Three-dimensional inversion of magnetotelluric sounding data in the Southern Ladoga area

Abstract

The article presents the results of the interpretation of magnetotelluric soundings performed in the Southern Ladoga region. When performing the 3D inversion, both new data obtained by the LADOGA working group in 2018–2021 and data from the profile 1-EV (the “Loop” section) worked out in the early 2000s were used. Based on the results of automatic inversion performed in the ModEM program (Egbert and Albert), a three-dimensional geoelectric model of the earth’s crust to a depth of 60 km is constructed, which shows the complex heterogeneous structure of the studied territory.In the geoelectric model, two anomalous zones of core electrical conductivity of the south-eastern and north-eastern directions are distinguished, the first of which is a continuation of the well-known Ladoga anomaly. The presence of the second conducting structure confirms the results of single magnetovariational sounding performed by Igor Ivanovich Rokityansky in different parts of the East European Platform in the early 80s of the last century.