Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001natur.410.1081n&link_type=abstract
Nature, Volume 410, Issue 6832, pp. 1081-1084 (2001).
Physics
52
Scientific paper
Knowledge of the seismic velocity structure at the top of the Earth's inner core is important for deciphering the physical processes responsible for inner-core growth. Previous global seismic studies have focused on structures found 100km or deeper within the inner core, with results for the uppermost 100km available for only isolated regions. Here we present constraints on seismic velocity variations just beneath the inner-core boundary, determined from the difference in travel time between waves reflected at the inner-core boundary and those transmitted through the inner core. We found that these travel-time residuals-observed on both global seismograph stations and several regional seismic networks-are systematically larger, by about 0.8s, for waves that sample the `eastern hemisphere' of the inner core (40°E to 180°E) compared to those that sample the `western hemisphere' (180°W to 40°E). These residuals show no correlation with the angle at which the waves traverse the inner core; this indicates that seismic anisotropy is not strong in this region and that the isotropic seismic velocity of the eastern hemisphere is about 0.8% higher than that of the western hemisphere.
Niu Fenglin
Wen Lianxing
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