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A geologist crouches next to a rhyolite outcrop and points to an egg-shaped mass of radiating pink minerals about the size of a cantaloupe. The rest of the rock is pocked with other egg to grapefruit sized pink crystal masses, interspersed with chunky fragments of black glassy lava.
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Large spherulites in Hot Creek rhyolite lava in the Long Valley Caldera
A broad, flat plain covered in dull green sagebrush stretches away from the viewer in this panorama. The photo is being taken from a rocky hill, with snow-capped, sharp peaks on the far side of the plain and low raised hills on the right side of the photo. One geologist is sitting on the rocks at lower right and one geologist is standing and giving a peace sign.
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Panoramic view of the Long Valley Caldera from its north side
Man standing next to rock with hat and high-vis vest. Snow covered mountain in background.
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Phil Dawson at Mount Shasta
In front of an outcrop of matte grey rock splotched with lichens, a young man in an orange safety vest gives a happy thumbs up and an older man sits writing notes in a small notebook and smiles at the camera. The rocks are perched on a moderate slope covered in brushy manzanita and scraggly pine trees.
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CalVO geologists take paleomag samples from a basaltic andesite lava flow on Ash Creek Butte
A digital elevation map of Yellowstone Caldera
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A digital elevation map of Yellowstone Caldera
Mount Konocti as seen from the town of Clear Lake.
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Mount Konocti as seen from the town of Clear Lake.
Thurston Lake and Mount Konocti, Clear Lake Volcanic Field
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Thurston Lake and Mount Konocti, Clear Lake Volcanic Field
A deep blue lake is nestled in pine forest at the foot of a rocky, hilly peak
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Mammoth Mountain
Eddy covariance station at Mammoth Mountain, California
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Eddy covariance station at Mammoth Mountain, California
Rear-arc basalt lava outcrop
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Rear-arc basalt lava outcrop
High-resolution, bare-earth, airborne light detection and ranging (...
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Lidar image of Rocky Ridge and raised shorelines along Lake Tahoe
Brown landscape with volcano in the background
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Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern Ca
Laboratory computers and equipment.
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Argon geochronology lab in Menlo Park, California.
Microprobe and computer in a laboratory.
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Microprobe laboratory in Menlo Park, California.
Medicine Lake, California simplified hazards map showing potential ...
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Medicine Lake, CA simplified hazards map
Hydrotherm example
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Hydrotherm program output example
A simplified geologic map of the Long Valley Caldera, showing post-caldera rhyolite lava flows in various colors, concentrated on the W half of a long ellipsoidal caldera. The topographic caldera margin is shown in part with a dashed line surrounding the lavas and the structural caldera margin (ring fault), shown with a dotted line.
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Long Valley Caldera map
Collecting gases from a hot spring pool near Lassen Peak, California
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Collecting gases from a hot spring pool near Lassen Peak, California
banding of Panum pumice and obsidian
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Flow banding of Panum pumice and obsidian
Drew Downs
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Drew Downs in Iceland
Model of reservoirs underneath Long Valley Caldera...
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Model of reservoirs underneath Long Valley Caldera