Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1989-08-04
1990-06-19
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 38, G01V 136
Patent
active
049359053
ABSTRACT:
A geophone is disclosed which includes at least two transducers having axes which are perpendicular to each other for generating Cartesian coordinate signal components in response to at least vertical and horizontal in-line seismic wave motion of the geophone. The Cartesian coordinate signal components are converted to polar coordinate signal form including vector length, L, and angle, .theta., signal values. Surface wave noise signal components, such as ground roll wave signals, included in the L and .theta. signals are attenuated, or suppressed, to obtain signals L.sub.B and .theta..sub.B proportional to body waves. The L.sub.B and .theta..sub.B signals are converted to Cartesian coordinate signal form for subsequent processing along with outputs from other geophones in a geophone array for locating underground formations, deposits, or the like. A third transducer may be included in the geophone for generating a third orthogonal signal component, and the three orthogonal signal components are converted to spherical polar coordinate signal form L, .theta. and .delta., which signals then are processed for suppression of ground roll wave signal components therefrom. Ground roll suppression includes averaging the polar coordinate signal components L, .theta. and .delta. to obtain L.sub.GR, .theta..sub.GR and .delta..sub.GR signals proportional to the ground roll wave components. The ground roll wave components are subtracted from the respective L, .theta., and .delta. signal components to obtain ground roll wave suppressed signal components L.sub.B, .theta..sub.B and .delta..sub.B.
REFERENCES:
patent: 3344881 (1967-10-01), White
patent: 3719924 (1973-03-01), Muir et al.
patent: 3872478 (1975-03-01), Lucole
patent: 4397005 (1983-08-01), Gassaway et al.
patent: 4458341 (1984-07-01), Goebel
patent: 4783770 (1988-11-01), Dambom
Beckman Victor R.
Lobo Ian J.
Terra Linda Canada, Inc.
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