Magnetotelluric and seismic evidences for crust-mantle heterogeneities

Details Magnetotelluric and seismic evidences for crust-mantle heterogeneities Magnetotelluric and seismic evidences for crust-mantle heterogeneities

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41..143r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 41, Issue 2-3, p. 143-153.

Physics

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Scientific paper

Based on published results, an attempt has been made to correlate the electrical conductivities and seismic velocities obtained from magnetotelluric (MT) sounding, geomagnetic depth sounding (GDS), earthquakes, deep nuclear explosions and dispersion of surface waves. The correlation profile extends from the Scandinavian Shield to Mariana Islands, and passes through parts of Europe, the Atlantic Ocean, Canada, the U.S.A., the Pacific Ocean and Hawaiian Islands. Inverted MT, GDS and seismic data are plotted against depth on a regional scale to obtain geoelectric and seismic sections. Regional variation of the depth of the Moho is shown. Large scale lateral crust-mantle heterogeneities along with the tectonically active zones are broadly reflected in these sections. HCLs (high conductivity layers) and LVZs (low velocity zones) are delineated. Phase transition of silicates may explain the electrical conductivity and seismic velocity changes at a depth of about 400 km. The western U.S.A. (Basin and Range province, Colorado Plateau) near the East Pacific Rise reveals significant lateral variations along with a few partial melt pockets. Heterogeneities extend up to 1000 km. A tentative temperature section has been constructed based on the electrical conductivities of the probable components.
Now at the Physical Research Laboratory, Navrangpura, Ahmedabad, India.

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