<![CDATA[Subsurface geological survey had been done in Ijen volcano, East Java based on gravity measurement. The data aquisition was taken using Gravitymeter LaCoste & Romberg type G-1053. Downward continuation is done by second vertical derivatif to appear deeper anomaly and determine the boundary structure. Bouguer anomaly is projected to flat plane and upward continuation is used to separate the regional and residual anomaly. The interpretation of residual anomaly was done of two slices were AB and CD showed that the increase of anomaly value was effect the intrusion of basalt rock (Ï=2.7-3.30 g/cm3) in Paltuding and Pondok Bunder.]]>
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