An experiment of two-dimensional magneto-variational modeling in the area of UAS
"Academician Vernadskiy" (West Antarctic Peninsula)
© Logvinov I.M., Tarasov V.N., Chulkov S.S.
For the first time for the waters of the Antarctic Peninsula, quantitative assessment of the distribution of geoelectric parameters
of sea water, both in space and depth, as well as of a layer of sediment presumably of Cenozoic era, lying directly under the water has
been given. This layer according to the seismic method of reflected waves is widespread in the continental shelf waters. Availability under
the top layer of the older sedimentary rocks is still quite unknown. According to seismic and geo-electric methods at the present level
of knowledge the existence of such sediments is expected both in shelf zone of the Bellingshausen Sea, and in the Larsen sedimentary
basin. Based on the estimates of geoelectric parameters a map of the total longitudinal conductivity of sedimentary cover of M 1:10000000 of
the region has been compiled for the first time. Magnetovariational parameters on the profile, crossing the Antarctic archipelago of islands
have been given, which have shown that the conductive structures, which determine their behavior have a strike, coinciding with the strike
of isobaths. To determine the capacity of geoelectrical methods for studying the deep structure of the region calculations have been made
of interpretational parameters of magnetotelluric field by numerical simulation of two-dimensional model along the profile of the valley of the
Bellingshausen Sea to the kettle of the Weddell Sea, in which the distribution of geoelectric parameters of the sedimentary cover
has been specified with the highest adequacy. Calculations have shown that the observed experimental data do not completely satisfy the
model calculations. This fact gives grounds to hope that at least in the areas adjacent to Graham Land, geoelectrical investigations
will facilitate studies of the deep structure of the regions.
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