Other
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999natur.402...66l&link_type=abstract
Nature, Volume 402, Issue 6757, pp. 66-69 (1999).
Other
37
Scientific paper
Differential rotation of the Earth's inner core has been inferred by several seismic `body-wave' studies which indicate that the inner core is rotating at a rate between 0.2° and 3° per year faster than the Earth's crust and mantle. The wide range in inferred rotation rate is thought to be caused by the sensitivity of body-wave studies to local complexities in inner-core structure. Free-oscillation `splitting functions', on the other hand, are insensitive to local structure and therefore have the potential to estimate differential rotation more accurately. A previous free-oscillation study, however, was equivocal in its conclusions because of the relatively poor quality and coverage of the long-period digital data available 20 years ago. Here we use a method for analysing free oscillations which is insensitive to earthquake source, location and mechanism to constrain this differential rotation. We find that inner-core differential rotation is essentially zero over the past 20 years (to within +/-0.2° per year), implying that the inner core is probably gravitationally locked to the Earth's mantle.
Laske Gabi
Masters Guy
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