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Seismic attenuation due to wave‐induced flow: Why Q in random structures scales differently
Author(s) -
Müller T. M.,
Rothert E.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026789
Subject(s) - attenuation , dissipation , porous medium , wave propagation , geology , porosity , seismic wave , mechanics , anelastic attenuation factor , flow (mathematics) , geophysics , physics , geotechnical engineering , optics , thermodynamics
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.