Wobble Excitation by Earthquakes in Real Earth Models

Details Wobble Excitation by Earthquakes in Real Earth Models Wobble Excitation by Earthquakes in Real Earth Models

Aug 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971natur.232..621s&link_type=abstract

Nature, Volume 232, Issue 5313, pp. 621-622 (1971).

Physics

Scientific paper

THERE have been several accounts recently1-4 describing connexions between polar motion and earthquakes. Because a simple correlation is of little significance unless a physical mechanism can be produced to explain it, the most important point discussed in these articles is the question of the efficacy of the mass displacements associated with major earthquakes in exciting the observed polar motion. We wish to report here calculations based on realistic Earth models. The elasticity theory of dislocations5, used to model earthquake displacement fields, has been generalized to take account of self-gravitation, the radial variation of elastic properties, density and gravity, initial hydrostatic stress and the presence of the liquid core. We have already reported initial results, giving the effect of such realistic Earth model displacement fields on the rotation6. Results of a later independent study have been reported by Dahlen7 and our complete study will be published elsewhere8.

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