Computer Science
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000natur.405..445v&link_type=abstract
Nature, Volume 405, Issue 6785, pp. 445-448 (2000).
Computer Science
29
Scientific paper
The finding that the Earth's inner core might be rotating faster than the mantle has important implications for our understanding of core processes, including the generation of the Earth's magnetic field. But the reported signal is subtle-a change of about 0.01 s per year in the separation of two seismic waves with differing paths through the core. Subsequent studies of such data have generally supported the conclusion that differential rotation exists, but the difficulty of accurately locating historic earthquakes and possible biases induced by strong lateral variations in structure near the core-mantle boundary have raised doubt regarding the proposed inner-core motion. Also, a study of free oscillations constrained the motion to be relatively small compared to previous estimates and it has been proposed that the interaction of inner-core boundary topography and mantle heterogeneity might lock the inner core to the mantle. The recent detection of seismic waves scattered in the inner core suggests a simple test of inner-core motion. Here we compare scattered waves recorded in Montana, USA, from two closely located nuclear tests at Novaya Zemlya, USSR, in 1971 and 1974. The data show small but coherent changes in scattering which point toward an inner-core differential rotation rate of 0.15° per year-consistent with constraints imposed by the free-oscillation data.
Dodge Doug A.
Earle Paul S.
Vidale John E.
No associations
LandOfFree
Slow differential rotation of the Earth's inner core indicated by temporal changes in scattering does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Slow differential rotation of the Earth's inner core indicated by temporal changes in scattering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Slow differential rotation of the Earth's inner core indicated by temporal changes in scattering will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1199441