Abstract:We collect, sort, process and analyze velocity field data, obtained before and after April 25, 2015 MS8.1 Nepal earthquake, from the earthquake zone and the Qinghai-Tibet plateau areas of China. According to the pre-seismic velocity field, the Himalayan tectonic belt presents compression characteristics of about 16 mm/a. Furthermore, according to the deformation characteristics, the pre-seismic Himalayan tectonic belt can be divided into eastern, central and western sections. The earthquake occurred in the middle and the main squeeze is northerly. The eastern and western sections have clockwise and counterclockwise characteristics, respectively. After the earthquake, the velocity field shows that the tectonic deformation of the impact is greater in Nepal and Southern Tibet, mainly because the pushing speed of the Himalayan tectonic belt decreases, the Southern Tibet north-south movement decreases, and the east-west speed increases. This phenomenon may have great impact on strike-slip faults in the Southern Tibet area.
WANG Dongzhen,ZHAO Bin,YU Jiansheng et al. Pre- and Post-Seismic Deformation of Nepal MS 8.1 Earthquake Derived from GPS Data[J]. jgg, 2017, 37(6): 579-584.