Global Volcanism Program | Image GVP-03301

In 1995 soil gas fluctuations caused tree dieback at Horseshoe Lake on the SE side of Mammoth Mountain. A period of unrest including uplift and seismic swarms has continued for more than a decade. Photo by Dave Wieprecht, 1995 (U.S. Geological Survey).

In 1995 soil gas fluctuations caused tree dieback at Horseshoe Lake on the SE side of Mammoth Mountain. A period of unrest including uplift and seismic swarms has continued for more than a decade.

Photo by Dave Wieprecht, 1995 (U.S. Geological Survey).

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Mammoth Mountain