1. Supervolcanoes

3. Mt. Saint Helen
Post-1980
Pre-1980

6. YELLOWSTONE Erupted 3 times in about last 2.1 millions years
Last eruption was 640,000 years ago/2500 times MSH

8. Some Supervolcanoes LAKE TOBA, SUMATRA, INDONESIA
LONG VALLEY, CALIFORNIA
LAKE TAUPO, NEW ZEALAND
VALLES CALDERA, NEW MEXICO
AIRA, JAPAN
SIBERIAN TRAPS
YELLOWSTONE

9. LAKE TOBA, SUMATRA, INDONESIA
Last eruption – 74,000 years ago
1,080 square miles/Can erupt 12 times Yellowstone's biggest eruption

10. LONG VALLEY, CALIFORNIA
200 square miles
Erupted 250 mya/ times as much lava as Mt. Saint Helens

11. LAKE TAUPO, NEW ZEALAND 485 square miles
Last eruption – 26,500 years ago/Hundreds of times worse then MSH

12. VALLES CALDERA, NEW MEXICO
175 square miles
Last eruption – 1.2 and 1.6 mya/2000 time MSH

13. AIRA, JAPAN
150 square miles
Erupted 3 times in last 100 years