Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409314k&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 9, CiteID L09314
Physics
12
Geochemistry: Composition Of The Mantle, Seismology: Mantle (1212, 1213, 8124), Seismology: Body Waves, Seismology: Core (1212, 1213, 8124), Tectonophysics: Evolution Of The Earth (0325)
Scientific paper
We invert seismic body-wave waveform data for the vertical dependence of (isotropic) shear-velocity in the D'' layer beneath Central America, using the transverse components of relatively long period broadband waveforms (20-200 s) as data. Our models suggest that the S-velocity increase in D'' may be localized in the zone from 100-200 km above the core-mantle boundary (CMB), while the S-velocity does not significantly deviate from PREM in the zone from 0-100 km above the CMB. This suggests the possible existence of a double crossing (a reverse phase transition from post-perovskite back to perovskite) at a depth of 100 km above the CMB. Resolution tests indicate that our methods and data can resolve the vertical velocity profile within D'', and that the lower half of D'' is especially well resolved.
Fuji Nobuaki
Geller Robert J.
Kawai Kenji
Takeuchi Nozomu
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