Magnetotelluric 2D inversion and joint interpretation of MT, seismic, magnetic and gravity data from Masi, Kautokeino municipality, Finnmark

Abstract

Acquisition of Magnetotelluric (MT) data at Masi is a joint venture project between NGU and Westf\u00E4lische Wilhelms Universitat M\u00FCnster in Germany. The data was collected in 2015. The main objective is to understand the regional geology in the area and especially the settings of the postglacial Stuoragurra Fault. The project area has been extensively studied and a considerable amount of information about the geology is available. However, most of this information provides only knowledge of the shallow subsurface. Having a range of high to low frequencies, MT data has a great depth of penetration and is hence a useful tool in understanding the deep subsurface.Interpretation of the resistivity model was done by integrating the geological bedrock map, seismic section, 2D resistivity profiles, resistivity log and magnetic and gravity data. The deep structures observed in the MT model guided the interpretation of the gravity and magnetic data and hence minimized the number of possible models.