1. Long Valley Caldera and Mammoth Lakes Field Geology Class – Earth Science 35
Summer 2008

3. 2 Types of Volcanoes – in general…

4. Shield vs. Strato/Composite Size Relationships

5. Types of Volcanoes – more specific…

6. Types of Volcanoes – more details…

7. Earthquakes in the Mammoth Lakes Area

8. CO2 Gas Emissions in the Mammoth Lakes Area

9. Prehistoric Volcanic Eruptions in the Long Valley Area

10. Volcanic Rocks in the Region

11. Earthquakes and Uplift at Long Valley

12. Mt. St. Helens Resurgent Dome in 1984

13. Pyroclastic Flows from Mt. St. Helens in 1980

14. Pumice from Pyroclastic Flows from Mt. St. Helens in 1980

15. Model of a Probable Volcanic Event

16. Geothermal Energy Production

17. United States Pumice Company Products

18. Conclusions
The area is popular among tourists from L.A. & San Diego
Many volcanoes have been mapped in the vicinity
Long Valley supervolcano erupted 760,000 years ago
Mammoth Lakes has been seismically active since 1980
The area is geothermally active with hot springs, CO2 gas
Most likely is a smaller, Mt. St. Helens type eruption
USGS’s Long Valley Observatory (LVO) works with local communities, businesses, government to monitor and warn citizens in the area of potential volcanic hazards