Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41..138z&link_type=abstract
(International Association of Seismology and Physics of the Earth's Interior, Symposium on Physics of the Earth's Interior, Hyde
Physics
2
Convection, Earth Core, Earth Mantle, Geotemperature, Thermal Boundary Layer, Anomalous Temperature Zones, Seismic Waves, Taylor Instability, Viscosity
Scientific paper
The convective instability of zone D, which is approximately 200 km at the bottom of the mantle, is investigated. The mantle viscosity, and temperature and density variations at the core-mantle boundary are analyzed. The possibility of the Rayleigh-Taylor instability in the boundary layer is estimated by comparing density increments due to pressure with density increments due to temperature increases. The time of formation of the hot unstable layer is evaluated by using the modified Howard theory (1964) for the formation of a thermal at a hot boundary; the time of formation at the core-mantle boundary is calculated to be approximately 10 to the 8th years. It is concluded that the reduced seismic velocities, reduced mechanical quality, and mechanical inhomogeneity of zone D can be explained by the thermal structure of the layer which is inhomogeneous with characteristic scales of 10-100 km.
Karpov P. B.
Leont'ev V. V.
Zharkov Vladimir Naumovich
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