Ashfall for 4 major eruptions in the U.S.
By Volcano Hazards Program
2010 (approx.)
![Map of western U.S. with volcanic ashfall outlines.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/volcanic%20ash%20extent.png?itok=Zi6bSKF4)
Detailed Description
Map showing the minimum area covered by volcanic ash from eruptions of Valles Caldera, Mount St. Helens, Yellowstone, and Long Valley Caldera.
Sources/Usage
Public Domain.