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Anisotropic models of the upper mantleLong period Rayleigh wave and Love wave dispersion data, particularly for oceanic areas, were not simultaneously satisfied by an isotropic structure. Available phase and group velocity data are inverted by a procedure which includes the effects of transverse anisotropy, an elastic dispersion, sphericity, and gravity. The resulting models, for the average Earth, average ocean and oceanic regions divided according to the age of the ocean floor, are quite different from previous results which ignore the above effects. The models show a low velocity zone with age dependent anisotropy and velocities higher than derived in previous surface wave studies. The correspondence between the anisotropy variation with age and a physical model based on flow aligned olivine is suggested.
Document ID
19840018114
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Regan, J. (California Inst. of Tech. Pasadena, CA, United States)
Anderson, D. L. (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 4, 2013
Publication Date
November 15, 1983
Subject Category
Geophysics
Report/Patent Number
NAS 1.26:173549
CIT-CONTRIB-4015
NASA-CR-173549
Accession Number
84N26182
Funding Number(s)
CONTRACT_GRANT: NSF EAR-81-15236
CONTRACT_GRANT: NSG-7610
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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