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A deep blue lake is nestled in pine forest at the foot of a rocky, hilly peak
August 4, 2019

Mammoth Mountain

View of the Mammoth Mountain lava dome complex overlooking Horseshoe Lake.

Model of reservoirs underneath Long Valley Caldera...
August 8, 2016

Model of reservoirs underneath Long Valley Caldera

Main hydrothermal features of the new (2016) 3-D model of the subsurface at Long Valley Caldera. This schematic is based on a survey of the electrical properties of the earth (magnetotellurics) below. Arrows show subsurface water flow, with colors keyed to changing water temperature, from blue (cold) to red (hot). Purple arrows show an extinct hot water pathway. See 2016

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Volcanic-gas "sniffer" installed at Mammoth Mountain, California me...
July 16, 2014

Volcanic-gas "sniffer" installed at Mammoth Mountain, CA measures t...

Volcanic-gas "sniffer" installed at Mammoth Mountain, California measures temperature plus carbon dioxide and other gas concentration from a steaming vent.

Carbon dioxide gas detection instrument installed at Horseshoe Lake...
June 25, 2013

Carbon dioxide gas detection Horseshoe Lake, Mammoth Mountain, CA.

Carbon dioxide gas detection instrument installed at Horseshoe Lake, Mammoth Mountain, California.

Map shows hazard zone for pyroclastic flows and surges around poten...
December 31, 2012

Map shows hazard zone for pyroclastic flows and surges around poten...

Map shows hazard zone for pyroclastic flows and surges around potential vents in the Mammoth Mountain area of the Long Valley Caldera.

Map shows the potential thickness of tephra on the ground from futu...
December 31, 2012

Map shows the potential thickness of tephra on the ground from futu...

Map shows the potential thickness of tephra on the ground from future eruptions in the Long Valley area.

Trees killed by diffuse CO2 emissions in the Reds Creek drainage on...
September 6, 2006

Trees killed by diffuse CO2 emissions in the Reds Creek drainage on...

Trees killed by diffuse CO2 emissions in the Reds Creek drainage on the west side of Mammoth Mountain.

Inyo Craters volcanic chain, California
December 31, 2001

Inyo Craters volcanic chain, California

The Alignment of the Inyo Craters volcanic chain, California, is marked by Wilson Butte lava dome and Obsidian Flow in the distance on the left. Mammoth Mountain is seen on the skyline.

Shaded areas indicate where tephra layers remain from associated ve...
December 31, 2000

Shaded areas indicate where tephra layers remain from associated ve...

Shaded areas indicate where tephra layers remain from associated very large eruptions. At the time of eruption, lighter ash fall extended to greater distances than shown here.