Experience of Magnetic Variation Sounding in the Arctic in the Laptev Sea Region
We present the results of magnetic variation soundings at two points—at the Tiksi Observatory and at the Kotelny Island in the region of the Laptev Sea of the Arctic—and their three-dimensional (3D) inversion using the ModEM program. In the models obtained by the inversion, the conductive heterogeneities are present in the regions of the both points down to a depth of 200 km in the region of the observatory and 100 km beneath the Kotelny Island. The geoelectric heterogeneities in the model in the region of the observatory are most contrasting and voluminous whereas beneath the island they are more localized. The correlation between the locations of these heterogeneities at both points and the peculiarities in the geological and geophysical structure of the region is noted. It is shown that the applied data processing algorithm removes the effect of the polar electrojet which makes it possible to study the geoelectric structure of the region by the magnetovariational method.