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Wave propagation and the frequency domain Green's functions in viscoelastic Biot/squirt (BISQ) media

Yang, Dinghui; Shen, Yiqing; Liu, Enru. 2007 Wave propagation and the frequency domain Green's functions in viscoelastic Biot/squirt (BISQ) media. International Journal of Solids and Structures, 44 (14-15). 4784-4794. 10.1016/j.ijsolstr.2006.12.001

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Abstract/Summary

In this paper, we examine the characteristics of elastic wave propagation in viscoelastic porous media, which contain simultaneously both the Biot-flow and the squirt-flow mechanisms (BISQ). The frequency-domain Green’s functions for viscoelastic BISQ media are then derived based on the classic potential function methods. Our numerical results show that S-waves are only affected by viscoelasticity, but not by squirt-flows. However, the phase velocity and attenuation of fast P-waves are seriously influenced by both viscoelasticity and squirt-flows; and there exist two peaks in the attenuation-frequency variations of fast P-waves. In the low-frequency range, the squirt-flow characteristic length, not viscoelasticity, affects the phase velocity of slow P-waves, whereas it is opposite in the high-frequency range. As to the contribution of potential functions of two types of compressional waves to the Green’s function, the squirt-flow length has a small effect, and the effects of viscoelastic parameter are mainly in the higher frequency range.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.ijsolstr.2006.12.001
Programmes: BGS Programmes > Seismology and Geomagnetism
Date made live: 02 Jul 2012 13:03
URI: http://nora.nerc.ac.uk/id/eprint/18582

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