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2 Acta Geophysica Polonica

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Applying the horizontal spatial gradient method for the deep conductivity estimations in the Ukraine

Logvinov I.

Acta Geophysica Polonica

2002

Vol. 50, nr 4

567-573

The analysis of the long-period magnetovariation data obtained in the Ukraine and from the project PREPAN-95 are presented. The response functions have been estimated for the harmonics of daily variations for the periods of 4-24 hours using the horizontal spatial gradient method of the magnetic field components. These results together with data of the nearest geomagnetic observatories have given the possibility to compare the mantle geoelectrical structures for three different tectonic regions in the Ukraine. The greatest difference is observed between the Ukrainian shield and the Carpathians together with the Tornquist-Teisseyre zone.

Reconnaissance electromagnetic soundings on Bornholm

Jankowski J., Ernst T., Jóźwiak W., Lewandowski M., Abrahamsen N., Semenov V.

Acta Geophysica Polonica

2001

Vol. 49, nr 3

361-372

Two electromagnetic (magnetotelluric and geomagnetic) soundings have been made in the region of Bornholm Island (Denmark). The results of analysis suggest a very complicated, locally three-dimensional character of the conductivity distribution; however, we interpret the outcome of the soundings in terms of a two-dimensional model, additionally using other published results from the region under study. From the interpretation it follows that Bornholm belongs to the East European Platform, whereas from the south and from the west an influence of large sedimentary basins appears. The depth of the sedimentary basin adjoining the island to the south is probably much deeper than estimated so far. Also, geological structures at greater depth in this region of the Baltic Sea may be much more complicated than it could be assumed from a simple extrapolation of data obtained from the surface geology.