120Satria BIJAKSANA121Nurrohman WIJAYA122Asep SAEPULOHCharacterization of Lithogenic and Anthropogenic Minerals on Surface Sediments of Lake Batur, Bali, Based on Magnetic and Geochemical Parameters(Project 2023)Assessing Ocean Renewable Energy Potential for Blue Economy Development in West Java Province, Indonesia(Project 2023)Mitigating the Effect of Volcanic Hazards to Environment Using Cloud System of LiCSBAS InSAR at Mt. Sinabung(Project 2023)83Lake Batur is one of the caldera lakes in Bali, Indonesia, whose existence is important because it relates to residential, tourism, agricultural, fishing, and religious activities. The existence of activity around the lake also affects changes in the environmental conditions of the lake. This study will identify lithogenic and anthropogenic components in the sediments of the surface of Lake Batur using rock magnetism and geochemical approaches. Sediment samples studied came from surface sediments at the bottom of the lake and several centers of human activity on land around the lake. This study is expected to show the presence of heavy metal minerals and REE in Lake Batur and the concentration of each mineral. In addition, it can distinguish between lithogenic and anthropogenic components in the surface sediments of Lake Batur.The energy sector is vital for Indonesia's economy, social well-being, and national security. The national 10-year electricity supply plan (RUPTL 2021–2030) targets 48% renewable sources, including ocean resources, aligning with the national medium-term development plan to promote the blue economy. This study explores the potential of ocean renewable energy in West Java, considering its population density, renewable energy potential, high energy demand, and role as a major electricity supplier to Jakarta. GIS-based methods assess the energy potential of ocean currents, wind, waves, and tides. Energy estimates and economic potential are evaluated based on national electricity tariffs, carbon dioxide reductions, and local economic impacts. The study provides a framework for West Java's regional ocean renewable energy potential, guiding feasibility studies, integration into development and spatial planning, and stakeholder engagement.Mt. Sinabung is classified as a stratovolcano that has been inactive for 400 years. The resting period ended when a new eruption phase occurred between 2010 and 2021. In the span of 2013 to 2021, Mt. Sinabung underwent two significant magmatic eruption which are the first period in 2013 to 2015 and the second within 2016 to 2020. The eruptive activity was identified by a multi-temporal deformation on lava dome generated from LiCSBAS cloud system which corresponds to eruption time. According to the LiCSBAS deformation, Mt. Sinabung erupts when the lava dome deformed exceeding 20 mm. In addition, the eastern to southeastern of Mt. Sinabung flank experienced deflation with deformation rate up to 64 mm/yr. These phenomena agreed with the center of volcanology and geological hazard mitigation (CVGHM) reports that pyroclastic flows and avalanches were frequently emplaced in those regions. Contrary to the hazard sources, the volcanic products were also considered to have great economical values in the perspective of environment such nutrients for the agriculture sector. The spectral angle mapper (SAM) method was also applied to Landsat 8 OLI/TIRS satellite data to map the soil layer condition following the las eruption in 2021. The SAM principle analyzes the resemblance of spectral value
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