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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。
Using the ENVISAT / ASAR and ALOS / PALSAR data, combined with two-channel differential interferometry, the coseismic deformation information of the Wenchuan earthquake and the deformation characteristics of the ground in the LOS direction before and after the earthquake were obtained. The results show that the deformation caused by the Wenchuan earthquake has a wide range of deformation, and the deformation along the fault extends north-north-eastward. The formation of the differential interference fringes is obvious. The deformation characteristics of the ground have important reference value for inferring the nature of faults and studying the characteristics of earthquake deformation and earthquake development. In addition, the results of the differential interference measurement of co-seismic radar and the deformation of the LOS direction retrieved by the finite fault model of the Wenchuan Earthquake distributed by the USGS are compared and verified. Good consistency, but there is a big error in the next set. Comparisons of different sensor interference results show that the L-band radar interference results can better reflect the ground deformation information of the Wenchuan Earthquake near the Longmenshan fault zone.