The investigation of the hydrothermal system distribution andidentification of its rock type has been done by CSAMT method at Ungaran Volcano area. The acquisition data has been done around 750 m x 100 m area with 4 lines at N750E direction. Sounding site distanced 250 m, whereas the data was measured by Stratagem model 26716-01 Rev.D. Processing of the data wasstarted by 1-D inversion of Robust method. The 1-D results were then used as the input of MT2D software. The results showed that subsurface resistivity were 8.6 to 46.4 Î©m estimated as hydrothermal system, 55.8 to 102.6 Î©m estimated as aquifer zone or permeable saturated zone, 145.3 to 495.7 Î©mÂ stimated as pra-caldera rock associated with vapor dominated zone, and 1420.5 to 15.083 Î©m estimated as lava pile associated with basaltic and andesitic rock. The most prospective hydrothermal system area existed at all along line 4 on 30 to 140 m depth.
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