The Calculation and Analysis of the Co-seismic Deformation Field of Yutian Ms 7.3 Earthquake Basing on the Ascending and Descending Orbit ASAR Data

Abstract

The Differential Interferometric Synthetic Aperture Radar(D-InSAR) based on the ascending and descending orbit data can better reveal the feature of coseismic deformation fields.With the ASAR data from European Space Agency(ESA) and two-pass D-InSAR measurement,this paper obtained both ascending orbit and descending orbit coseismic deformation fields of Yutian Ms7.3 Earthquake.The results show that the max LOS uplifting value is about +13.3 cm and the subsiding value is about-82.0 cm in the ascending-orbit coseismic deformation field,and the max LOS uplifting value is about +36.5 cm and the subsiding value is about-66.5 cm in the descending-orbit coseismic deformation field.The Yutian Earthquake is mainly rupturing along the NNE-trending normal fault with a little left-striking,the northwest plate is the hanging-wall(subsiding) of the normal fault,and the southeast plate is the footwall(uplifting) of the normal fault.The coseismic deformation fields of ascending and descending orbits are different from each other in some aspects,but their variable tendencies and characteristics are similar,and the difference is mainly due to the two different observation modes.