Method of measuring the anisotropy of propagation or reflection of a transverse wave, particularly a method of geophysical prospecting by measurement of the anisotropy of propagation or of reflection of shear waves in rocks
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United States of America Patent
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Dec 6, 1988
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N/A
app pub date -
Jun 2, 1987
filing date -
Jun 3, 1986
priority date (Note) -
Expired
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Abstract
The invention permits the measurement of the propagation anisotropy of a transverse wave between two given reference points of a non-isotropic medium (M), particularly a shear wave in a stratified or fissured rock. According to the invention: a source (S) and two detectors (G.sub.1, G.sub.2) are arranged along a single ray vector, the detectors being positioned at the location of respective reference points; the source is excited by an excitation signal producing a transverse wave in the medium; the respective resultant measurement signals produced by each of the detectors are received; from the excitation signal and the measurement signals the transfer function of the medium along each of the respective source-detector paths is determined; the differential transfer function of the medium between the two reference points is deduced. Other configurations can also be provided, particularly two sources and one detector, or the method can be applied to seismic reflection with waves having an oblique incidence or even a zero incidence.
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