模型(finite fault model)反演的LOS方向的形变进行了对比验证,发现二者在断裂带的上盘具有较好的一致性,但在下盘却有较大的误差。通过不同传感器干涉结果的对比发现,L波段的雷达干涉结果更能够反映汶川大地震在龙门山断裂带附近的地面形变信息。更多还原

【Abstract】 Satellite differential SAR interferometry has been widely accepted as a powerful tool to map co-,post-and inter-seismic deformation.In this study,ENVISAT/ASAR and ALOS/PALSAR datasets are used for monitoring the ground displacement of the Wenchuan MS 8.0 earthquake in China with two-pass differential interferometry,respectively.The displacement on light of sight has been archived.Results from interferograms show that the displacement caused by the shock spans along the fault zone in a large area.The characteristics of this displacement provide helpful information for the earthquake inversion.The LOS displacement on the upper plate is similar to the inversed displacement from the finite fault model of USGS while the down plate has a large error.The comparison of the differential SAR interferograms indictes that the L band SAR interferometry is more useful than C band for monitoring the ground displacement around the Longmenshan fault zones.更多还原