Title: Upper mantle models from ‘pure-path’ dispersion data
Abstract: Journal of Geophysical Research (1896-1977)Volume 76, Issue 11 p. 2587-2601 Upper mantle models from 'pure-path' dispersion data Adam M. Dziewonski, Adam M. DziewonskiSearch for more papers by this author Adam M. Dziewonski, Adam M. DziewonskiSearch for more papers by this author First published: 10 April 1971 https://doi.org/10.1029/JB076i011p02587Citations: 128AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract 'Pure-path' phase and group velocities of mantle Rayleigh waves in combination with mantle Love wave velocities and worldwide averages of free oscillation data are used to derive upper mantle models with the smallest possible number of parameters. The shear-velocity solutions between the crust-mantle boundary and 400 km appear to be unique for an assumed set of averaging lengths, despite the fact that the density solutions are nonunique over the same depth interval. Oceanic models are characterized by a well-developed low-velocity zone. For the set of data used in this study, the thickness of the oceanic lithosphere proves to be a critical parameter that influences the density solutions. If the thickness of the lithosphere is 80 km or less, a reversal in density distribution is necessary to explain the data. If the thickness is 100 km or greater, the densities between 10 and 400 km can be represented by a single average value. The shield data do not require a low-velocity channel when the velocity in the lid is 4.60 km/sec or less, but they do require a low-velocity channel for higher Sn velocities. The characteristic feature of tectonic models is high shear velocity between 200 and 400 km (>4.80 km/sec). This feature could be explained by the thrust of oceanic lithosphere under tectonic regions. References Backus, G. E., F. Gilbert, Numerical applications of a formalism for geophysical inverse problems, Geophys. J., 13, 247–276, 1967. Backus, G. E., F. Gilbert, The resolving power of gross earth data, Geophys. J., 16, 169–205, 1968. Backus, G., F. Gilbert, Uniqueness in the inversion of inaccurate gross earth data, Phil. Trans. Roy. Soc. London, 266, 123–192, 1970. Bloch, S., A. L. Hales, M. 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Green, An experimental investigation of the gabbro-eclogite transformation and some geophysical implications, Tectonophysics, 3, 383–427, 1966. Toksöz, M. N., D. L. Anderson, Phase velocities of long-period surface waves and structure of the upper mantle, 1, Great circle Love and Rayleigh wave data, J. Geophys. Res., 71, 1649–1658, 1966. Wang, C., Density and constitution of the mantle, J. Geophys. Res., 75, 3264–3284, 1970. Citing Literature Volume76, Issue1110 April 1971Pages 2587-2601 ReferencesRelatedInformation
Publication Year: 1971
Publication Date: 1971-04-10
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 156
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