Changes in the Earth's rotation and low‐degree gravitational field induced by earthquakes

  • Chao B
  • Gross R
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Abstract

Analytical formulas based on the normal-mode theory are used together with a spherically symmetric earth model and the centroid-moment tensor solutions for earthquake sources to compute the earthquake-induced changes in the earth's rotation and low-degree harmonics of the gravitational field for the period 1977-1985. Spectral and statistical analyses are conducted on these changes. It is found that the earthquake-induced changes are two orders of magnitude smaller than those observed; most of these changes show strong evidence of nonrandomness either in their polarity or in their directions.

Author-supplied keywords

  • earthquake
  • gravitational coefficients
  • length of day
  • normal mode
  • polar motion

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Authors

  • B. Fong Chao

  • Richard S. Gross

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