Transcript Crater Lake

Welcome To…
Crater Lake National Park
Southwest Oregon, USA
Brendan Hunt
Evan Halloran
Main Points
• Tectonic Setting
• Regional History
• Scale of Eruption
Write ‘em down.
Location
• Southwest Oregon
• Located on the Ring of Fire
– Most volcanically active area on Earth
• Located on plate boundary
– Pacific and North American plates
What’s that? Tectonic
shifting?
YES!
Tectonic Setting
• Subduction
• Three substantial plate shifts
– 200M years ago
– 165M years ago
– 35M years ago
• 35M years ago
– Shift occurred out at sea
– Parallel to previous shift
– Resulting chain of volcanoes blew pyroclastic material
east - aiding in the buildup of sediments
Activity
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35M – 25M years ago
Relatively dormant for 13M
Awakes 1M years later
Around 1M years ago
Mt. Mazama is formed
Mt. Mazama
• Began to form around 1 million years ago!
– Young in comparison to area
• 12,000 ft. above sea level
• 10,000 ft. after glacial retreat
Eruption
• 8,000 years ago
• Massive
• Mount St. Helens 1980 eruption = weak
– Mt. Mazama eruption was 42 times stronger
• Blew off around 2,000 ft. of the summit
• Ash carried hundreds of miles
– Into Canada, eh?
Crater Lake….IS BORN
• Cone collapse
– Material blows out
• Crater forms
• Magma Oozation
– Fills in cracks
• H2O fills in crater
Voila! Crater Lake.
THE END