Mount Sinabung (Indonesian: Gunung Sinabung, Karo: Deleng Sinabung is a Pleistocene-to-Holocene stratovolcano of andesite and dacite in the Karo plateau of Karo Regency, North Sumatra, Indonesia, from the Lake Toba supervolcano. Many old lava flows are on its flanks and the last known eruption, before recent times, occurred 1200 years before present, between 740 - 880 CE. Solfataric activities (cracks where steam, gas, and lava are emitted) were last observed at the summit in 1912; recent docum…