Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2281r&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 11, p. 2281-2284
Physics
12
Seismology: Core And Mantle, Seismology: Theory And Modeling, Tectonophysics: Earth'S Interior-Composition And State
Scientific paper
Stacking of broadband shear waves (S) and short-period compressional waves (P) provides compelling evidence for the existence of a localized discontinuous increase in both S and P wave velocity 230 km above the core-mantle boundary (CMB) beneath the central Pacific. Modeling indicates a 1.7% increase in S velocity (VS) and a 0.75% increase in P velocity (VP). Similar features have been detected intermittently on a global basis, but seldom with S and P structure being resolved in the same location. Previous evidence for anisotropy near the CMB beneath the central Pacific suggests that the discontinuity may be related to anisotropic fabrics induced by flow in the thermal boundary layer above the core.
Lay Thorne
Reasoner Colin
Revenaugh Justin
Russell Sara A.
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