Computer Science
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985sci...229.1259r&link_type=abstract
Science (ISSN 0036-8075), vol. 229, Sept. 20, 1985, p. 1259-1261.
Computer Science
20
Geomorphology, Laser Range Finders, Polar Wandering (Geology), Root-Mean-Square Errors, Very Long Base Interferometry, Accuracy, Comparison, Earthquakes, Satellite Observation
Scientific paper
An important bound on the accuracy of modern techniques for monitoring polar motion is established by intercomparison of measurement series from two different observing techniques, very long baseline interferometry and satellite laser ranging. The root-mean-square differences between the estimates of the pole position from both techniques are shown to be only 2 milliseconds of arc (about 6 centimeters at one earth radius). In the absence of common systematic errors, these differences bound the total errors in both sets of estimates. An initial investigation did not reveal any clear signature in the pole position that seems to be associated with major earthquakes. Continued measurements at this level of accuracy hold promise for resolving long-standing arguments over such questions as the nature of the excitation mechanisms required to maintain the motion of the pole.
Carter William E.
Eanes Richard J.
Robertson Douglas S.
Schutz Bob E.
Tapley Byron D.
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