Tomographic errors from wavefront healing: more than just a fast bias
| Autor: | Malcolm, Alison E., Trampert, Jeannot |
|---|---|
| Přispěvatelé: | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Malcom, Alison E., Malcolm, Alison E. |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Zdroj: | Malcolm via Michael Noga |
| Popis: | 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. Netherlands Organization for Scientific Research (NWO:VICI865.03.007) |
| Databáze: | OpenAIRE |
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