Geomagnetic Data Analysis to Identify Subsurface Condition of Gondang Area, Bojonegoro

Abstract The presence of manifestation in the Gondang indicates a specific geological condition. Those manifestations are Banyu Kuning Hot Spring, Selo Gajah and Jari Mud Burst. purpose this study, which was carried out near Mount Pandan, to identify distribution magnetic fields anomalies, including patterns potential geothermal energy region based on its magnetism. It also aimed explain rock structure area susceptibility values. survey conducted using 94 measuring points that were randomly distributed throughout area. data corrected IGRF diurnal correction, it examined Surfer 11 construct contour map Oasis Montaj visualize 3D models. According processed data, residual anomaly’s value ranges from -232.1 nT until 159.4 nT. For anomaly residual, 2D models demonstrated low dissemination values ranging -0.029 -0.0135 cgs zone. high value, is considered an intrusion rock, has range 0.011 0.046 cgs.