1. Crater Lake National Park
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. What’s that? Tectonic shifting?
YES!

5. Tectonic Setting Subduction Three substantial plate shifts
200M years ago
165M 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 Voila! Crater Lake. Cone collapse Crater forms
Material blows out
Crater forms
Magma Oozation
Fills in cracks
H2O fills in crater
Voila! Crater Lake.

10. THE END