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2 Acta Geophysica Polonica

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Physical modeling of the induction vectors above the structures including 3d blocks in the crust

Ladanivsky B., Jankowski J., Ernst T., Kobzova V., Rusiniak L.

Acta Geophysica Polonica

2002

Vol. 50, nr 4

575-582

Space and frequency distributions of the induction vectors induced by the 2D subsurface conductive anomaly have been studied using the physical modeling in relation to the deeper 3D crust and 1D mantle structures. It was established that the influence of the 3D block structures of the crust on these vectors is less than the influence of conductivity of the deep mantle structures and than the contrast of resistivities between the sediments and the crust.

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.