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Upper mantle anisotropy - Evidence from free oscillationsThere is a growing body of evidence that much of the upper mantle may be anisotropic to the propagation of seismic waves. The present investigation shows that a small amount of anisotropy completely changes the nature of the surface wave and normal mode problem. In particular, the apparent lack of sensitivity of many of the spheroidal modes to the compressional velocity structure is due to the degeneracy in the isotropic case. The normal mode data set appears to be adequate to resolve the five elastic constants of a transversely isotropic upper mantle. Dziewonski and Anderson (1981) have shown that these data can be fitted with anisotropy restricted to the upper 200 km of the mantle.
Document ID
19820062793
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Anderson, D. L.
(California Institute of Technology Pasadena, CA, United States)
Dziewonski, A. M.
(Harvard University Cambridge, MA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Publication Information
Publication: Geophysical Journal
Volume: 69
Subject Category
Geophysics
Accession Number
82A46328
Funding Number(s)
CONTRACT_GRANT: NSF EAR-78-05353
CONTRACT_GRANT: NSG-7610
CONTRACT_GRANT: NSF EAR-77-14675
Distribution Limits
Public
Copyright
Other

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