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The velocity of an over-burst coal seam is about 1/3 compared to a normal coalseam based on laboratory test results.This can be considered as a basis to confirm thearea of coal and gas burst by seismic exploration technique.Similarly,the simulation resultof the theoretical seismic model shows that there is obvious distinction between over-burstcoal and normal coal based on the coal reflection’s travel-time,energy and frequency.Theresults from the actual seismic data acquired in the coal and gas over-burst cases is consistentwith that of the laboratory and seismic modeling;that is,in the coal and gas burstregion,seismic reflection travel time is delayed,seismic amplitude is weakened and seismicfrequency is reduced.Therefore,it can be concluded that seismic exploration techniqueis promising for use in distinguishing coal and gas over-burst regions based on thevariation of seismic reflection travel time,amplitude and frequency.
The velocity of an over-burst coal seam is about 1/3 compared to a normal coalseam based on laboratory test results. This can be considered as a basis to confirm the area of coal and gas bursts by seismic exploration technique. Similarly, the simulation result of the theoretical seismic model shows that there is a significant distinction between over-burst coal and normal coal based on the coal reflection’s travel-time, energy and frequency. the results from the actual seismic data acquired in the coal and gas over-burst cases are consistent with that of the laboratory and seismic modeling; that is, in the coal and gas burstregion, seismic reflection travel time is delayed, seismic amplitude is weakened and seismicfrequency is reduced.Therefore, it can be concluded that seismic exploration techniqueis promising for use in distinguishing coal and gas over-burst regions based on thevariation of seismic reflection travel time, amplitude and frequency.