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Dolok Marawa geothermal field is one of geothermal prospect areas in northern part of Sumatera and situated in the Sumatera Fault Zone. Surface thermal features consist of hot spring with temperature varies from 37oC to 65oC. Series of gravity measurement had been conducted in the field in 2006 and 2015. The gravity data were measured from 257 stations covering an area of about 16 km x 13 km. This paper is aimed to identify rocks density distribution through 3-D gravity modeling by using Grablox modeling scheme. The model shows a pronounced low density block elongated at NW-SE direction, which coincides to the Sumatera fault lineament. Rock density of about 2.4 g/cm3 of the low zone is considered to be associated to fractured rocks filling the fault zone. The model also shows high density block beneath Mt. Dolok Bahtopu. This high is interpreted as an andesitic intrusive body and considered as the heat source of the Dolok Marawa

buletin sumber daya geologi/buletin sumber daya geologi

PEMODELAN GAYA BERAT 3D DAERAH PANAS BUMI DOLOK MARAWA KABUPATEN SIMALUNGUN, SUMATERA UTARA 3D GRAVITY MODELING OF DOLOK MARAWA GEOTHERMAL FIELD IN SIMALUNGUN REGENCY, NORTH SUMATERA