Abstract
This paper describes the influence of mining parameters and geological conditions on seismicities associated with longwall coal mining. Microseismic activities were observed by using a mine-wide seismic array at 13 mining panels in the deepest coal mine in Japan. Most microseismic events were located in the vicinity of coal faces. In this case where a coal face was advanced along the rib-side of an old working, the tail entry T-junction suffered the most severe seismicity in the panel. The seismicity also intensified during the widening of a coal face. The seismicity at a panel was significantly alleviated by the presence of old workings above the panel, but intensified by a coal pillar left in an old working above the panel. The seismicity was also controlled by a fault. Stress analysis using a numerical model was attempted and the results offered good interpretation of the distribution of seismic energy density.
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