Physics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3115612l&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 15, CiteID L15612
Physics
17
Seismology: Body Wave Propagation, Seismology: Core And Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Earth'S Interior-Composition And State
Scientific paper
Broadband shear wave signals from 15 deep South American earthquakes reveal small-scale variations of the D'' shear velocity discontinuity beneath the Cocos Plate. Deconvolution by average event source wavelets allows multiple event and California station combinations to be double-array stacked in 4 geographically separate reflection point bins with lateral dimensions of about 200 km. Reflections from the top of D'' are apparent in all 4 bins, with significant variations in timing and strength relative to ScS. The data are compatible with a discontinuous shear velocity increase 264 km above the core-mantle boundary that varies laterally in strength from 0.9% to 2.6%, with corresponding lateral velocity variations within D''.
Garnero Edward J.
Lay Thome
Russell Sara A.
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