Abstract Based on four phases of GNSS crustal movement velocity fields from 1999 to 2007, 2009 to 2013, 2013 to 2017 and 2017 to 2021, we analyze the current differential movement characteristics of each secondary fault by constructing GNSS velocity profiles. Furthermore, we establish a negative dislocation model to invert the current locking degree and slip deficit rate of each secondary fault. The results show that: 1) The northern margin fault of west Qinling mountains currently presents the activity characteristics of sinistral strike-slip and thrust extrusion. 2) From 1999 to 2007, the Guomatan section and Tianshui-Baoji section were all in a strong locking state, while the Zhangxian section and Yuanfeng section were only partially locked with low degree and shallow depth. From 2009 to 2013, the locking degree of middle section of northern margin fault of west Qinling mountains was weakened. The eastern Yuanfeng section and eastern Tianshui-Baoji section changed from strong locking to creep state, while the Guomatan section and central and western Tianshui-Baoji section still showed strong locking state. From 2013 to 2017, the northern margin fault of west Qinling mountains was in a strong locking state, and only the eastern Tianshui-Baoji section was in a creep state. From 2017 to 2021, the central and western Guomatan section, Zhangxian section, eastern Yuanfeng section, and central Tianshui-Baoji section were in a strong locking state, while the central Yuanfeng section and western Tianshui-Baoji section were in a creep state. 3) The overall distribution characteristics of slip deficit rate of each secondary fault are basically consistent with the locking degree. The Guomatan section and central Tianshui-Baoji section of northern margin of west Qinling mountains are in a strong locking state and have a strong background of strain energy accumulation.
QU Wei,CUI Yao,HAO Ming et al. The Current Activity Characteristics of Northern Margin Fault of West Qinling Mountains Based on GNSS[J]. jgg, 2024, 44(3): 221-227.
QU Wei,CUI Yao,HAO Ming et al. The Current Activity Characteristics of Northern Margin Fault of West Qinling Mountains Based on GNSS[J]. jgg, 2024, 44(3): 221-227.