Eruption History of Mount Shasta | U.S. Geological Survey - USGS.gov
Nov 5, 2023 · Mount Shasta erupts episodically with ten or more eruptions occurring in short (500-2,000 year) time periods separated by long intervals (3,000-5,000 years) with few or no eruptions. Evidence suggests that magma most recently erupted at the surface about 3,200 years ago.
Mount Shasta - Wikipedia
A historic eruption of Mount Shasta in 1786 may have been observed by Lapérouse, but this is disputed. Smithsonian Institution 's Global Volcanism Program says that the 1786 eruption is discredited, and that the last known eruption of Mount Shasta was around 1250 AD, proved by uncorrected radiocarbon dating.
Hazards Summary for Mount Shasta | U.S. Geological Survey - USGS.gov
Mount Shasta has erupted, on the average, at least once per 800 years during the last 10,000 years, and about once per 600 years during the last 4,500 years. The last known eruption occurred about 200 radiocarbon years ago.
Mount Shasta | U.S. Geological Survey - USGS.gov
Eruptions at about 11,000 years ago built Black Butte and Shastina on the western flanks of Mount Shasta. In the last few millennia, smaller eruptions have broken out at the volcano’s summit and from vents on its upper east flank. The youngest dated eruption occurred about 3,200 years ago, producing block and ash flows on the volcano's north ...
California’s Mount Shasta Loses a Historical Eruption
Aug 20, 2019 · Mount Shasta is not the only volcano to lose a big bang. By combing through ships’ logs, old research papers and travel diaries, Venzke and his colleagues have debunked and discredited 166...
Mount Shasta Volcano - VolcanoDiscovery
Jan 11, 2025 · About 200 years ago the last significant Mount Shasta eruption came from this cone and created a pyroclastic flow, a hot lahar (mudflow), and three cold lahars, which streamed 7.5 miles (12.1 km) down Mount Shasta's east flank via Ash Creek.
The remarkable volcanism of Shastina, a stratocone segment of Mount …
Aug 10, 2020 · Mount Shasta, a 400 km 3 volcano in northern California (United States), is the most voluminous stratocone of the Cascade arc. Most Mount Shasta lavas vented at or near the present summit; relatively smaller volumes erupted from scattered vents on the volcano’s flanks.
Shasta - Global Volcanism Program
An aerial view shows the Military Pass lava flow on NE side of Mount Shasta, the longest known lava flow from the volcano, erupted about 9,200 years ago. It originated near the summit of the Hotlum cone and reached about 9 km, with a thickness of about 150 m thick near its terminus.
Could Mount Shasta Bring America's Next Great Volcanic Eruption ...
Oct 10, 2024 · The USGS recognizes that Shasta isn’t a very active volcano (it’s considered dormant but not extinct), with the populated areas surrounding the mountain make it so high-risk. In its report of the most dangerous volcanoes in America, they outline how an eruption could bring devastation to nearby towns:
Could Mt. Shasta be the next St. Helens? - Record Searchlight
Jan 17, 2020 · Shasta is the second most southern peak in the range and is considered dormant but not extinct. For a long time, 1786 was assumed to be the last time Mt. Shasta erupted. But in a new report,...