Application of Lutan-1 SAR Satellite Constellation to Earthquake Industry and Its Prospect
Objectives:Lutan-1(LT-1),as the first constellation of civil L-band interferometric synthetic aperture radar(InSAR)satellites in China,primarily focuses on surface deformation measurement by leveraging the differential interferometric,while also possessing height measurement and fully polarimetric imaging ca-pabilities.With its dual-satellite formation imaging mode,it can achieve a strict revisit period of four days,which is highly beneficial for surface deformation monitoring and emergency response to natural disasters such as earthquakes.From the perspective of the LT-1 SAR satellite's imaging capabilities and the de-mands of the seismic industry,we primarily highlight the preliminary applications of the satellite system during the testing phase.The main objective is to evaluate the satellite data's capabilities in co-seismic de-formation monitoring,emergency observations,and remote sensing interpretation of active fault zones.The ultimate purpose is to provide a reference for the future commercialization of seismic applications,based on the potential applications of the satellite data in these fields.Methods:Taking the examples of the 2022 Luding earthquake in Sichuan Province,China,the 2023 Turkey earthquake,and the Jishishan earth-quake in Gansu Province,China,coseismic deformation monitoring will be conducted.The deformation maps will be assessed in terms of accuracy and monitoring capabilities.Additionally,emergency assess-ments of secondary earthquake hazards and remote sensing investigations of active fault zones will be car-ried out based on the high-resolution SAR data from the LT-1 satellite.Results:By comparing the co-seis-mic deformation results derived from LT-1 satellites with the results from concurrent other SAR satellites and global navigation satellite system(GNSS)measurements,it has been verified that the LT-1 satellite has significant advantages in terms of monitoring accuracy and spatiotemporal resolution.In addition,le-veraging the high-resolution advantage of LT-1 SAR satellite imagery,it is possible to quickly obtain in-formation on the distribution of earthquake-induced landslides and accurately delineate the accessibility of roads in the affected area.This capability effectively supports earthquake emergency response and disaster assessment efforts.Furthermore,thanks to the L-band sensor,the LT-1 satellite exhibits strong penetra-tion capabilities,thus enabling the detection of hidden faults.Conclusions:Through multiple case studies in the seismic industry,encompassing various areas such as coseismic deformation monitoring,emergency response,and hidden fault detection,the results have demonstrated that the LT-1 satellite constellation has a significant breadth and depth of applications in the seismic industry.In the future,it will effectively support scientific research on seismic cycles and earthquake emergency operations.
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