Modeling of subsurface structure by using magnetic methods in the area of Mt. Pandan, Indonesia

Abstract Mount Pandan is an active volcano with geothermal phenomena and located in tectonically East Java, Indonesia. We conducted a geomagnetic study around to obtain further information about fault structures prospects. established 245 observation stations covering area of 20 km 2 . calculated the magnetic anomalies, applied upward continuation reduction pole, improved normalized horizontal tilt angle interpret area. Furthermore, modeling was performed that included previous research. Our identified NW–SE-, SW-NE-, W-E-trending might be affected by Kendeng thrust act as pathways for fluid flow. This estimated flow from southern between Wilis toward north. There are several hot springs Tirtohusodo spring near Wilis. Thus, heat source may supply systems both volcanoes. The results show intrusion andesite-type bodies at summit northern part found low anomalies indicate heated region potential reservoir system interpreted tuffaceous sandstone Kalibeng Formation claystone Klitik clay caprock.