Torsional shear wave generator

Details Torsional shear wave generator Torsional shear wave generator

1980-02-22

1982-01-12

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181401, G01V 1053

Patent

active

043100660

ABSTRACT:
The present invention relates to a torsional shear wave generator for producing clean horizontally polarized seismic shear waves that can be utilized in investigating the earth's subsurface. Basically the torsional shear wave generator of the present invention comprises a hollow elongated shaft having a plurality of circumferentially spaced vanes radially projecting therefrom. Secured to a top portion of the shaft, as normally positioned in the ground, is a loading arm that extends generally perpendicular to the longitudinal axis of said shaft. In some cases, the central shaft is not necessary if the vanes can be joined by other means such as welding.

REFERENCES:
patent: 2740489 (1956-04-01), White et al.
patent: 2760591 (1956-08-01), White et al.
patent: 3552195 (1968-12-01), Koprowski
patent: 3716111 (1973-02-01), Laverene
patent: 4103756 (1978-08-01), Trulio et al.
Richards, "Marine Geotechnology," 1979, pp. 1-22, vol. 3, Crane, Russak & Co., Inc.; 536M338v.3.
Poplin et al. "Evaluation of the Vane Shear Test in Louisiana," 12/78, pp. 1-219, Report FHWA-LA-78-207L.

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