Global plate tectonics and the secular motion of the pole

Details Global plate tectonics and the secular motion of the pole Global plate tectonics and the secular motion of the pole

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gpts.book.....s&link_type=abstract

Unknown

Physics

Geophysics

6

Earth (Planet), Magnetic Poles, Secular Variations, Tectonics, Crustal Fractures, Earth Axis, Geophysics

Scientific paper

Astronomical data compiled during the last 70 years by the international organizations providing the coordinates of the instantaneous pole clearly shows a persistent drift of the mean pole. The differential contributions to the earth's second-order tensor of inertia were obtained and applied, resulting in no significant displacement of the earth's principal axis. In view of the above, the effect that theoretical geophysical models for absolute plate velocities may have on an apparent displacement of the mean pole as a consequence of station drifting was analyzed. The investigation also reports new values for the crustal tensor of inertia (assuming an ellipsoidal earth) and the orientation of its axis of figure, reopening the old speculation of a possible sliding of the whole crustover the upper mantle, including the supporting geophysical and astronomic evidence.

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