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Volume 65, Issue 5
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

The leading component of the high‐frequency asymptotic description of the wavefield, given by the travel time, is governed by the eikonal equation. In anisotropic media, traveltime measurements from seismic experiments conducted along one surface cannot constrain the long‐wavelength attribute of the medium along the orthogonal‐to‐the‐surface direction, as anisotropy introduces an independent parameter controlling wave propagation in the orthogonal direction. Since travel times measured on the Earth's surface in transversely isotropic media with a vertical symmetry axis are mainly insensitive to the absolute value of the anisotropic parameter responsible for relating these observations to depth δ, the travel time was perturbed laterally to investigate the traveltime sensitivity to lateral variations in δ. This formulation can be used to develop inversion strategies for lateral variations in δ in acoustic transversely isotropic media, as the surface‐recorded data are sensitive to it even if the model is described by the normal moveout velocity and horizontal velocity, or the anellipticity parameter η. Numerical tests demonstrate the enhanced sensitivity of our data when the model is parameterised with a lateral change in δ.

© 2017 European Association of Geoscientists & Engineers © 2016 European Association of Geoscientists & Engineers
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2016-12-16
2024-04-19

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Research Note: The sensitivity of surface seismic P‐wave data in transversely isotropic media to reflector depth
Geophysical Prospecting 65, 1398 (2017); https://doi.org/10.1111/1365-2478.12483
/content/journals/10.1111/1365-2478.12483
/content/journals/10.1111/1365-2478.12483
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  • Article Type: Research Article
Keyword(s): Anisotropy; Inversion; Travel time

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