Dislocation damping and anisotropic seismic wave attenuation in earth's upper mantle

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dc.contributor.authorFarla, Robert
dc.contributor.authorJackson, Ian
dc.contributor.authorFitz Gerald, John
dc.contributor.authorFaul, Ulrich H
dc.contributor.authorZimmerman, M
dc.date.accessioned2015-12-10T23:03:09Z
dc.date.issued2012
dc.date.updated2016-02-24T09:30:32Z
dc.description.abstractCrystal defects form during tectonic deformation and are reactivated by the shear stress associated with passing seismic waves. Although these defects, known as dislocations, potentially contribute to the attenuation of seismic waves in Earth's upper mantle, evidence for dislocation damping from laboratory studies has been circumstantial. We experimentally determined the shear modulus and associated strain-energy dissipation in pre-deformed synthetic olivine aggregates under high pressures and temperatures. Enhanced high-temperature background dissipation occurred in specimens pre-deformed by dislocation creep in either compression or torsion, the enhancement being greater for prior deformation in torsion. These observations suggest the possibility of anisotropic attenuation in relatively coarse-grained rocks where olivine is or was deformed at relatively high stress by dislocation creep in Earth's upper mantle.
dc.identifier.issn0036-8075
dc.identifier.urihttp://hdl.handle.net/1885/62049
dc.publisherAmerican Association for the Advancement of Science
dc.sourceScience
dc.subjectKeywords: damping; deformation mechanism; dislocation; high pressure; high temperature; olivine; seismic wave; shear stress; tectonic setting; upper mantle; wave attenuation; anisotropy; article; attenuation; compression; dislocation; geology; laboratory; noise red
dc.titleDislocation damping and anisotropic seismic wave attenuation in earth's upper mantle
dc.typeJournal article
local.bibliographicCitation.issue6079
local.bibliographicCitation.lastpage335
local.bibliographicCitation.startpage332
local.contributor.affiliationFarla, Robert, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationJackson, Ian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFitz Gerald, John, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFaul, Ulrich H, Boston University
local.contributor.affiliationZimmerman, M, University of Minnesota
local.contributor.authoremailu7800055@anu.edu.au
local.contributor.authoruidFarla, Robert, u4354635
local.contributor.authoruidJackson, Ian, u7800055
local.contributor.authoruidFitz Gerald, John, u8001315
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
local.identifier.ariespublicationf5625xPUB663
local.identifier.citationvolume336
local.identifier.doi10.1126/science.1218318
local.identifier.scopusID2-s2.0-84859990782
local.identifier.thomsonID000302995400041
local.identifier.uidSubmittedByf5625
local.type.statusPublished Version

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