Characteristics of Active Volcanoes in Sumatra, Indonesia: From Perspective Seismicity, Magma Chemical Composition and Eruption HistoryNanang Sugianto, Mochamad Nukman and Wiwit SuryantoE3S Web Conf., 468 (2023) 09002DOI: https://doi.org/10.1051/e3sconf/202346809002