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Title:	Military hydrology : Report 15, The seismic refraction compression-shear wave velocity ratio as an indicator of shallow water tables : a field test
Authors:	Schuyler-Rossie, Christine.
Keywords:	Water table Military hydrology Groundwater
Publisher:	Environmental Laboratory (U.S.)
Series/Report no.:	Miscellaneous Paper;EL-79-6 Report 15
Abstract:	Abstract: To test the assumption that the velocity of shear waves increases much less than the velocity of compressional waves at a water table, a seismic refraction survey was performed over a shallow water table in alluvial sediment. Using a sledge hammer and a partially buried steel cylinder as a source, a maximum shot-to-receiver distance of 330 ft and depth of investigation of 60 ft were achieved. As predicted by the theoretical models considered, shear wave velocity did not increase measurably at the water table. In an area in which a shallow water table was not likely to exist, shear wave velocity increased by at least as much as the increase in compressional velocity at each refractor. Results indicate that the comparison of S- and P-wave velocity profiles is a promising technique for water table detection. However, more research is necessary to define the reliability and limits of the method.
URI:	http://hdl.handle.net/11681/22741
Appears in Collections:	Miscellaneous Paper