Removal of airblast from a 3-D engineering seismic survey with a wavelet packet filter

Summary We carried out a 3-D seismic reflection survey at a construction site in urban Glasgow to map the bedrock surface and to try to detect abandoned coalmine works. After 2-D trials we selected a minivibrator source over impulsive sources because the former was less sensitive to the urban and construction noise. The shotpoint-receiver array led to a mean 93 fold of coverage. The data processing included the filtering of the airblast from raw shot records employing a 1-D wavelet packet transform. This processing step extended the useful data window and led to an improvement of the stacked section. We successfully imaged the contact between the boulder clay and the bedrock. Several reflectors are present in the bedrock. Discontinuities may possibly represent mine works.