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Secular and Long-Term Variations of the Polar Motion

Published online by Cambridge University Press:  27 June 2016

E. Proverbio ,
F. Carta  and
F. Mazzoleni
E. Proverbio
Affiliation:
International Astronomical Station, Carloforte-Cagliari, Italy
F. Carta
Affiliation:
Astronomical Observatory, Brera-Milano, Italy
F. Mazzoleni
Affiliation:
Astronomical Observatory, Brera-Milano, Italy

Abstract

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An analysis on the secular motion of the pole has been carried out utilising the latitude observations of the ILS stations reduced to the ØII(i) system (Proverbio et al., 1969).

The existence of long periodic terms in the polar motion as found out by Markowitz (1960) was confirmed.

The secular displacement of the polar motion calculated abstracting from long period terms results 0″.00294 for year along the meridian 65°.6 W.

A probable drift of continental blocks with average Northward rate of 1–2 cm/year for Eurasia and 1 cm/year for North America has been suggested. The possible drift emphasized for Japan is on the contrary of 1 cm/year southwards.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 48: Rotation of the Earth , 1972 , pp. 97 - 100
Copyright
Copyright © Reidel 1972 

References

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Proverbio, E., Carta, F., and Mazzoleni, F.: 1969, Contr. Obs. Astron. Milano, No. 319.Google Scholar
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