Statistics – Computation
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3421305k&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 21, CiteID L21305
Statistics
Computation
10
Seismology: Mantle (1212, 1213, 8124), Seismology: Core (1212, 1213, 8124), Geochemistry: Composition Of The Mantle, Seismology: Body Waves, Geochemistry: Mantle Processes (3621)
Scientific paper
The structure of the D'' region beneath the Arctic has not previously been studied in detail. Using waveform inversion, we find that the average S-wave velocity in D'' beneath the Arctic is about 0.04 km/s higher than PREM, which is consistent with the existence of post-perovskite (ppv) in D''. It is difficult to strongly constrain the fine structure of S-velocity within D'' due to the small number of stations at epicentral distances Δ < 90°, but by weighting those stations heavily in the inversion, we show that the data suggest the existence of high S-velocity in the upper half of D'' and low S-velocity in the lower half, consistent with the possibility of a double crossing (ppv -> pv reverse phase transition) within D''. We conduct a computational experiment to show that resolution of the velocity structure within D'' could be significantly improved by temporary installation of a portable array of seismographs in northern Canada, which would greatly increase the number of stations in the range 70° < Δ < 90°.
Fuji Nobuaki
Geller Robert J.
Kawai Kenji
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