JiShiShan Mw 6.2 Earthquake Monitoring by Means of Lutan-1 SAR Data and Optical Data

On December 18, 2023, a 6.2-magnitude earthquake hit Jishishan County, Linxia Prefecture, Gansu Province, followed by several aftershocks. The earthquake caused a large number of house collapses and casualties. Interferometric Synthetic Aperture Radar technique can obtain multiple dimensional information for geo-hazard management. Lutan-1 SAR satellites with accurate orbit control ability are the first group L-band SAR constellation in China, which provide the potential for deformation monitoring with centimeter even millimeter accuracy. Based on the pre-earthquake and post-earthquake Lutan-1 SAR data and Gaofen-7 optical data, the information of coseismic deformation, debris flow and slope collapse were extracted and analyzed. It provides important data support for post-earthquake rescue and post-disaster reconstruction. The coceismic deformation field characterized the typical deformation induced by the earthquake, and the maximum deformation can reach to 8 cm. The debris flow area showed obvious change on the SAR data and optical data, including spectral information and backscattering information. In combination with the application of Lutan-1 and Gaofen-7 data, the earthquake and secondary disaster can be effectively monitored.