Numerical modeling of PP- and PS-wave azimuthal anisotropy in HTI media

Qian, Zhong-Ping; Zhang, Shao-Hua; Zhao, Bo; Lei, Na; Li, Xiang-Yang. 2012 Numerical modeling of PP- and PS-wave azimuthal anisotropy in HTI media. Applied Geophysics, 9 (4). 429-439. 10.1007/s11770-012-0355-z

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Abstract/Summary

This study focuses on the factors that may affect the feasibility of performing elliptical anisotropy analysis on azimuthal PP- and PS-wave data in HTI media, with the aim of using the modeling results as guidance in real seismic data application. Our results reveal that there is an offset limitation for both PP- and PS-waves in elliptical anisotropy fitting, and that PS-waves show a wider applicable offset range and larger observable azimuthal anisotropy than PP-waves. The major axis of the elliptical fit to the amplitudes of the R-component is perpendicular to the fracture strike, which is opposite to that in PP-wave analysis. The azimuthal interval travel time of PS-waves shows a nearly elliptical distribution and the major axis of the fit ellipse is perpendicular to the fracture strike, which is same as that in PP-wave analysis. For data within the applicable offset range, the anisotropic magnitude obtained from amplitude and travel time attributes of PP- and PS-waves exhibits a dependence on fracture density, and the major to minor axis ratio of the fit ellipse may be used to infer the relative distribution of fracture densities.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/s11770-012-0355-z
Programmes:	BGS Programmes 2010 > Earth hazards and systems
ISSN:	1672-7975
Date made live:	18 Mar 2013 16:51 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/500521

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