The foreground hills are part of the Shasta Valley debris avalanche deposit produced by one of the largest known Quaternary volcanic landslides. Roughly 46 km³ of an ancestral Mount Shasta collapsed about 350,000 year ago, producing a massive debris avalanche that swept some 50 km to the north, filling the broad Shasta Valley with hummocky debris.

Photo by Dave Wieprecht, 1995 (U.S. Geological Survey).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Galleries: Debris Avalanches / Landslides

Keywords: debris avalanche deposit | deposit | hummock | stratovolcano

Shasta