|
In comparison to technologies like photogrammetry and LIDAR, InSAR systems can image ground targets regardless of day or night, weather, or other factors. InSAR technique with phase measurement provides a higher measurement accuracy than SAR stereo mapping technology. As a result, D-InSAR technology can supply both highly precise and real-time topographic data and data sources for research such as seismic monitoring. In this paper, taking the Gashi earthquake with a magnitude of 6.4 that occurred in Xinjiang, China, on January 19, 2020 as an example, the digital elevation model (DEM) within the earthquake zone was updated and the surface deformation dynamics before and after the earthquake were obtained using the three-track method in D-InSAR for the 3-view open-access Sentinel-1Asatelliteimages. The obtained DEM results are randomly selected at sampling points in areas far from the earthquake-prone areas in this work, and the SRTM3 DEM data transformed to the same elevation reference are utilized as the presumed true values for future analysis and comparison. The DEM extracted using the D-InSAR technique from two pre-earthquake images was used for topographic phase simulation, then differential interference with the post-earthquake images, and finally surface displacements in vertical directions were extracted to verify the effectiveness and potential of D-InSAR in measuring the size of the Coseismic deformation field of earthquake and its spatial distribution.
|
