2016
DOI: 10.18860/neu.v9i1.3664
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Interpretation of Bouguer Anomaly to Determine Fault and Subsurface Structure at Blawan-Ijen Geothermal Area

Abstract: Gravity survey has been acquired by Gravimeter Lacoste & Romberg G-1035 at Blawan-Ijen geothermal area. It was a focusing study from previous research. The residual Bouguer anomaly data was obtain after applying gravity data reduction, reduction to horizontal plane, and upward continuation. Result of Bouguer anomaly interpretation shows occurrence of new faults and their relative movement. Blawan fault (F1), F2, F3, and F6 are normal fault. Blawan fault is main fault controlling hot springs at Blawan-I… Show more

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“…The gravity data obtained from the measurement were in the form of counter reading, so they had to be converted into milli-Gals (mGal) units. After that, the gravity data corrections were performed, including tidal correction, drift correction, latitude correction, free air correction, Bouguer correction, and terrain correction [12,13]. After that, the Bouguer density (local density) was estimated at the study area using the Parasnis method [14,15].…”
Section: Methodsmentioning
confidence: 99%
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“…The gravity data obtained from the measurement were in the form of counter reading, so they had to be converted into milli-Gals (mGal) units. After that, the gravity data corrections were performed, including tidal correction, drift correction, latitude correction, free air correction, Bouguer correction, and terrain correction [12,13]. After that, the Bouguer density (local density) was estimated at the study area using the Parasnis method [14,15].…”
Section: Methodsmentioning
confidence: 99%
“…Intrusive igneous rocks generally have a high density. Several previous studies on geothermal fields and in potential mineral areas such as those conducted by Imam et al [29], Susilo et al [30], Azhari et al [13], Wachidah & Minarto [31], obtained the density of intrusive igneous rocks which are quite high, respectively, namely 2.84 g/cm 3 , 2.85 g/cm 3 and 3.30 g/cm 3 . Intrusive rock can breakthrough because the rising magma undergoes very slow freezing, and the magma is volatile, which causes it to be pushed up so that it breaks through the surrounding rock because it finds fractures or weak areas in the rock [30].…”
Section: Inversion Modelingmentioning
confidence: 98%