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Shear wave velocities in the earth's mantle.Direct measurement of the travel time gradient for S waves together with travel time data are used to derive a shear velocity model for the earth's mantle. In order to satisfy the data it is necessary to discard the usual assumption of lateral homogeneity below shallow depths. A shear velocity differential is proposed for a region between western North America and areas of the Pacific Ocean. Distinctive features of the velocity model for the upper mantle beneath western North America are a low-velocity zone centered at 100 km depth and zones of high velocity gradient beginning at 400, 650, and 900 km.
Document ID
19720031912
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Robinson, R.
Kovach, R. L.
(Stanford University Stanford, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: Physics of the Earth and Planetary Interiors
Volume: 5
Subject Category
Geophysics
Accession Number
72A15578
Funding Number(s)
CONTRACT_GRANT: NGL-05-020-232
CONTRACT_GRANT: AF 49(638)-1687
Distribution Limits
Public
Copyright
Other

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