California Volcano Observatory

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Thurston Lake and Mount Konocti, Clear Lake Volcanic Field
December 16, 2019

Thurston Lake and Mount Konocti, Clear Lake Volcanic Field

Thurston Lake and Mount Konocti, Clear Lake Volcanic Field, California.

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.

Rear-arc basalt lava outcrop
April 2, 2019

Rear-arc basalt lava outcrop

A 3-4m (10-12 ft) high outcrop of basalt lava, part of a broader lava flow. These flows were erupted about 300,000 years ago following basalt dike intrusions in a rear-arc region of northern California. The eruptions of three of these flows are thought to have taken place within several hundred years of each other.

High-resolution, bare-earth, airborne light detection and ranging (...
December 31, 2018

Lidar image of Rocky Ridge and raised shorelines along Lake Tahoe

High-resolution, bare-earth, airborne light detection and ranging (LiDAR) image, looking obliquely northwest into Rocky Ridge. Image units correspond to those of Figure 2: MPa—Miocene-Pliocene andesite lavas and breccias; QPs—Pliocene-Pleistocene lacustrine sediments, locally diatomite-rich; Qb1—older basalt lavas (2.3 Ma); Qtf—0.94 Ma trachyandesite lavas; Qu—

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Brown landscape with volcano in the background
December 31, 2018

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern Ca

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern California, looms above Little Glass Mountain, a thick obsidian flow erupted from the Medicine Lake shield volcano about 1,000 years ago. These are just two of the young volcanic areas monitored by the USGS California Volcano Observatory. USGS photo.

Laboratory computers and equipment.
September 25, 2018

Argon geochronology lab in Menlo Park, California.

Argon geochronology lab in Menlo Park, California.

Microscope and computer in a laboratory.
September 25, 2018

Scanning Electron Microscopy lab, Menlo Park California.

Scanning Electron Microscopy lab, Menlo Park California.

Microprobe and computer in a laboratory.
September 25, 2018

Microprobe laboratory in Menlo Park, California.

Microprobe laboratory in Menlo Park, California.

Medicine Lake, California simplified hazards map showing potential ...
December 31, 2017

Medicine Lake, CA simplified hazards map

Medicine Lake, California simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

banding of Panum pumice and obsidian
December 31, 2016

Flow banding of Panum pumice and obsidian

Flow banding of Panum pumice and obsidian of the same composition.

Drew Downs
August 20, 2016

Drew Downs in Iceland

Drew Downs in Iceland with a glacier in hte background.