Joint inversion of minimum one-dimensional velocity model of Keping block
Using 8858 P-wave arrival data of 1002 natural earthquakes with ML ≥ 2.0 recorded by digital seismic stations (38.0°—42.5°N,75.0°—80.5°E) in the Keping block and its surrounding areas from June 2018 to May 2020,the minimum one-dimensional P-wave velocity model of the Keping block was inverted based on the Velest algorithm,and the positioning results and station travel time correction were obtained simultaneously.The results showed that after relocation,the root mean square residuals of the travel time of the three initial models were significantly reduced,and the station calibration basically showed positive calibration.Moreover,with the Puchang Fault as the boundary,the calibration degree of the stations on the west side of the Puchang Fault was greater than that on the east side of the Puchang Fault;After relocation,the epicenter location became more convergent in space,and the depth of the epicenter tended to follow a normal distribution,resulting in significant improvement in the locationresults.
万方数据
维普
