Angus, DA (2005) A one-way wave equation for modelling seismic waveform variations due to elastic heterogeneity. Geophysical Journal International, 162 (3). 882 - 898. ISSN 0956-540X
Abstract
The application of a new one-way narrow-angle elastic wave equation to isotropic heterogeneous media is described. This narrow-angle finite-difference propagator should provide an efficient and accurate method of simulating primary body wave(s) passing through smoothly varying heterogeneous media. Although computationally slower than ray theory, the narrow-angle propagator can model frequency-dependent forward diffraction and scattering as well as the averaging effects due to smooth variations in medium parameters that vary on the sub-Fresnel zone level. Example waveforms are presented for the propagation of body waves in deterministic as well as stochastic heterogeneous 3-D Earth models. Extrapolation within deterministic media will highlight various familiar wave-diffraction and pulse-distortion effects associated with large-scale inhomogeneities, such as geometrical spreading, wavefront folding and creeping-wave diffraction by a compact object. Simulation within stochastic media will examine the effects of varying the correlation lengths of random heterogeneities on wave propagation. In particular, wave phenomena such as frequency-dependent forward scattering, the appearance of random caustics and the generation of seismic coda will be shown.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2005, RAS. This is an author produced version of a paper published in Geophysical Journal International. Uploaded in accordance with the publisher's self-archiving policy |
Keywords: | body waves; finite differences; heterogeneity; one-way wave equation; seismic waveforms; 3-dimensional random-media; travel-times; anisotropic media; inhomogeneous-media; Helmholtz-equation; complex-screen; body waves; ray theory; propagation; scattering |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jan 2014 16:23 |
Last Modified: | 28 Mar 2018 21:40 |
Published Version: | http://dx.doi.org/10.1111/j.1365-246X.2005.02695.x |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1111/j.1365-246X.2005.02695.x |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:77395 |