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Master event location method was described in detail in this paper Some problems in the application of masterevent method have been analyzed and some improvements of the method have been made. As compared the location results of Ms≥23.0 earthquakes of Jiashi swarm obtained by using this method with that by the traditional absolute method, the result obtained by using the master event method shows more reasonable and more consistentwith that from the focal mechanism solutions. After relocation, we can see, the epiceniers of M≥5.0 eearthquakesshow an echelon-type alignment along NNW-SSE direction, and all earthquakes concentrate nearly in a volumeregion about 30 km (N-S)× 15 km (E-W)× 15 km (U-D). Earthquake focal depths are mainly in the range of 15~28km.
Master event location method was described in detail in this paper Some problems in the application of masterevent method have been analyzed and some improvements of the method have been made. As compared the location results of Ms ≥ 23.0 earthquakes of Jiashi swarm obtained by using this method with that by the traditional absolute method, the result obtained by using the master event method shows more reasonable and more consistent with that from the focal mechanism solutions. NNW-SSE direction, and all earthquakes concentrate nearly in a volume region about 30 km (NS) × 15 km (EW) × 15 km (UD). Earthquake focal depths are mainly in the range of 15 ~ 28km.