The Xianshui river fault sliding inverted by Okada model and InSAR data
In response to the complexity of calculating the Green's function for the Okada elastic dislocation model,this article takes the northwest section of the Xianshuihe Fault as an example.Taking advantage of the fine-grained inversion of InSAR deformation data with high spatial resolution,and combining with the open-source Green's function calculation program,a numerical relationship between InSAR deformation data and fault slip is established.Laplace smoothing constraints are applied to the sliding of adjacent sub fault layers to develop a fault slip distribution inversion program.The data processing is optimized to eliminate the influence of vegetation changes and atmospheric errors in InSAR deformation data.GNSS stations are used to correct the errors in InSAR deformation data and reverse the sliding distribution of the northwest section of the Xianshuihe Fault.The experimental results show that the program can fully utilize the advantages of high-precision and high spatial resolution of InSAR deformation data,achieve effective constraints on fault sliding,and high-precision inversion of deep sliding and shallow creep distribution.In addition,three obvious locking zones were found in the northwest section of the Xianshuihe Fault,which poses a cascading rupture hazard and may lead to the occurrence of large earthquakes above Mw 7.0.
Okada dislocation modelInSARnorthwest segment of the Xianshuihe faultshallow creeplocked area
NETL
NSTL
万方数据
