Mapping of Fault and Hydrothermal System beneath the Seulawah Volcano Inferred from a Magnetotellurics Structure

Magnetotellurics (MT) is an important geophysical method for exploring geothermal systems, with the Earth resistivity obtained from MT proving to be useful hydrothermal imaging changes of system. In this research, we applied map system Seulawah Agam volcano in northern Sumatra, a site intended construction power plant estimated energy 230 Mwe. Herein, 3D measurements were carried out, covering entire area and various intersecting local faults Seulimeum segment NW–SE direction. Based on Occam 2D inversion, conductive anomaly (<10 ohm·m) near surface was identified response specific manifestation areas, including Heutsz crater side Cempaga southern side. A further also found at depth 1 km, which presumably due clay cap layer fluid reservoir below surface, where areas are formed locations (where fractures found) owing rising surface. The modeling revealed that lies 2 km higher 40–150 ohm·m, main target exploration. At same time, heat source zone magma located lie two locations, namely, centering area. clear structure via inversion used visualize flow originates zones, one consistent across all models reaches 5 south regional faulting segment. concluded has potential tapped into future.