Computer Science
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109..621c&link_type=abstract
Earth and Planetary Science Letters, Volume 109, Issue 3, p. 621-632.
Computer Science
19
Scientific paper
The motion of surficial plates can be split into two terms: the toroidal field related to shear between plates or to spin around their centres and the poloidal field associated with horizontal divergence at ridges and subductions. Recent papers have suggested that the present-day plate motion minimizes the ratio of toroidal to poloidal energies [1] and that the existence of a global lithospheric rotation results from viscosity variations between oceans and continents [2]. This paper tests and confirms these two hypotheses using plate reconstructions during Cenozoic time. The partition of energy between the two modes always favours the poloidal velocities. The global rotation computed using a viscosity one order of magnitude lower below oceans than below continents agrees with observations. The existence of a non-linear rheology in a uniform asthenosphere leads to a satisfactory location of the global lithospheric rotation but with too small an amplitude.
Cadek Ondřej
Ricard Yanick
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