Abstract Using the GPS velocity field of 2009-2015, the vertical velocity field of 1975-2011, and the negative dislocation model of TDEFNODE, we invert for fault locking and fault slip deficit of the north margin of west Qinling fault. Using the GPS velocity profiles and distribution characteristics of small earthquakes, this paper analyzes the fault activity and seismic risk along different segments of the north margin of west Qinling fault. The results show that the characteristic of the whole fault is left strike slip with compression, the slip rate of each segment is lower than that of the quaternary period, the slip rate of Tianshui-Baoji segment is low, the faults have the lowest activity, the earthquake distribution of the fault is few, the faults have high locking fraction and high slip deficit rate, and they have the background conditions for the occurrence of moderately strong earthquakes. Although the slip rate of the Guomatan segment is high, the fault has high locking fraction and high slip deficit rate, earthquakes are fewer, and the seismic risk is high. The slip rate of the Zhangxian and Yuanfeng segments are higher, the faults have the highest activity, the earthquake distribution of fault is greater, they have low locking fraction and low slip deficit rate, and the seismic risk is low.
LIU Lei,SANG Jizhen,ZHANG Xiping et al. Analysis of the North Margin of West Qinling Fault Locking Based on GPS and Leveling Data[J]. jgg, 2019, 39(6): 562-568.
LIU Lei,SANG Jizhen,ZHANG Xiping et al. Analysis of the North Margin of West Qinling Fault Locking Based on GPS and Leveling Data[J]. jgg, 2019, 39(6): 562-568.