Crater Lake Caldera
- Crater
Lake Caldera
-- Geographic Setting, Geologic and Eruptive History
Crater Lake was formed after the collapse of an ancient volcano,
posthumously named Mount Mazama. This volcano violently erupted
approximately 7700 years ago. That eruption was 42 times as powerful
as the 1980 eruption of Mount St. Helens. The basin or caldera was
formed after the top 5000 feet of the volcano collapsed. Subsequent
lava flows sealed the bottom, allowing the caldera to fill with
approximately 4.6 trillion gallons of water from rainfall and snow
melt, to create the seventh deepest lake in the world at 1,932 feet.
-- Excerpt from: U. S. National Park Service
Website: Crater Lake National Park, 1999
- "Pictogram"
- Crater Lake Caldera
-- They say "One Picture is Worth 1,000 Words"
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