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Estimate of the Rigidity of Eclogite in the Lower Mantle From Waveform Modeling of Broadband S‐to‐P Wave Conversions
dc.contributor.authorHaugland, Samuel M.
dc.contributor.authorRitsema, Jeroen
dc.contributor.authorKaneshima, Satoshi
dc.contributor.authorThorne, Michael S.
dc.date.accessioned2018-02-05T16:27:35Z
dc.date.available2019-01-07T18:34:39Zen
dc.date.issued2017-12-16
dc.identifier.citationHaugland, Samuel M.; Ritsema, Jeroen; Kaneshima, Satoshi; Thorne, Michael S. (2017). "Estimate of the Rigidity of Eclogite in the Lower Mantle From Waveform Modeling of Broadband S‐to‐P Wave Conversions." Geophysical Research Letters 44(23): 11,778-11,784.
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/2027.42/141104
dc.description.abstractBroadband USArray recordings of the 21 July 2007 western Brazil earthquake (Mw=6.0; depth = 633 km) include high‐amplitude signals about 40 s, 75 s, and 100 s after the P wave arrival. They are consistent with S wave to P wave conversions in the mantle beneath northwestern South America. The signal at 100 s, denoted as S1750P, has the highest amplitude and is formed at 1,750 km depth based on slant‐stacking and semblance analysis. Waveform modeling using axisymmetric, finite difference synthetics indicates that S1750P is generated by a 10 km thick heterogeneity, presumably a fragment of subducted mid‐ocean ridge basalt in the lower mantle. The negative polarity of S1750P is a robust observation and constrains the shear velocity anomaly δVS of the heterogeneity to be negative. The amplitude of S1750P indicates that δVS is in the range from −1.6% to −12.4%. The large uncertainty in δVS is due to the large variability in the recorded S1750P amplitude and simplifications in the modeling of S1750P waveforms. The lower end of our estimate for δVS is consistent with ab initio calculations by Tsuchiya (2011), who estimated that δVS of eclogite at lower mantle pressure is between 0 and −2% due to shear softening from the poststishovite phase transition.Key PointsBroadband recordings of S‐P conversions allow for constraining compositional properties of deep Earth materialsStishovite is present in subducted eclogite and contributes to shear velocity softeningFragments of subducted oceanic crust are entrained in mantle flow and can be preserved at depths approaching 2,000 km
dc.publisherElsevier
dc.publisherWiley Periodicals, Inc.
dc.subject.otheroceanic crust
dc.subject.otherseismology
dc.subject.othereclogite
dc.subject.otherstishovite
dc.subject.othersubduction
dc.subject.otherS‐P conversion
dc.titleEstimate of the Rigidity of Eclogite in the Lower Mantle From Waveform Modeling of Broadband S‐to‐P Wave Conversions
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/141104/1/grl56669_am.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/141104/2/grl56642-sup-0002-supplementary.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/141104/3/grl56642-sup-0001-supplementary.pdf
dc.description.bitstreamurlhttps://deepblue.lib.umich.edu/bitstream/2027.42/141104/4/grl56669.pdf
dc.identifier.doi10.1002/2017GL075463
dc.identifier.sourceGeophysical Research Letters
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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