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The lake is actually situated in a double caldera, as a smaller eruption caused another caldera under the lake to collapse about 5,400 years ago.
The volcano’s eruptions stretch well into recorded history, and the last known eruption was about 1000 years ago, causing devastating ash and pyroclastic flows to retard crops, and lower the temperature considerably bringing with it a very cold winter and harsh famine.
Source: https://goo.gl/RTtidI
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