Study of microseismic activity associated with a longwall coal mining operation using a near-surface array

Abstract Microseismic studies associated with a longwall coal mining operation are described. The mine under study was located some 600 ft. below surface. Seismic events associated with controlled roof failure, and with stress development in both the roof and adjacent pillars were monitored by a seven-station near-surface array. The studies were carried out over a 6-month period during which the longwall face moved horizontally some 800 ft. below the area defined by the seismic array. Brief details are presented of the mobile monitoring system and the analysis techniques employed. Typical results obtained during the study are discussed along with suggestions for improving future studies of this type.