Numerical Modelling of Magnetotelluric Soundings from the Central Volcanic Region

Abstract

Two-dimensional numerical models have been constructedfor two traverses across the eastern margin of the Central Volcanic Region. A detailed conductivity structure is required in the upper to fit the observational data. The principal feature of this near surface structure is that relatively conductive material is required at depth throughout the CVR. Crustal and upper mantle resistivity beneath the CVR is of the order of 250-1000 ohm-metres which indicates temperatures of around at quite shallow depths. The numerical models can be correlated quite well with tectonic models of the CVRbased on seismicand gravity data.