Seismic study of the dynamic response of rock to cylindrical charges fired in a half and a quarter space geometry

A series of controlled seismic experiments was performed a limestone quarry in southem Germany to study seismic effects of cylindrical charges fired in both a half space (HS) (burden 63 m) and quarter space (QS) (burdens of 3 and 3.5 m) geometry. Charge columns contained from 20--32 kg of explosives and initiated frorn the bottom. The explosives formed a cylinder 4 rn (20 kg) and 5 rn (32 kg) high and 90 rnrn in diameter at depths from 3-8 rn below ground level. Prior to each of the larger explosions, srnall charges of 0.12 kg seisrnogelit were fired at 4 m and 8 m depths in the same boreholes.