SH-WAVE SEISMIC REFLECTION TO MAP SHALLOW AQUIFERS, A GEORADAR-LIKE ACOUSTIC METHOD?
Since 2001 we have been developing acquisition and processing techniques for shear-wave seismic data acquisition that give outstanding results in most of the surface conditions in Illinois, including in the places where the P-wave reflection technique does not produce good results e.g. river flood plains and thick loess deposits. With geophone arrays mounted on sleds pulled along roads, we have achieved a data acquisition rate of up to 2 km/day.
Through several examples we demonstrate that SH-wave seismic reflection has the potential to provide crucial structural modeling information for hydrogeology in places where neither the P-wave seismic reflection nor the Georadar could give good results. This technique has given information from the surface down to 100 meters in various terrains such as glacial terrains including subglacial tunnel-channels, coarse fluvial sediment with a deep water table, near-surface faulting and cave collapses buried under loess.