Galunggung volcano located on the southern side of Karaha-Bodas geothermal field also holds the potential for hosting geothermal prospect. Geoscience study has been previously carried out. Here, additional field observation was conducted which included geological observation and thermal manifestation. The still active Galunggung volcano potentially supplies the heat to the system according to the geology analysis and gravity data which needs to be confirmed by direct subsurface data. Only a small number of manifestations exist in this area. The situation differs significantly from the Karaha-Bodas field where the condition of manifestations is rather impressive. The manifestations are concentrated within the volcanic cone area, some are widely separated in the far southern area. The manifestations have quite distinct characteristics in both areas, where steam-heated springs with well-developed travertine deposits dominated the northern area manifestations, and peripheral chloride-bicarbonate springs with travertine deposits dominated the southern manifestations. The limited number of manifestations within the area makes it difficult to interpret the geohydrology and subsurface condition of the geothermal system. Additional extensive geophysics survey and analysis are needed up to the southern manifestation to accommodate unanswered questions of the extent of the system along with direct subsurface data afterward. The present study favors the possibility of clustered reservoirs existing in the geothermal area with the heat source situated in Mt. Galunggung and possibly near the southern area, and outflow represented by the thermal manifestation existence both in the north and south.

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