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Low‐frequency layer‐induced dispersion in a weak‐contrast vertically heterogeneous orthorhombic medium
- Source: Geophysical Prospecting, Volume 67, Issue 9 - Advances in Seismic Anisotropy, Oct 2019, p. 2269 - 2279
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- 04 Feb 2019
- 17 Apr 2019
- 11 Jun 2019
Abstract
ABSTRACT
In this paper, we consider wave propagation in a periodically layered medium with orthorhombic symmetry. The weak‐contrast approximation is utilized to derive the low‐frequency dispersion in effective properties for P, S1 and S2 waves. We show that the dispersion term for all effective properties is controlled by the second‐order contrasts in elastic properties from the layers. We also compute the sensitivity matrices for second‐ and fourth‐order coefficients from eigenvalues of frequency‐dependent system matrix associated with kinematic parameters for individual wave modes.
© 2019 European Association of Geoscientists & Engineers © 2019 European Association of Geoscientists & Engineers