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 0016-8033Full text available as:
Available under licence : See the attached licence file.
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.
|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|