Abstract In order to study the evolution characteristics of geological activity of the Red river fault zone in recent years, and analyze the seismic risk in the region, we use the GNSS velocity field data of 1999-2007 and 1999-2017. The negative dislocation-block model is used to invert fault locking and slip deficit velocity of the Red river fault zone. The results show that the locking degree of the Red river fault zone is characterized by strong ends and weak middle. The locking depth of the southern and northern segments are 20 km and the locking degree is relatively high. The locking depth of the middle segments are 5 km and the locking degree is relatively low. In terms of slip deficit, the northern segment is 2.5-5 mm/a, with a faster rate of energy accumulation. The middle segment is 0.4-1.8 mm/a, and the southern segment is 1.5-2 mm/a. The middle and southern segments are relatively stable. After 2008, the locking degree of the Red river fault zone maintained the previous characteristic. The deep locking state of the northern and southern segments began to spread to the middle, and the overall locking degree of the Red river fault zone deepened. At the same time, the slip deficit rate increased. The seismic risk of the northern segment continued to increase, while the active state of the southern segment became unstable.
XUE Chen,XU Keke,LIU Xinqi et al. Time-Space Evolution of the Current Three-Dimensional Fault Locking of the Red River Fault Zone Constrained by GNSS[J]. jgg, 2024, 44(1): 63-68.
XUE Chen,XU Keke,LIU Xinqi et al. Time-Space Evolution of the Current Three-Dimensional Fault Locking of the Red River Fault Zone Constrained by GNSS[J]. jgg, 2024, 44(1): 63-68.