Thermoconvective waves in the earth's mantle

Details Thermoconvective waves in the earth's mantle Thermoconvective waves in the earth's mantle

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...22..226b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 22, Issue 3-4, p. 226-237.

Physics

Scientific paper

The thermoconvective instability of the Earth's mantle is analysed. The mantle is modelled as an infinite horizontal layer with a free upper surface, heated from below. The creep in the mantle is supposed to be transient when strains are small. This transient creep is described by Lomnitz's law modified by Jeffreys (1958a). It is shown that disturbances, in the form of thermoconvective waves with a period of 108 - 109y and wavelength of the order 103 km, can propagate through the mantle without attenuation. These waves induce oscillations of the Earth's surface. The pattern of flows differs greatly from that suggested by plate tectonics. An attempt is made to give a new explanation for the linear magnetic anomalies over oceanic ridges.

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