Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29l..53n&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 12, pp. 53-1, CiteID 1611, DOI 10.1029/2001GL014118
Physics
7
Seismology: Core And Mantle, Seismology: Body Wave Propagation, Tectonophysics: Core Processes (1507)
Scientific paper
Depth variation in seismic anisotropy at the top 400 km of the inner core beneath the ``eastern'' hemisphere is investigated by comparing the differential travel times of PKP phases recorded at distances from 127° to 160°. At distances less than about 150°, there is no noticeable difference in differential travel times for PKP phases sampling both the polar and the equatorial paths. At greater distances, however, PKIKP phases arrive systematically earlier (about 0 ~ 0.5 second) in the polar path than in the equatorial path. These observations suggest that, in the ``eastern'' hemisphere, seismic anisotropy exists only in depths greater than about 200 km below the inner core boundary (ICB) with seismic velocities along the polar paths (an average of 27.6° from the earth's spin axis) being 0.4% faster than those along the equatorial paths.
Niu Fenglin
Wen Lianxing
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