IDENTIFICATION OF SUBSURFACE STRUCTURE OF BALI ISLAND, INDONESIA WITH MAGNETIK AND GRAVITY METHODS

• Main Author: Billy Suryanata, Putu
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86669
• Institution: Institut Teknologi Bandung

Bali Island is one example of a volcanic arc located at the transition from the continental plate to the oceanic plate. This causes the uniqueness of the volcanic conditions of Bali Island. On Bali Island there are several volcanoes which are volcanic complexes that have had very violent eruptions in the past and recently there have been several swarm earthquakes and eruptions. Therefore, it is very important to know such as the source of volcanic magma, the moho layer under Bali Island, and why current volcanic activity is on Mount Agung based on the role of subsurface structures. That is why the magnetic and gravity methods used need to be carried out on the structure under Bali Island and magnetic anomaly analysis with Curie Point Depth (CPD) for Bali Island. Modeling using magnetic and gravity data produces a form of structure under the surface of Bali Island, namely in the form of layers of volcanic products from volcanoes on Bali Island, sedimentary layers consisting of carbonate and volcanic products, magma pockets, faults and others. Magnetic analysis using CPD is likely to correlate with the depth of the moho under Bali Island. And how the continuity of the carbonate-dominated sedimentary layer in the central part of Bali Island and its implications for the level of volcanic activity on Bali Island. So that the results of this study can later be used as additional information for the purposes of mitigating volcanic and earthquake disasters.