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

Details Changes in the Earth's rotation and low-degree gravitational field induced by earthquakes. Changes in the Earth's rotation and low-degree gravitational field induced by earthquakes.

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987geoji..91..569c&link_type=abstract

Geophysical Journal International, Vol. 91, No. 3, p. 569 - 596

Physics

4

Earth Rotation:Variations, Earth:Gravitation, Gravitation:Earth

Scientific paper

The change in the Earth's density distribution caused by an earthquake dislocation will change the Earth's rotation and gravitational field. In this paper the authors first develop the analytical formulae based on the normal-mode theory. Equipped with these formulae and using a spherically symmetric earth model (1066B) and the centroid-moment tensor solutions for earthquake sources, they then compute the earthquake-induced changes in the Earth's rotation (polar motion and length of day) and low-degree harmonics of the gravitational field for the period 1977 - 85 (altogether 2146 earthquakes). The authors then conduct simple spectral and statistical analyses on these changes.

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