Toba Volcano. Landsat image of toba caldera. Toba caldera eruption in 74 ka that spewed 2800 km 3 of pyroclastic materials was the worlds largest supervolcano eruptive product 1000 km 3 eruption in the last 2 million years and is also the youngest resurgent caldera in the world that is still activeat the eruption center it left a giant crater measuring 100 x 30 km with a caldera wall consisting of palaeozoic mesozoic.
Following the eruption the ground collapsed leaving the modern caldera which filled with water to make lake toba. The latest of these produced the young toba tuff ytt about 74000 years ago from vents at the nw and se ends of present day lake toba. Toba caldera eruption in 74 ka that spewed 2800 km 3 of pyroclastic materials was the worlds largest supervolcano eruptive product 1000 km 3 eruption in the last 2 million years and is also the youngest resurgent caldera in the world that is still activeat the eruption center it left a giant crater measuring 100 x 30 km with a caldera wall consisting of palaeozoic mesozoic.
But those eruptionsand pretty much any otherspale in comparison to toba a volcano that erupted on sumatra in indonesia 74000 years ago.
Samosir island is a resurgent volcanic dome a mound of rock uplifted by pressure from un erupted magma in the chamber beneath the volcano. Toba volcano could be one of these and if one of these devastating events is on the way then we need to know about it. The pusukbukit volcano on the western shore of the lake also formed after the. Samosir island is a resurgent volcanic dome a mound of rock uplifted by pressure from un erupted magma in the chamber beneath the volcano.