Theoretical and numerical results are presented for modal characteristics of the seismo-acoustic wavefield in anisotropic range-independent media. General anisotropy affects the form of the elastic-stiffness tensor, particle-motion polarization, the frequency and angular dispersion curves, and introduces near-degenerate modes. Horizontally polarized particle motion (SH) cannot be ignored when anisotropy is present for low-frequency modes having significant bottom interaction. The seismo-acoustic wavefield has polarizations in all three coordinate directions even in the absence of any scattering or heterogeneity. Even weak anisotropy may have a significant impact on seismo-acoustic wave propagation. Unlike isotropic and transversely isotropic media with a vertical symmetry axis where acoustic signals comprise P-SV modes alone (in the absence of any scattering), tilted TI media allow both quasi-P-SV and quasi-SH modes to carry seismo-acoustic energy. Discrete modes for an anisotropic medium are best described as generalized P-SV-SH modes with polarizations in all three Cartesian directions. Conversion to SH is a loss that will mimic acoustic attenuation. An in-water explosion will excite quasi-SH.
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July 2013
July 11 2013
Modal investigation of elastic anisotropy in shallow-water environments: Anisotropy beyond vertical transverse isotropy
Darin J. Soukup;
Darin J. Soukup
Department of Earth and Space Sciences
, University of Washington, 63 Johnson Hall, Box 351310, Seattle, Washington 98195
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Robert I. Odom;
Robert I. Odom
a)
Applied Physics Laboratory, University of Washington
, 1013 Northeast 40th Street, Seattle, Washington 98105
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Jeffrey Park
Jeffrey Park
Department of Geology and Geophysics
, P.O. Box 208109, Yale University, New Haven, Connecticut 06520-8109
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Acoust. Soc. Am. 134, 185–206 (2013)
Article history
Received:
November 18 2011
Accepted:
March 20 2013
Citation
Darin J. Soukup, Robert I. Odom, Jeffrey Park; Modal investigation of elastic anisotropy in shallow-water environments: Anisotropy beyond vertical transverse isotropy. J. Acoust. Soc. Am. 1 July 2013; 134 (1): 185–206. https://doi.org/10.1121/1.4809721
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