Resistivity analysis of geothermal system at cubadak village west sumatera using magnetoteluric method

Abstract Cubadak area was located in depression zone of great Sumatra fault which affected by normal faults. Geothermal this characterized the appearance hot springs type chloride-bicarbonate on Cubadak, Sawah Mudik and Talu. The manifestation temperature is about 37,1° - 74,8° C. This study purpose to recontruct model subsurface geothermal system based MT data. Model 1-D processed apply Bostick inversion NLCG (Nonlinear Conjugate Gradient) for 2-D. result showed that lowest resistivity Southwest Northeast research area. Highest spread at West Northeast. composed caprock (2-10 ohm), reservoar (20-300 ohm) heat source (>300 ohm).