Abstract: On January 21^st, 2016, an M_W5.9 earthquake occurred nearby the fault zone of Lenglong ridge in Menyuan of Qinghai. In the paper, based on Sentinel-1A satellite image, we use differential interference radar measurement technology to study the seismic deformation. The results show that the Menyuan earthquake deformation influences scope of about 20~30 km, the deformation are displayed as uplift, the influenced area is concentric distribution along the Lenglong ridge fault zone,the causative fault is likely to be a reverse fault between Lenglong ridge fault and Minle-Damaying fault, and the maximum deformation magnitude along the radar line of sight direction is about 6.5 cm. Uniform slip inversion shows that the causative fault 7.3 km long, 6.2 km wide, 9.5 km depth, strike 298.6°, dip 34.5°, along the strike slip momentum is 170 mm, along the dip slip momentum is 460 mm,and the moment magnitude is M_W5.97. Distributed slip inversion shows that the earthquake is thrust tectonic quake with right-lateral strike-slip. Slide mainly is concentrated in the direction along the fault dip, where distance from the surface of the 5 km to 15 km, the biggest slide momentum is 0.3 m, in the fault depth of 10 km with moment magnitude of M_W5.93.

Key words: Coseismic deformation field, Slip distribution inversion, InSAR, Sentinel-1A, The 2016 Menyuan M_W5.9 earthquake