Planet Within a Planet: Rotation of the Inner Core of Earth

Details Planet Within a Planet: Rotation of the Inner Core of Earth Planet Within a Planet: Rotation of the Inner Core of Earth

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...274.1883s&link_type=abstract

Science, Volume 274, Issue 5294, pp. 1883-1887

Mathematics

Logic

76

Scientific paper

The time dependence of the orientation of Earth's inner core relative to the mantle was determined using a recently discovered 10-degree tilt in the axis of symmetry of the inner core's seismic-velocity anisotropy. Two methods of analyzing travel-time variations for rays traversing the inner core, on the basis of 29 years of data from the International Seismological Centre (1964-1992), reveal that the inner core appears to rotate about 3 degrees per year faster than the mantle. An anomalous variation in inner-core orientation from 1969 to 1973 coincides in time with a sudden change ("jerk") in the geomagnetic field.

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