Slip Distribution Inversion Of 2020 Jiashi,xinjiang Ms6.5 Earthquake Based On Sentinel-1A Satellite Data

Earthquake is the earth shaking caused by the rapid release of crustal energy,which may also cause harm to human beings with the occurrence of some other natural disasters.Therefore,more and more scholars put into the research of earthquake monitoring.With the development of various geodetic observation techniques,it is used to interpret earthquakes through the analysis of deformation.InSAR technology can be used for large-scale monitoring in the form of radar,with high monitoring accuracy and long-term observation,so it has developed very rapidly and gradually become one of the most effective methods in the field of seismic monitoring.On January 19,2020,the Ms6.5 earthquake occurred in Jiashi County,Xinjiang Autonomous Region,China.This paper takes this Jiashi Earthquake Area as the research area.By collecting the orbit data of Sentinel-1A satellite and processing it with synthetic aperture radar interferometry,the co-seismic deformation results of the Jiashi Earthquake are obtained and analyzed.After the co-seismic deformation is obtained,the constrained inversion is carried out by using the rectangular dislocation theory model in elastic half-space dislocation,and the slip distribution of seismogenic faults and source mechanism parameters are obtained,so as to explore the seismogenic mechanism of the Jiashi Earthquake and its relationship with the regional geological tectonic activity.The main research work and achievements of this paper are as follows:1.D-InSAR technology is used to process the image data of Sentinel-1A satellite in ascending and descending orbit modes to obtain the line-of-sight co-seismic deformation field.The range of the deformation field is about 60 km × 30 km.The long axis direction of rising and falling deformation fields is nearly east-west.The co-seismic deformation field is divided into two deformation areas: South and North.The South deformation area is mainly characterized by LOS uplift,while the North deformation area is mainly characterized by LOS subsidence.The maximum line-of-sight uplift is 7.4cm,and the maximum settlement is3.6cm.In the same region,the deformation direction and shape of ascending and descending orbits are roughly the same,but the distribution of deformation in the South and North regions is asymmetric.Combining with the characteristics of the Kepintage thrust nappe structure,it can be inferred that the seismogenic fault movement of the Jiashi earthquake is dominated by thrust.2.Inversion of co-seismic slip distribution of Jiashi Earthquake by using SDM program based on rectangular dislocation theory model in elastic half-space dislocation.The inversion result shows that the epicenter of the earthquake is located at(39.89° N,77.26 ° E);The fault slip concentration area is located at the position of 10-20 km along the fault dip direction and25-50 km along the strike direction.The maximum slip amount of the fault is 0.33 m,and the average slip angle is 91.20 °?The author calculated seismic moment is 1.5831018 N·m,and the converted moment magnitude is Mw6.1.The global matrix moment tensor Center(GCMT)issued the magnitude of Mw6.0,and the U.S.Geological Survey(USGS)issued the magnitude of Mw6.05.Compared with the research results in this paper,the D-InSAR data processing and fault inversion results of the Jiashi Earthquake are more reliable.