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Toba Volcano, Indonesia
The 35 x 100 km wide Toba caldera, partially filled by waters of Sumatra's Lake Toba, is Earth's largest Quaternary caldera.
This view looks west toward the northern end of Samosir Island, which is part of a massive inclined block uplifted after eruption of the Young Toba Tuff (YTT) about 74,000 years ago.
The island, once entirely covered by Lake Toba, is formed of caldera-fill deposits of YTT capped by lake sediments.
PHOTO SOURCE: Tom Casadevall 1987, US Geological Survey, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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