Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1329p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Nov. 1989, p. 1329-1332. Research supported by the Harriman Fund.
Physics
14
Computer Aided Tomography, Earth Mantle, Seismic Waves, Surface Roughness, Surface Waves, Constraints, Earth Core, Earth Surface
Scientific paper
A set of inversion experiments is described that tests the ability of global surface wave tomography to retrieve long-wavelength upper mantle velocity structure in the presence of a modest level of rough structure. Upper-mantle model M84A, augmented with randomly-generated lateral structure to S(max) = 20, is used to calculate coupled-mode synthetic seismograms by means of the subspace projection method. The data kernels for path-integral data observables do not belong to the model space of allowable phase velocity perturbations, suggesting that constraints on model roughness in the inversion should lead to a better agreement with the long-wavelength part of the 'true' model than do the commonly-used constraints on model size. Coherence C between the inverted and the input model is enhanced by using roughness constraints. Estimation of perturbation size is more stable using roughness constraints, but is subject to a positive bias, especially for periods T greater than 200 s.
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