Research on Faults Slip Rate in Weihe Basin based on GPS Data

Abstract

Based on the GPS data from 2001 to 2011 in Shaanxi Province, a three-dimensional geometric model of faults in Weihe Basin is constructed. Based on the deep fault dislocation model, the present slip rate of main faults in Weihe basin is studied. The results show that: (1) The place with large GPS fitting residual is located at the junction of two faults. (2) The slip rate inversion of most faults is consistent with the geological results, but the slip rate of some faults is quite different from the geological results, and even the movement mode changes. (3) In general, the activity of faults in Weihe Basin is relatively weak. Relatively speaking, the current tensile slip rates of Weihe fault, Chang’an-Lintong fault and eastern segment of northern Qinling fault are relatively high, which are (1.20 ± 0.87∼1.69 ± 1.24) mm/a, 2.54 ± 0.94 mm/a, 0.63 ± 1.00 mm/a, respectively.