Inversion of fault dip-slip rate and locking depth in Central-Southern Shaanxi of China

Neotectonic movement of central and southern Shaanxi which is located between North China and Yangtze craton is represented by uplift of the Qinling Mountains and subsidence of the Weihe and Hanzhong basins. So the study of vertical crustal movement based on repeated leveling in this area is particularly important. We collected multi-period precise leveling data since 1970 s in the study area and obtained the vertical velocity field using the dynamic adjustment method with GPS vertical velocity constraints. Base on the velocity field we use grid search to inverse the fault dip-slip rates and locking depths. The result shows that the dip-slip rates of the northern margin of the Qinling fault are 2. 25 similar to 4. 35 mm . a(-1) with the locking depths of 7. 7 similar to 10. 0 km. The dip-slip rates of the frontal fault of Huashan are 2. 35 similar to 2. 71 mm . a(-1) with the locking depths of 2. 8 similar to 5. 0 km, which probably reveal that this fault is not locking completely. The dip slip rates of the northern margin fault of the Weihe Basin are about 2. 0 similar to 2. 5 mm . a(-1) with the locking depth of near 3. 0 km, which means the fault is mainly creeping. The dip-slip rate for the east section of the Lueyang fault is 3. 02 mm " a 1 with the locking depth of 6. 7 km. This fault is a more active one in southern Shaanxi area.