Images

Whitney Creek on the slopes of Mount Shasta in northern California is regularly reshaped by debris flows, created by melting snow and ice or precipitation. Although the stream channel itself is relatively small, these flows are capable of carrying large volumes of volcanic debris, including boulders in excess of several meters. USGS photo by J. Ball.

Lenticular clouds form when moist air flows up the slopes of a volcano (or other peak), cools, and condenses. The resulting clouds often drop a bit after pushing over the summit, like an eddy over a rock in a stream, and create seemingly stationary shapes that hover over the landscape. USGS photo by Andrew Calvert.

Phil Dawson, a Volcano Seismologist with the California Volcano Observatory, stands next to a volcanic rock on the flank of Mount Shasta, California.

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.

The photo was taken from a vantage looking up Avalanche Gulch at Red Banks (a line of cliffs along the ridge central to the photograph).

Plot of earthquakes in Mount Shasta region greater than M1.0 from April 3, 2010 to April 3, 2015.

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

Lidar images of Shastina cone, west flank of Mount Shasta, California. Details of lava flows and other surficial features are best seen in the image to the right with vegetation removed.

Map showing one-year probability of accumulation of 1 centimeter (0.4 inch) or more of tephra from eruptions of volcanoes in the Cascade Range.

Eruptions in the Cascade Range during the past 4000 years. USGS GIP 64

Aerial photo of Mount Shasta's southwestern flank in a low-snow period. The Hotlum cone is on the right, while the Shastina dome is to the left.

Horse-drawn carriage on road in Sisson, California, El Monte Hotel in foreground, Mount Shasta in the background. Image courtesy of the Library of Congress.

Photograph of the town of Sisson (later (1922) the town of Mt. Shasta) in the distance at the foot of Mount Shasta in winter. Snow covered fir trees in the foreground. Photo courtesy of University of Southern California Libraries and California Historical Society. Digitally reproduced by the USC Digital Library.