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AGU: Geophysical Research Letters

 

Keywords

  • quality factor
  • anisotropy

Index Terms

  • Computational Geophysics: Numerical solutions
  • Computational Geophysics: Modeling
  • Physical Properties of Rocks: Wave attenuation
  • Computational Geophysics: Model verification and validation

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 37, L06302, 6 PP., 2010
doi:10.1029/2009GL042046

Q-anisotropy in finely-layered media

Stefano Picotti

Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Sgonico, Italy

José M. Carcione

Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Sgonico, Italy

Juan E. Santos

CONICET, Departamento de Geofísica Aplicada, Facultad Ciencias Astronómicas y Geofísicas, UNLP, La Plata, Argentina

Davide Gei

Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Sgonico, Italy

Finely layered media behaves as an anisotropic medium at long wavelengths. If the constituent media are anelastic, Q-anisotropy of qP, qSV and SH waves can be described by a generalization of Backus averaging to the lossy case. To test the theory, we introduce a novel method to obtain the complex and frequency-dependent stiffnesses from numerical simulations of oscillatory (harmonic) tests based on a space-frequency domain finite element method. We apply the methodology to a periodic sequence of shale and limestone and compute the quality factor and wave velocities as a function of frequency and propagation direction.

Received 5 December 2009; accepted 26 January 2010; published 19 March 2010.

Citation: Picotti, S., J. M. Carcione, J. E. Santos, and D. Gei (2010), Q-anisotropy in finely-layered media, Geophys. Res. Lett., 37, L06302, doi:10.1029/2009GL042046.

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