Investigation of Geothermal Structures of the Kadidia Area, Indonesia, by Using Magnetotelluric Method

Abstract

During 2012 a magnetotelluric (MT) survey was carried out on the Kadidia geothermal area, Sulawesi Island, Indonesia, with the aim of defining the electrical resistivity structures related to geothermal system of the area. MT data were collected along S-N profiles and processed by using robust algorithms. Processed data were inverted and computed into two-dimensional models of resistivity and impedance phase. The interpretation of models revealed a good correlation between the features of the geothermal system and resistivity structures at depth. The models revealed a shallow low-resistivity region (at depth of about 0.5 – 1.25 km), which may indicate the existence the areal extension of the cap rocks of the geothermal system.