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Estimating anisotropy parameters and traveltimes in the tau-p domain

Van der Baan, M. and Kendall, J.M. (2002) Estimating anisotropy parameters and traveltimes in the tau-p domain. Geophysics, 67 (4). pp. 1076-1086. ISSN 0016-8033

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Abstract

The presence of anisotropy influences many aspects of seismic wave propagation and has therefore implications for conventional processing schemes. To estimate the anisotropy, we need both forward modelling and inversion tools. Exact forward modelling in anisotropic media is generally done by raytracing. However, we present a new and fast method, using the tau-p transform, to calculate exact P and SV reflection moveout curves in stratified, laterally homogeneous, anisotropic media which requires no ray tracing. Results are exact even if the SV-waves display cusps. In addition, we show how the same method can be used for parameter estimation. Since inversion for anisotropic parameters is very nonunique, we develop expressions requiring only a reduced number of parameters. Nevertheless, predictions using these expressions are more accurate than Taylor series expansions and are also able to handle cusps in the SV traveltime curves. In addition, layer stripping is a linear process. Therefore, both effective (average) and local (interval) estimates can be obtained.

Item Type: Article
Copyright, Publisher and Additional Information: © 2002 Society of Exploration Geophysicists
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 04 Mar 2005
Last Modified: 07 Jun 2014 18:09
Status: Published
Refereed: Yes
Identification Number: 10.1190/1.1500368
URI: http://eprints.whiterose.ac.uk/id/eprint/326

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