SUBSURFACE MODELLING OF THE TANGKUBAN PARAHU VOLCANO USING GRAVITY METHOD

• Main Author: DWAYNE HAHIJARY (NIM: 12311009), MICHAEL
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23064
• Institution: Institut Teknologi Bandung

Gravity method is a non-invasive geophysical method that measures the difference in Earth’s gravitational field at certain locations. This method can be applied in <br /> <br /> <br /> various engineering and environmental studies. The success of the gravity method application depends on subsurface materials containing various bulk densities <br /> <br /> <br /> that may produce variations in the measured gravity field. <br /> <br /> <br /> Tangkuban Parahu is an active stratovolcano with a summit located 2,081 m above sea level situated in the Sunda caldera, situated 30 km north of the city of <br /> <br /> <br /> Bandung in the province of West Java, Indonesia. The objectives of this study are to create the Residual Bouguer Anomaly map utilizing the Complete Bouguer Anomaly Map of Tangkuban Parahu, and to map the subsurface structure of Tangkuban Parahu using the Residual Bouguer Anomaly map, supported by relevant geological information. The Complete Bouguer Anomaly Map has a range of gravity readings between 0 to +48 mGal, with high anomalies situated at the southwest of Tangkuban Parahu, and low anomalies located in the west. The Regional Bouguer Anomaly Map has a similar range of anomalies to the Complete Bouguer Anomaly Map, that is between +2 and +48 mGal, and the Residual Bouguer Anomaly Map has an anomaly range between -4.56 and +5.25 <br /> <br /> <br /> mGal. The 2.5-dimensional forward modelling results in a magma chamber that is located almost directly underneath the summit.