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Crater Lake, Oregon, USA
The spectacular 8 x 10 km wide Crater Lake caldera was formed about 6850 years ago when Mount Mazama, a complex of overlapping shield volcanoes and stratovolcanoes, collapsed following a major explosive eruption.
The eruption blanketed a huge area with ash falls and produced pyroclastic flows that swept all sides of the volcano.
The caldera, seen here from its southern rim, is 1200 m deep and filled to half its depth by the intensely blue waters of Crater Lake.
PHOTO SOURCE: Dave Wieprecht 1995 US Geological Survey, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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