Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...25..273v&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 25, Issue 3, p. 273-279.
Physics
9
Scientific paper
An important result of recent years is the normal resistivity profile. It was obtained by interpretation of the combined apparent resistivity curve (magnetotelluric sounding and geomagnetic deep sounding) for the East European platform. This profile has no highly conducting layer and resistivity is greater than 100 ohm-m at asthenospheric depths. It corresponds well with geothermal indications of the absence of partial melting beneath the Precambrian plates. Nearly the same profiles have been obtained for the Canadian shield, and the Siberian and Australian platforms. Investigations carried out in many ``hot'' regions confirm the existence of a well-developed low-resistivity asthenosphere. Partially molten zones have conductances of about several thousand Siemens in the Eastern Pacific, Iceland and in the North American rift zone. Magnetotelluric soundings show that in many continental areas the lower part of the crust has low resistivity, in the range 10-20 ohm-m. Usually this crustal conductive layer is observed in regions of recent activity. Its total conductivity changes from several hundred to several thousand S. Many investigators propose that the most natural explanation of this conductivity is water solutions.
It is necessary to note the distorting role of near-surface inhomogeneities. Local distortions can be eliminated by simple averaging of the experimental data. These average apparent resistivity curves are the starting point for the construction of deep geoelectrical models.
No associations
LandOfFree
Deep geoelectrical models: geological and electromagnetic principles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Deep geoelectrical models: geological and electromagnetic principles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deep geoelectrical models: geological and electromagnetic principles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1442806