Secular polar motion,crustal movements,and international latitude service observations |
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| Authors: | Jan Vondrák |
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| Institution: | (1) Astronomical Institute, Acad. Sci. Czech Republic, Prague |
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| Abstract: | Summary The latitude variations observed by optical astrometry at five International Latitude Service (ILS) stations since the beginning of the century are analyzed to estimate the secular motion of the pole and the correction of the proper motions of the observed stars. The geophysical model of tectonic plate motions NUVEL-1 is used to correct the observed latitude drifts, thus referring the derived secular polar motion to the "no net rotation" terrestrial reference system. It is shown that one of the ILS stations, Ukiah (near the U.S. west coast), very probably exhibits an anomalous drift which differs significantly from the motion of both the Pacific and North American plates. |
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