Volcano Hazards Program Office

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Image: Katmai National Park and Preserve, Alaska
August 13, 1912

Katmai National Park and Preserve, Alaska

Volcanic ash drifts around houses at Katmai after the June 1912 eruption of Novarupta Volcano. Church in the distant background. August 13, 1912.

Glacier Peak, Washington simplified hazards map
December 31, 1905

Glacier Peak, WA simplified hazards map

Glacier Peak, Washington simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Three Sisters, Oregon simplified hazards map showing potential impa...
December 31, 1905

Three Sisters, OR simplified hazards map

Three Sisters, Oregon simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Mount Konocti viewed from Cinder Cone, Clear Lake Volcanic Field.
December 31, 1905

Mount Konocti viewed from Cinder Cone, Clear Lake Volcanic Field.

Mount Konocti, the most distinct volcanic feature of the Clear Lake Volcanics as viewed to the west from Cinder Cone.

Painting by Henry Wood Elliott (1846-1930), Yellowstone Lake, 1871, watercolor.
December 31, 1871

Painting by Henry Wood Elliott (1846-1930), Yellowstone Lake, 1871

Painting by Henry Wood Elliott (1846-1930), Yellowstone Lake, 1871, watercolor (Phoenix Art Museum).  The view is from northern Yellowstone Lake looking to the south.  In the foreground, one can see the Annie in the northern lake and the three largest of the lake’s islands: Stevenson Island, with Frank Island and the smaller Dot Island behind.  Flat

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Henry Elliott’s 1871 map of Yellowstone Lake
December 31, 1871

Henry Elliott’s 1871 map of Yellowstone Lake

Henry Elliott’s 1871 map of Yellowstone Lake (https://hdylake.org/about/history-of-mapping-yellowstone-lake/). The headwaters of the Snake River, Upper Valley of the Yellowstone River, and Pelican River are shown. The area now known as West Thumb is referred to as the South West Arm on the map.

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Henry Wood Elliott during a geological expedition in 1870
December 31, 1870

Henry Wood Elliott during a geological expedition in 1870

Henry Wood Elliott during a geological expedition in 1870.  Photo by William Henry Jackson.

Silica sinter (an amorphous form of silicon dioxide) forms from the...

Silica sinter (an amorphous form of silicon dioxide) forms from the...

Silica sinter (an amorphous form of silicon dioxide) forms from the waters that flow from hot springs near Shoshone Lake, Yellowstone National Park. USGS photograph by Jake Lowenstern.

Mount Adams viewed from the southeast in Klickitat Valley, Washingt...

Mount Adams viewed from SE in Klickitat Valley, WA.

Mount Adams viewed from the southeast in Klickitat Valley, Washington.

Geologists examining ash layers associated with the Dusty assemblag...

Geologists examining ash layers associated with the Dusty assemblag...

The orange layer just below geologist's hiking pole is the Mazama ash (about 7700 ybp). Below that are glacial deposits. Above the Mazama is about a meter consisting mostly of fine-grained tephras from Glacier Peak, capped by soil and plants. That the tephras sit directly on top of the Mazama indicates that "Dusty" eruptions commenced about 7,000 years ago. The fine grain

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