The mechanical and electrical properties of earth's asthenosphere

Details The mechanical and electrical properties of earth's asthenosphere The mechanical and electrical properties of earth's asthenosphere

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...25..280t&link_type=abstract

(International Union of Geodesy and Geophysics, Symposium on Electrical Conductivity and the Characteristics of the Asthenospher

Physics

Geophysics

17

Earth Mantle, Earth Planetary Structure, Electrical Resistivity, Ground Water, Mechanical Properties, Rheology, Continental Drift, Heat Transfer, Seismology, Subduction (Geology), Viscous Flow, Volcanoes

Scientific paper

Minima observation in the electrical resistivity and the seismic dissipation function of the earth at a depth of approximately 100 km within the mantle are interpreted within the framework of heat transport theory and observations of large-scale surface motions. The recent understanding of the means by which convective heat transfer and effective viscosity interact to regulate the horizontally averaged viscosity at about 10 to the 21st poise is discussed, and new definitions of the lithosphere and the asthenosphere are presented which indicate that the various structures present at a depth of about 100 km are not associated with a transition between the two regions. It is argued that the earth and perhaps some other terrestrial planets are trapped in a state of the partial dehydration of amphiboles, and that the collection of a free water phase is t5 source of the structure at 100 km. It is pointed out that electrical conductivity studies appear to be most suitable for the investigation of the water trapping process and the possibility that the uptake of ocean water during subduction exceeds the rate of water loss through magmatic activity.

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