SUBSURFACE STRUCTURE INTERPRETATION OF TANGKUBAN PERAHU VOLCANO AREA USING MAGNETIC METHOD

• Main Author: Fadlurrahman Wahdi, Nadif
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71640
• Institution: Institut Teknologi Bandung

Indonesia is located on the ring of fire because its geographic location, so thus Indonesia has most active volcanoes in the world. This volcanoes formed because of the collision of two plates, oceanic plate and continental plate. One of the active volcanoes in Indonesia is Mount Tangkuban Perahu. This active volcano located 20 km from the north of Bandung city, the capital city of West Java. Several geophysics methods are used to determine the subsurface structure of Mount Tangkuban Perahu, and of them is magnetic method. Magnetic method is one of the geophysical methods to determine the suseptability ditribution of the geological structure beneath the earth’s surface. Because the value of magnetic susaptability varies depends on the temperature, so this method is chosen to determine the magnetic anomaly due to high temperature around the Mount Tangkuban Perahu area. The goal of this research is to interprate the subsurface structure around the area of Mount Tangkuban Perahu using forward modelling of the magnetic data have been gotten. Data acquisition have been done by measuring the intensity of the magnetic field in 24 stations along the crater. Then, the data is processed with diurnal correction and IGRF correction. After processing the data, the modelling is done by using forward modelling. The result from data acquisation, it can be seen that the magnetic anomaly is in the range of -561.3 to 231 nT distributed along the crater. The forward modelling result shows that there are several susceptability underneath the surface including negative susceptability within the depth of 1411.08 m beneath the crater area. The negative anomaly is happening because the demagnetization process due to the high temperature.