Thermal state and thermal regime of the earth's interior

Details Thermal state and thermal regime of the earth's interior Thermal state and thermal regime of the earth's interior

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41..133z&link_type=abstract

(International Association of Seismology and Physics of the Earth's Interior, Symposium on Physics of the Earth's Interior, Hyde

Physics

1

Convection, Earth Mantle, Geotemperature, Heat Flux, Magnetohydrodynamics, Ocean Bottom, Thermal Boundary Layer

Scientific paper

Convection in the earth's upper and lower mantle is studied. It is determined that the convection in the upper mantle is produced by heat flux from below and in the lower mantle by internal heating; the time of thermal relaxation for the upper mantle is approximately 10 to the 8th years and 1.5 x 10 to the 9th years for the lower mantle. Drops in the superadiabatic temperature in the upper mantle, top of the lower mantle, and the bottom of the lower mantle are calculated to be approximately less than 600 K, 650 K, and 650 K respectively. Adiabatic temperature at the core-mantle boundary is about 2900 K, therefore, it is concluded that the real temperature at the core-boundary is between 3500-4500 K. The three thermal boundary layers in the mantle are the super-heated zones and they correspond to the three zones of low mechanical quality for S waves. The relationships between the second thermal boundary layer and hot spots, and the thermal regime and instability of the third thermal boundary layer and the magnetohydrodynamics of the earth's core are examined.

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