Characteristics of the M_L3.9 Jinzhai, Anhui, earthquake swarm sequence in 2014

This paper relocated the M_L3.9 Jinzhai, Anhui, earthquake sequence in 2014 with double-difference earthquake location algorithm firstly, and then calculated the focal mechanisms of stronger earthquakes of the swarm by using Snoke and CAP methods, respectively. Finally, the spatio-temporal evolutionary characteristics of source parameters were analyzed. The results show that the Jinzhai earthquake swarm sequence was distributed in the dense scope of 2 km×2 km without predominant direction. The focal depth is very shallow, being 3-7 km. In addition, the focal mechanisms of larger earthquakes are basically consistent with each other. The strikes of two nodal planes are separately along the direction of NW and NNE, and the dips of two nodal planes are very high, suggesting the Jinzhai earthquake swarm sequence was caused by strike-slip faulting under the action of horizontally compressed nearly in E-W direction and horizontally extended nearly in N-S direction.