升降轨SAR数据融合的地震形变场观测

Inferring Deformation Field of Earthquake Based on Ascending and Descending SAR Data

鉴于D-InSAR方法在雷达视线方向上存在模糊现象而无法得到地表三维方向形变量的问题,利用升降轨雷达视线方向形变量和限定方程联合求解地震三维形变量的方法。该方法首先对干涉纹图特征进行分析,然后基于发震断层走滑分量较小的特点,将断层走向形变值假定为零作为限定方程,从而实现三维形变场的解算。以拉奎拉Mw6.3地震为例,实验结果与野外调查结果相一致,验证了该方法的有效性。

In order to overcome the fuzzy problem in the Line of Sight （LOS） direction during the D-InSAR method, the deformations of ascending and descending in the LOS direction are combined with the restricted equation to obtain the three-dimensional deformations. The proposed method firstly analyzes the characteristics of the interferogram. And then based on the characteristic of small strike-slip component of the causative fault, a restricted equation which assumes the deformation in the fault to be zero is introduced. By analyzing the L＇aquila Mw6. 3 earthquake, the experimental result is correspond to that from the field, which shows the effectiveness of the proposed method.