Anisotropic seismic tomography: Potentials and pitfalls. Mark Panning University of Florida CIDER Research Talk 7/5/2010. Cartoon land motivation: tomography of scientists. What is seismic anisotropy?. ?. Origins of mantle anisotropy. Single crystal has anisotropic elastic properties.
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University of Florida
CIDER Research Talk 7/5/2010
Single crystal has anisotropic elastic properties
But large regions of the Earth appear nearly isotropic to seismic waves!
A random mix of orientations makes seismic waves see an isotropic average
Deformation can lead to preferential orientation (LPO) and seismic anisotropy
from Karato et al, 2008
from Becker et al, 2003
Sensitivity to strength and orientation of anisotropy depends on the starting model
Chevrot and Monteiller, 2009 synthetic tests with non-linear inversion of body wave splitting data
from Gaboret et al, 2003
from Becker, 2008
4%Upper mantle anisotropy
Correlation of ξ models above 350 km
Correlation of VS models above 350 km
From Bozdağ and Trampert, 2008
From Lekic et al, 2010
General pattern of radial anisotropy beneath oceanic and continental lithosphere remains. Ridge signature also remains.
New corrections – more regularization
New corrections – less regularization
Same dataset with linear corrections and longer wavelengths