Crustal deformation before the 2008 Wenchuan MS8.0 earthquake studied using GPS data

摘要: Abstract We used GPS velocities from approximately 700 stations in western China to study the crustal deformation before Wenchuan MS8.0 earthquake. The processing methods included analyses of strain rate field, inversion fault locking and velocity profiles. E-W direction Qinghai-Tibet block shows that extensional was dominant region (west 92.5° E), while compressive predominated eastern (from 92.5° E 100° E). On a regional scale, hypocentral earthquake located at edge an intense compression zone about 1.9 × 10−8/a east-west direction. characteristic seismogenic with dextral component. greater fault's than its region, accumulation very slow on scale. results show fraction slip deficit middle-northern section southern section. profile smaller deformation, which is asymmetrical respect distribution co-seismic displacement. These characteristics should provide some clues occurred later period cycle.