Welcome To

1
Welcome To
Crater Lake National Park Southwest Oregon,
USA Brendan Hunt Evan Halloran
2
Main Points

• Tectonic Setting
• Regional History
• Scale of Eruption

Write em down.
3
Location

• Southwest Oregon
• Located on the Ring of Fire
• Most volcanically active area on Earth
• Located on plate boundary
• Pacific and North American plates

4

• Whats that? Tectonic shifting?

YES!
5

• 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

6
Activity

• 35M 25M years ago
• Relatively dormant for 13M
• Awakes 1M years later
• Around 1M years ago
• Mt. Mazama is formed

7
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

8
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?

9
Crater Lake.IS BORN

• Cone collapse
• Material blows out
• Crater forms
• Magma Oozation
• Fills in cracks
• H2O fills in crater

Voila! Crater Lake.
10
THE END