Primary air-fall tephra deposit (mainly pumice) of the White River Ash. This deposit is 4.8 meters thick and located 20 km north of the vent (Churchill volcano).
Image courtesy of AVO/USGS.
Please cite the photographer and the Alaska Volcano Observatory / U.S. Geological Survey when using this image.
To obtain a high-resolution image, open the full size
page. Then, right click on the image and click
"Save Image As..." or "Save Picture as..."