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The physics of creep and attenuation in the mantleThe objective is to investigate the role of dislocations in both creep and attenuation. Attenuation in the mantle at seismic frequencies is thought to be caused by the glide of dislocations in the subgrains. Both kink and impurity drag can contribute to the glide time constant. The kink-formation, or Peierls barrier, model for dislocation glide is seen as a low-temperature, high-frequency mechanism most appropriate for pure systems. It is noted that a small amount of impurity drag brings the dislocation glide characteristic time into the seismic band at upper-mantle temperatures. The attenuation and creep behavior of the mantle are related by way of the dislocation structure. Analysis of the various possible mechanisms is facilitated by casting them and the geophysical data in terms of a pre-exponential characteristic time and an activation energy.
Document ID
19820043050
Acquisition Source
Legacy CDMS
Document Type
Other - Collected Works
Authors
Anderson, D. L.
(California Inst. of Tech. Pasadena, CA, United States)
Minster, J. B.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1981
Subject Category
Geophysics
Accession Number
82A26585
Funding Number(s)
CONTRACT_GRANT: NSF EAR-77-14675
CONTRACT_GRANT: NSG-7610
Distribution Limits
Public
Copyright
Other

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