Preliminary Study on Ground-Magnetic Data Near the Active Volcanoes in Konga Bay, East Flores Indonesia

Southeast Asian Conference on Geophysics

Laesanpura, Agus^1 ; Dahrin, Darharta^1 ; Nurseptian, Ivan^2

Applied and Exploration Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung

40132, Indonesia^1

Institut Teknologi Bandung, Jalan Ganesha 10, Bandung

40132, Indonesia^2

关键词: Active volcanoes;    Fault structure;    Forward modelling;    Ground magnetic data;    Intriguing questions;    Magnetic anomalies;    Thermal anomalies;    Volcanic materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/62/1/012037/pdf
DOI  :  10.1088/1755-1315/62/1/012037

来源: IOP

【 摘 要 】

East Flores is part of Nusa Tenggara island belongs to volcanic arc zone, hence the active volcanoes surround the area about 60 × 50 square km. It is located at latitude south 8°30', and longitude east 122°45'. Geologically, the rock is mostly of volcanic material since Miocene age. The Intriguing question is where the volcanic feeder, pyroclastic, and how it vanish in subsurface. The magnetic data acquisitions were executed on land for 500 meter interval and denser through the bay surrounded by volcanoes. The combine reduction to pole and forward modelling is apply for serve interpretation using forward modelling technique. The two interpretation sections, show the body of magmatic may present at depth about 2 to 3 km. The observation show no significant decreasing or loosening of magnetic anomaly although near the active volcano. We suggest the thermal anomaly is just disturbing magnetic data in near surface but not in the depth one. Meanwhile the reduction to pole's section could distinguish the two group of rock. In assuming the layer is flat. The inferred peak of magmatic body near the existing volcano; and the active demagnetization associated through evidence of hot spring and inferred fault structure.