利用InSAR和GPS形变数据反演断层深部滑动的敏感性分析

Research on the Sensitivity of Deep Slip Inversion for Earthquake Fault Slip Constrained by InSAR and GPS Geodetic Deformation Data

为探究InSAR和GPS形变数据对断层深部滑动的敏感性,分别模拟走滑断层、正断层和逆冲断层在不同深度的滑动分布模型,并基于不同精度的InSAR和GPS形变数据反演了3类断层在不同深度位置的滑移分布。对3类断层的结果进行对比分析发现,实验得到的结论具有较好的一致性。结果表明,在相同深度时,基于高精度InSAR和GPS形变数据反演的深部滑动残差较小,而基于常规精度InSAR数据反演结果的残差较大;随着深度的增加,反演深部滑动的探测性呈逐步下降的趋势,其中基于高精度InSAR和GPS数据的滑动探测性高于基于常规精度InSAR的滑动探测性。当InSAR和GPS数据精度相同时,维度对断层深部滑动的探测性有一定影响。

To explore the influence of geodetic data with different dimensions and precisions on the inversion of fault slip distribution, we take three typical faults as subjects to discuss and analyze. We also experiment with slip distribution inversion where the deep slip varies along depth direction of the three categories faults from the different accuracy InSAR and GPS geodetic deformation. Comparing the results of three categories of faults, we find that the conclusions are highly consistent. The results show that at the same depth, the residual error by InSAR and GPS geodetic deformation with high accuracy is small, and the residual error of InSAR geodetic deformation with normal accuracy is larger. As center depth increases, the detection capability of deep slip inversion decreases gradually. The detection capability of deep slip inversion based on deformation(InSAR or GPS) with high accuracy is higher than that based on InSAR deformation with normal accuracy. When the accuracy of InSAR and GPS deformation is the same, the dimensionality has a certain influence on the detectability of the deep slip of the fault.