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Global Volcanism Program | Image GVP-03187

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.  This wide-angle view is from the west caldera rim with the post-caldera cone of Wizard Island in the foreground. Copyrighted photo by Katia and Maurice Krafft, 1989.

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. This wide-angle view is from the west caldera rim with the post-caldera cone of Wizard Island in the foreground.

Copyrighted photo by Katia and Maurice Krafft, 1989.


Crater Lake