Identification of magnetic anomalies in subsurface area of Sinabung mountain

This research was conducted by using geomagnetic methods. It aims to identify cross section anomalies and subsurface models. Measurements using a PPM (Proton Precession Magnetometers) Elsec 770 types data collection is done randomly with 27 measurement points. Data analysis was performed using 11 surfers to get a contour map and Mag2DC software to get the magnetic anomaly cross section. The results showed that the anomalous cross section with the geomagnetic method has the lowest value of 18.45 nT and the highest value reached 64.92 nT. From the anomaly, it was found that the value of vulnerability obtained is 0.0004, 0.00018, 0.0002 emu where subsurface layer model consists of dolomite and limestone.