A040 SEISMIC RECONNAISSANCE BEYOND THE FACES OF AN ADVANCING COAL MINE ROADWAY K. ESSEN 1 R. MISIEK 1 AND W. FRIEDERICH 2 Summary 1 Within the scope of the current project the aim is to develop a non-destructive investigation technique using seismic waves to obtain information on the state of the rock ahead of the faces of a coal mine roadway. First test measurements were carried out in a mine of the Deutsche Steinkohle AG (DSK) in the northern Ruhr area. A series of disturbances are expected beyond the faces of this roadway from geologic investigations. Synthetic seismograms were calculated


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