USGS

Magmatic Carbon Dioxide Emissions at Mammoth Mountain, California

By Christopher D. Farrar, John M. Neil, and James F. Howle

U.S. GEOLOGICAL SURVEY
Water-Resources Investigations report 98-4217
Sacramento, California 1999

Figure 5

Figure 5. USGS scientist measuring CO2 concentration in the air in a tree well. Wells are pits formed when snow melts away from the trunk. Carbon dioxide can accumulate to dangerous concentrations in such pits, especially if the winds are calm.

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