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Related Experiment Videos

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

Su1, Dziewonski, Jeanloz

  • 1W.-J. Su and A. M. Dziewonski, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. R. Jeanloz, Department of Geology and Geophysics, University of California, Berkeley, CA 94720-4767, USA.

Science (New York, N.Y.)
|December 13, 1996
PubMed
Summary

Earth's inner core rotates faster than the mantle, at about 3 degrees per year. This rotation speed correlates with changes in the geomagnetic field, particularly a "jerk" event.

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Area of Science:

  • Geophysics
  • Seismology
  • Earth Science

Background:

  • The Earth's inner core exhibits seismic-velocity anisotropy.
  • A 10-degree tilt in the inner core's symmetry axis has been identified.

Purpose of the Study:

  • To determine the time-dependent orientation of Earth's inner core relative to the mantle.
  • To investigate the relationship between inner core rotation and geomagnetic field variations.

Main Methods:

  • Analysis of travel-time variations for seismic rays traversing the inner core.
  • Utilizing 29 years of data from the International Seismological Centre (1964-1992).

Main Results:

  • The inner core rotates approximately 3 degrees per year faster than the mantle.

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  • An anomalous variation in inner core orientation between 1969 and 1973 was observed.

    • Conclusions:

    • The observed inner core rotation provides insights into its dynamics relative to the mantle.
    • The anomalous inner core orientation coincides with a geomagnetic field "jerk" event, suggesting a potential link.