Low-frequency dispersion and attenuation in partially saturated rocks

Research output: Contribution to journalArticle

202 Citations (Scopus)

Abstract

A theory is developed for the attenuation and dispersion of compressional waves in inhomogeneous fluid-saturated materials. These effects are caused by material inhomogeneity on length scales of the order of centimeters and may be most significant at seismic wave frequencies, i.e., on the order of 100 Hz. The micromechanism involves diffusion of pore fluid between different regions, and is most effective in a partially saturated medium in which liquid can diffuse into regions occupied by gas. The local fluid flow effects can be replaced on the macroscopic scale by an effective viscoelastic medium, and the form of the viscoelastic creep function is illustrated for a compressional wave propagating normal to a layered medium. The wave speeds in the low- and high-frequency limits are associated with conditions of uniform pressure and of uniform “no-flow,” respectively. These correspond to the isothermal and isentropic wave speeds in a disordered thermoelastic medium.

Original languageEnglish (US)
Pages (from-to)359-370
Number of pages12
JournalJournal of the Acoustical Society of America
Volume94
Issue number1
DOIs
StatePublished - Jan 1 1993

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attenuation
rocks
low frequencies
uniform flow
fluids
seismic waves
fluid flow
inhomogeneity
porosity
Rock
Attenuation
Waves
liquids
gases

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

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title = "Low-frequency dispersion and attenuation in partially saturated rocks",
abstract = "A theory is developed for the attenuation and dispersion of compressional waves in inhomogeneous fluid-saturated materials. These effects are caused by material inhomogeneity on length scales of the order of centimeters and may be most significant at seismic wave frequencies, i.e., on the order of 100 Hz. The micromechanism involves diffusion of pore fluid between different regions, and is most effective in a partially saturated medium in which liquid can diffuse into regions occupied by gas. The local fluid flow effects can be replaced on the macroscopic scale by an effective viscoelastic medium, and the form of the viscoelastic creep function is illustrated for a compressional wave propagating normal to a layered medium. The wave speeds in the low- and high-frequency limits are associated with conditions of uniform pressure and of uniform “no-flow,” respectively. These correspond to the isothermal and isentropic wave speeds in a disordered thermoelastic medium.",
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Low-frequency dispersion and attenuation in partially saturated rocks. / Norris, Andrew.

In: Journal of the Acoustical Society of America, Vol. 94, No. 1, 01.01.1993, p. 359-370.

Research output: Contribution to journalArticle

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