Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
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
Cholet Jacques
Layotte Pierre-Claude
Birmiel Howard A.
Institut Francais du Pe'trole
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