Audiomagnetotelluric measurements across the Lake Ladoga-Bothnian Bay zone in Central Finland

Summary. A group of 6 4 stations among 140 AMT tneasurenlent sites in Central Finland forms a profile about 220 km long. The profile starts from the Svecokarelidic orogeiiic belt (1 800- 1900 Ma) and traverses the Karelidic schist belt to the Presvecokarelidic basement (2600-2800 Ma). The data obtained are analysed and are presented as apparent resistivity profiles, pseudosections and residual profiles a i discrete frequcncies between 8 and 3700 Hz. The distribution of the measured apparent resistivities in the research area shows that there are observable differences between different geological units. A I- D interpretation is carried out at every station, after which a 2-D model is constructed for the whole profile and its AMT response is calculated numerically with the finite element technique.