Three Dimensional Coseismic Deformation and Fault Slip of Maduo Mw 7.4 Earthquake from Joint Sentinel -1a and Gnss Observation

Abstract

On May 22, 2021, Mw 7.4 Maduo earthquake occurred in Qinhai province, China, which is located on Kunlunshankou-Jiangcuo fault China. In this paper, two type of the coseismic deformation of Maduo are reached using (interferometric synthetic aperture radar) InSAR and GNSS (the global navigation satellite system) data. Three dimensional surface deformation is derived from InSAR and GNSS data. At the same time, based on half infinite space elastic medium and multi-layer earth medium, the distribution of strike slip and dip slip is inverted from GNSS only, InSAR only and joint GNSS and InSAR, respectively. Three dimensional coseismic deformation has similar spatial characteristics in East-West(E-W), North-South(N-S) and Up-Down(U-D) direction. While the deformation in N-S is much smaller than that in E-W and U-D direction. The inverted dip slip has the same magnitude with strike slip and the magnitude in multi-layer earth medium is larger than that in half infinite space elastic medium. By comparing of fault slip inverted from three kinds of data, we find that the value of strike slip is 5-6 m. The result of strike slip shows negative-positive characteristics from left to right along strike direction and negative-positive characteristics from top to bottom along dip direction.

Keywords: GNSS, InSAR, Joint inversion, three dimensional deformation, coseismic slip inversion