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AGU: Geophysical Research Letters

 

Index Terms

  • Physical Properties of Rocks: Acoustic properties
  • Physical Properties of Rocks: Fracture and flow
  • Physical Properties of Rocks: Permeability and porosity
  • Physical Properties of Rocks: Transport properties
  • Physical Properties of Rocks: Wave attenuation

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L16305, 5 PP., 2006
doi:10.1029/2006GL026789

Seismic attenuation due to wave-induced flow: Why Q in random structures scales differently

T. M. Müller

Geophysikalisches Institut, Universität Karlsruhe, Karlsruhe, Germany

E. Rothert

Fachrichtung Geophysik, Freie Universität Berlin, Berlin, Germany

Wave-induced fluid flow is an important dissipation mechanism of seismic waves in heterogeneous porous solids and several models are reported to quantify the wave attenuation. However, its characteristic frequency dependence in randomly heterogeneous structures remains unclear. For a generic double-porosity structure the specific attenuation of compressional waves is computed from first principles. It is shown how contrasts in material properties and heterogeneity scales translate into characteristic frequency dependencies of attenuation. The results explain the observed discrepancy of the asymptotic behavior of seismic attenuation in layered porous media with periodic and random disorder.

Received 3 May 2006; accepted 12 July 2006; published 18 August 2006.

Citation: Müller, T. M., and E. Rothert (2006), Seismic attenuation due to wave-induced flow: Why Q in random structures scales differently, Geophys. Res. Lett., 33, L16305, doi:10.1029/2006GL026789.

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