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Tomographic errors from wavefront healing: more than just a fast bias

Author(s)
Malcolm, Alison E.; Trampert, Jeannot
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Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/
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Abstract
Wave front healing, in which diffractions interfere with directly travelling waves causing a reduction in recorded traveltime delays, has been postulated to cause a bias towards faster estimated earth models. This paper reviews the theory from the mathematical physics community that explains the properties of diffractions and applies it to a suite of increasingly complicated numerical examples. We focus in particular on the elastic case and on the differences between P and S healing. We find that rather than introducing a systemic fast bias, wave front healing gives a more complicated bias in the results of traveltime tomography, with fast anomalies even manifesting themselves as slow anomalies in some situations. Of particular interest, we find that a negative correlation between the bulk and shear or compressional velocities may result to a large extend from healing.
Date issued
2011-02
URI
http://hdl.handle.net/1721.1/75750
Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Journal
Geophysical Journal International
Publisher
John Wiley & Sons, Inc.
Citation
Malcolm, Alison E., and Jeannot Trampert. “Tomographic Errors from Wave Front Healing: More Than Just a Fast Bias.” Geophysical Journal International 185.1 (2011): 385–402. Web.
Version: Author's final manuscript
ISSN
0956-540X
1365-246X

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