Tomographic errors from wavefront healing: more than just a fast bias
Name
Malcolm-Tomographic.pdf
Size
2.17 MB
Format
Adobe PDF
Checksum (MD5)
8409ab69a685be3aa13aed86cc24a6d5
Author(s)
Malcolm, Alison E.
Trampert, Jeannot
Date Issued
February 2011
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1111/j.1365-246X.2011.04945.x
