Simulation of lahar flow potensial hazards in seulawah agam volcano eruption-aceh

Abstract

Abstract Seulawah Agam volcano is an active stratovolcanic volcano located on Sumatra Island. During the decade following the phreatic eruption in 1839 up to now, there have only been a few small-scale increases in activity. The hazards associated with volcanic eruptions can be divided into primary hazards and secondary hazards. One type of significant secondary hazard is lahar flow. The consequences of this volcanic eruption must be overcome because the impact is the same as the main hazard, especially if efforts to overcome it are not taken seriously. Therefore, simulations are needed to understand the lahar flow patterns that can occur due to the eruption of the Seulawah Agam volcano. This lahar flow simulation is based on Digital Elevation Model (DEM) data, namely DEMNAS, and uses the LAHARZ application, which is based on Geographic Information Systems (GIS). The LAHARZ software is designed to calculate potential hazard zones exposed to lahar flows based on volume parameters. Lahar flow simulations were made in hydrological channels with several lahar volume scenarios, such as 1 x 105 m3, 1 x 106 m3, and 5 x 106 m3. The lahar volume estimate used is based on information from historical data on volcanic eruptions whose characteristics are almost the same as the Seulawah Agam volcano. This volume scenario shows differences in the extent of lahar flows and the size of the affected area. The results of this lahar flow simulation can be one of the first steps in efforts to mitigate the hazards of volcanic eruptions in the future.