Anelastic degradation of acoustic pulses in rock

Gladwin M.T. and Stacey F.D. (1974) Anelastic degradation of acoustic pulses in rock. Physics of the Earth and Planetary Interiors, 8 4: 332-336. doi:10.1016/0031-9201(74)90041-7


Author Gladwin M.T.
Stacey F.D.
Title Anelastic degradation of acoustic pulses in rock
Journal name Physics of the Earth and Planetary Interiors   Check publisher's open access policy
ISSN 0031-9201
Publication date 1974
Sub-type Article (original research)
DOI 10.1016/0031-9201(74)90041-7
Volume 8
Issue 4
Start page 332
End page 336
Total pages 5
Subject 1908 Geophysics
1912 Space and Planetary Science
3101 Physics and Astronomy (miscellaneous)
3103 Astronomy and Astrophysics
Abstract Measurements on acoustic pulses propagating in massive rock lead to a simple empirical relationship between the pulse rise time, τ and the time of propagation of a pulse, t: τ=τ0+C ∫ ) TQ-1dt where τ0 is the initial rise time (at t = 0), Q is the anelastic parameter which may be expressed in terms of the fractional loss of energy per cycle of a sinusoidal wave, Q = 2π(ΔE/E)-1, and is assumed to be essentially independent of frequency, and C is a constant whose value we estimate experimentally to be 0.53 ± 0.04. Of the linear theories of seismic pulse attenuation, model 2 of Azimi et al. (1968) is favoured. Pulse shapes computed from equations of Futterman (1962) also give C = 0.5, but the pulse arrives earlier than in a non-attenuating medium with the same elasticity and density. Pulse shapes calculated using Strick's (1967, 1970, 1971) theory give values of C incompatible with our results. The observations suggest that a method of estimating the Q-structure of the earth from seismic pulse rise times may have a particular advantage over the spectral ratio method.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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