File:Mount Shasta (15356083710).jpg

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Mount Shasta — Mount Shasta is located in the Cascade Range in northern California about 65 km (40 mi) south of the Oregon-California border. One of the largest and highest (14,162 ft) of the Cascade volcanoes, the compound stratovolcano is located near the southern end of the range that terminates near Lassen Peak. The last known eruption occurred about 200 radiocarbon years ago, and may have occurred in 1786.

The next eruption at Mount Shasta would likely involve weeks to months of precursory earthquakes and ground deformation followed by a series of steam explosions blasting a deep crater at the summit of the volcano. Steam explosions would be followed by slow extrusion and accumulation of partially molten rock in the crater, leading to the formation of a steep-sided lava dome. Periodic collapse of the growing dome would generate explosions with vertical ash columns up to 8 km (5 mi) high. Fast moving avalanches (pyroclastic flows) of hot dome rock racing down the flanks of the volcano would melt ice and snow creating mudflows (lahars) capable of flooding drainages many kilometers away.

Learn more about Mount Shasta: on.doi.gov/MountShasta

In this photo: Mount Shasta and Shastina (background) with Sheep Rock (foreground). Debris avalanche hummocks can be seen to the right. Credit: Mark Stensaas
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Source Mount Shasta
Author U.S. Geological Survey from Reston, VA, USA

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by U.S. Geological Survey at https://flickr.com/photos/27784370@N05/15356083710 (archive). It was reviewed on 19 January 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

19 January 2018

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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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current21:24, 19 January 2018Thumbnail for version as of 21:24, 19 January 2018864 × 576 (327 KB)Artix Kreiger 2 (talk | contribs)Transferred from Flickr via Flickr2Commons

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