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Thermoelastic Dispersion and Attenuation of P and SV Wave Scattering by Aligned Fluid‐Saturated Cracks of Finite Thickness in an Isothermal Elastic Medium
Author(s) -
Wei Jia,
Fu LiYun,
Han Tongcheng,
Carcione José M.
Publication year - 2020
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2020jb019942
Subject(s) - thermoelastic damping , attenuation , scattering , materials science , dispersion (optics) , mechanics , classification of discontinuities , isotropy , dissipation , dispersion relation , condensed matter physics , optics , physics , thermal , thermodynamics , mathematics , mathematical analysis
P and SV wave scattering by thermally constrained saturated cracks couples elastic deformation with temperature. We estimate the scattering attenuation and velocity dispersion by aligned fluid‐saturated cracks with finite thickness, which are sparsely and randomly embedded in an isothermal and isotropic elastic medium. By incorporating thermoelastic effects into the representation theorem with the non‐interaction Foldy approximation, we formulate the dispersion and attenuation of P and SV waves induced by displacement discontinuities across aligned cracks constrained by a thermoelastic boundary condition. The frequency‐dependent response as a function of temperature is calculated for various P and SV wave incidence angles. The resulting scattering attenuation and dispersion are compared with those of the conventional aligned‐crack model. The examples show that the dissipation increases with increasing temperature, but the scattering is inhibited at a given temperature. The P wave shows a strong sensitivity to temperature along the direction normal to the cracks, whereas the SV wave has an opposite behavior. This theory has the potential to assess the distribution of temperature from seismic attributes.