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Fully nonlinear inversion of fundamental mode surface waves for a global crustal model
Author(s) -
Meier U.,
Curtis A.,
Trampert J.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030989
Subject(s) - geology , rayleigh wave , crust , surface wave , seismology , shear velocity , inversion (geology) , phase velocity , shear (geology) , love wave , group velocity , geodesy , upper crust , wave propagation , geophysics , mechanics , longitudinal wave , physics , tectonics , mechanical wave , petrology , optics , turbulence
We use neural networks to find 1‐dimensional marginal probability density functions (pdfs) of global crustal parameters. The information content of the full posterior and prior pdfs can quantify the extent to which a parameter is constrained by the data. We inverted fundamental mode Love and Rayleigh wave phase and group velocity maps for pdfs of crustal thickness and independently of vertically averaged crustal shear wave velocity. Using surface wave data with periods T > 35 s for phase velocities and T > 18 s for group velocities, Moho depth and vertically averaged shear wave velocity of continental crust are well constrained, but vertically averaged shear wave velocity of oceanic crust is not resolvable. The latter is a priori constrained by CRUST2.0. We show that the resulting model allows to compute global crustal corrections for surface wave tomography for periods T > 50 s for phase velocities and T > 60 s for group velocities.