Abstract
The Head-on method was developed for mapping of concealed resistivity anomalies in a special array, where a third current electrode C is additionally placed at a large distance but almost perpendicular to the Schlumberger array with current electrodes A and B. In this survey, the Head-on method was used for locating fracture zones in the Mataloko geothermal field, Flores Island, Indonesia. The results of Head-on apparent resistivity profiles have shown that the Wai Luja Fault is a normal fault trending in the NW-SE direction and dipping 53° north. The main geothermal manifestations, i.e., fumaroles, hot springs and altered rocks, in the Mataloko geothermal field are controlled by the Wai Luja Fault.
