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Aspherical heterogeneity of the mantle from phase velocities of mantle wavesLong-period surface waves are used to map the lateral heterogeneity of the upper 100-600 km of the mantle. There is good correlation of velocity with surface tectonics and heat flow. Convergence regions are generally slow for Love waves and fast for Rayleigh waves. Back arc basins have slower than average shallow mantle. Some island arcs show evidence of fast material at greater depth. Deep-seated slow anomalies underlie the Red Sea-Afar region of north-east Africa, western North American-northern East Pacific Rise, Indian Ocean triple junction and the Tasman Sea-Campbell Plateau regions. The fastest regions are in the north central Australia-New Guinea and the South Atlantic.
Document ID
19840053891
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Nakanishi, I.
(California Inst. of Tech. Pasadena, CA, United States)
Anderson, D. L.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 12, 1984
Publication Information
Publication: Nature
Volume: 307
ISSN: 0028-0836
Subject Category
Geophysics
Accession Number
84A36678
Funding Number(s)
CONTRACT_GRANT: NSF EAR-81-15236
CONTRACT_GRANT: NSG-7610
Distribution Limits
Public
Copyright
Other

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