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Title:
Planet Within a Planet: Rotation of the Inner Core of Earth
Authors:
Su, Wei-Jia; Dziewonski, Adam M.; Jeanloz, Raymond
Publication:
Science, Volume 274, Issue 5294, pp. 1883-1887
Publication Date:
12/1996
Origin:
JSTOR
DOI:
10.1126/science.274.5294.1883
Bibliographic Code:
1996Sci...274.1883S

Abstract

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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