Abstract:
In this paper, the focal depths of 40
ML≥1.8 earthquakes in 2014 Jinzhai
ML3.9 earthquake swarm were determined using PTD earthquake location algorithm, which was confirmed by sPL depth phase method, then the statistical characteristics and varied characteristics over timeare analyzed. The result shows that the focal depths of Jinzhai earthquake swarm were very shallow, concentrated in the 4~6 km range, which indicates that Jinzhai earthquake swarm were the shallow tectonic earthquakes occurred in the upper crust, and the focal depths were stable over time with no tendency to become deeper over time.