Large Off-Fault Deformation of 2021 Mw 7.4 Maduo Earthquake along an Immature Strike-Slip Fault, Tibetan Plateau

The characteristics and factors that control the Off-Fault Deformation（OFD）remain poorly understood. The existing studies shows the 2021 Mw 7.4 Maduo earthquake produce the largest OFD than other earthquake cases. We try to use the China Gaofen-serie-satellite images to re-constrain the OFD deformation. By correlating pairs of images before and after this earthquake, we obtain the coseismic deformation parttern of  the 2021 Mw 7.4 Maduo earthquake. By measuring the coseismic deformation, we constrain the near-field and far-field surface displacement distribution. The result shows that this earthquake accommodated 69% of total surface deformation as OFD deformation over a mean deformation-zone width of 237 m.  Our result show the OFD proportation of the Maduo earthquake is large, but our result is lower than the result by using the SPOT and Sentienl-2 images. By analying the fault geometry  and geological deposit, we think the magnitude and width of off-fault deformation along the rupture is primarily controlled by the fault maturity and structural complexity of the fault.