Study on the Double-Difference Hypocenter Locations based on the envelope stations underground mines

At present, the micro-seismic monitoring system mostly adopts the mean velocity model and the absolute location method and the focal location error is large, which seriously affects the later processing interpretation, safety evaluation, and roadway support design. To tackle this problem, this paper adopts the absolute locating method based on the average velocity model under the envelope stations, the absolute positioning method is used to obtain the initial positioning result, and then we apply distance-weighting scheme for the monitoring station and the key monitoring area. Furthermore, the Double-Difference Hypocenter Locations is used for relocation. Finally, the mine site data is used to carry out the IMS micro-seismic monitoring system positioning results and the double-difference positioning results benchmarking, and the linkage analysis with the mine site mining process. The results show that the relocation results obtained by the Double-Difference Hypocenter Locations based on the envelope stations are more reliable and more accurately match the area where the hazard source is located during mining.