Physics – Geophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..181p&link_type=abstract
Geophysical Research Letters, vol. 10, Mar. 1983, p. 181-184.
Physics
Geophysics
37
Continents, Geophysics, Glaciers, Lithosphere, Polar Wandering (Geology), Rates (Per Time), Secular Variations, Thickness, Viscosity
Scientific paper
Geophysical data are presented which strongly suggest a continental lithospheric thickness in excess of 250 km. The data are based on the polar motion record collected by the International Latitude Service since 1900. It is found that the dominant oscillatory signal produced by the 7 year beat between the 14 month Chandler wobble and the 12 month annual wobble is superimposed upon a secular drift which analysis shows corresponds to a polar wander speed of approximately 0.95 degrees/10 to the 6th years with the vector directed towards the centroid of the ancient Laurentide ice sheet. It is determined that this secular drift can be understood as a consequence of the rotational forcing due to deglaciation and that in order to fit the observed drift speed and direction a continental lithospheric thickness somewhat in excess of 250 km is required.
Peltier Richard W.
Wu Patrick
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