Abstract:By using the GPS horizontal velocity field of 2009-2015 and the negative dislocation model of DEFNODE, we invert for fault locking and fault slip deficit of the Red river fault zone, and analyze the potential seismic danger, combining with the results of precision positioning of small earthquakes. The results show that the fitting results of GPS horizontal observation value and the simulated value are good, and there is also a certain correlation between the distribution of minor earthquakes and the degree of fault locking. The inversion results show that the middle section of the Red river fault is different from the south to north, and that the northern part is basically completely locked. The fault slip deficit rate is relatively large, which has the potential danger of a larger earthquake, and the degree of locking of the southern fault is much weaker. The locking degree of other sections of the Red river fault are also much weaker, and there are no strong blocking states in these sections, especially in the southern section of the fault zone. The fracture is basically transformed from the locking state to the creep state at 2-5 km depth, the fault slip deficit rate is relatively small, and the possibility of larger earthquakes in this section is much smaller.
LI Ning,KANG Shuai,ZHU Liangyu. Study on Present-Day Locking and Seismic Hazard of the Red River Fault Zone Based on GPS Data[J]. jgg, 2019, 39(7): 700-705.