Joint Inversion for Relocation and Velocity Structure of Small Earthquakes in Changde and Its Adjacent Region
JING Shaoqun
WANG Jiawei
Abstract：In order to understand the deep tectonic environment and the seismic activity in Changde and its adjacent areas, the paper relocates the earthquakes by using seismic observations of Changde and its adjacent areas during 1987 and 2013, a joint inversion method of earthquake location and velocity structure. The results show that about 90% earthquakes occurred within 10 km underground, and belonged to shallow focus earthquakes occurring in the upper and middle crust; although earthquakes in Shimen occurred in the mining area, deep seismic activity occurred in the junction of high velocity body and low velocity body speed, and close to the side of the high velocity body, which seems to related to the deep structure and the fault activity; in the range of Dongting Lake with the depth of 10-15 km, there is a low velocity and high conduction layer.
Keywords：Earthquake locationChangde and its adjacent regionVelocity structureJoint inversionDeep tectonic environment
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 13-19 )