The macroscopic epicenters distribute along Huangnitan, the meizoseismal area is small and the seismic wave attenuates fast, which reflects the sources are shallow.

• 震群的宏观震中位于郭家坝镇黄泥滩一带，极震区较小、地震波衰减较快，反映出该微震群的浅源特点。