Movable device for generating acoustic shear waves in the earth

Details Movable device for generating acoustic shear waves in the earth Movable device for generating acoustic shear waves in the earth

1975-06-24

1977-09-27

Birmiel, Howard A.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181121, 340 155SW, 181401, G01V 114

Patent

active

040505405

ABSTRACT:
Device for generating shear waves in the earth for seismic prospecting, comprising means for striking with a mass a target-member coupled to the earth, said means including means for lifting and shifting said mass with respect to the target member, an electromagnet for intermittently locking it in an upper position and releasing it abruptly and means for adjusting the stroke of the mass from its upper position to its lower position where it impinges the target member.

REFERENCES:
patent: 2740488 (1956-04-01), Heaps
patent: 3205971 (1965-04-01), Clynch
patent: 3372770 (1968-03-01), Clynch
patent: 3587774 (1971-06-01), Bemrose et al.
patent: 3716111 (1973-02-01), Lavergne
patent: 3835954 (1974-09-01), Layotte

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