Reevaluation of the Chandler wobble seismic excitation from recent data

Details Reevaluation of the Chandler wobble seismic excitation from recent data Reevaluation of the Chandler wobble seismic excitation from recent data

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..75..410s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 75, no. 4, Nov. 1985, p. 410-416.

Mathematics

27

Earthquakes, Polar Wandering (Geology), Seismology, Mathematical Models, Prediction Analysis Techniques, Remote Sensing, Secular Variations, Seismic Energy, Statistical Analysis, Tectonics

Scientific paper

Earth inertial tensor perturbation data related to seismic moment in the elastic dislocation theory were used to derive the synthetic Chandler wobble for the period 1977-1983, by applying Dashlen's method (1973) and the earth model (1968) for the calculations. The Chandler term derived from the cumulative effects of the 1287 strong and moderate earthquakes was then compared to the recorded polar shift data (provided by the Bureau International l'Heure) taken during the same period. The synthetic Chandler wobble curve did not fit the experimental data. It is concluded that the direct effect of earthquakes cannot be invoked to maintain the Chandler wobble because the seismic excitation is far too small (by about two orders of magnitude as recorded in the last two decades) to explain Chandler wobble variations.

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