Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29o..39t&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 15, pp. 39-1, CiteID 1749, DOI 10.1029/2002GL015369
Physics
3
Physical Properties Of Rocks: Fracture And Flow, Physical Properties Of Rocks: Microstructure, Physical Properties Of Rocks: Permeability And Porosity, Seismology: Theory And Modeling
Scientific paper
Evidence from a number of measurements support the idea that anisotropy, or shear wave splitting, exhibits a frequency dependence. This is generally attributed to properties of the microstructure of the rock and typically assumed to be the result of scattering from oriented inclusions within the rock mass. However, there are a number of competing mechanisms that may give rise to this observed frequency dependence. The scale length of the inclusions must be much smaller than the wavelength at which the measurements were conducted, in order for their presence to be observed as an effective anisotropy, and may therefore be insufficient to account for a significant frequency dependence from scattering. An alternative mechanism resulting in frequency dependence is the transfer of fluid between the inclusions, assumed to be fluid filled. Using a recently developed model, it is demonstrated that this fluid effect is potentially significant enough to explain observed frequency dependence.
Liu Enru
Tod Simon R.
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