Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1979-12-28
1981-08-18
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181401, 248678, G01V 1053
Patent
active
042841631
ABSTRACT:
The present invention relates to means for coupling the horizontally directed force of a seismic transducer into the earth with a downward-going shear wave. The coupling means consists of a plurality of downwardly-convergent, wedge-shaped, earth-engaging cleats dependently attached to the transducer support means, at least some of the cleats being provided with a plurality of downwardly projecting teeth, which may be mounted on or form a part of field replaceable cleat inserts. Extremely high unit pressures are developed on these teeth due to the hold down weight of the transducer. As a result, good earth penetration is achieved immediately on even very hard rock surfaces. The alignment of the teeth is such as to encourage the development of rock flaws or cracks oriented to accommodate the entry of the supporting cleats.
REFERENCES:
patent: 2557960 (1951-06-01), Gerhardt
patent: 3046843 (1962-07-01), Rowe
patent: 3159233 (1964-12-01), Clynch et al.
patent: 3716111 (1973-02-01), Lavergne
patent: 4050540 (1977-09-01), Cholet et al.
patent: 4135598 (1979-01-01), Stafford
patent: 4143736 (1979-03-01), Fair
Atlantic Richfield Company
Betz Robert M.
Moskowitz Nelson
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