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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. [15] [16]
Last eruption date Last eruption VEI Location Silverthrone Caldera [note 1] Caldera: 2,865: 9,400: Unknown Franklin Glacier ... Mount Shasta: Stratovolcano: 4,317:
Black Butte (formerly Wintoon Butte, Cone Mountain, Sugar Loaf and Muir's Peak [5]) is a cluster of overlapping dacite lava domes in a butte, [2] a satellite cone of Mount Shasta. [6] It is located directly adjacent to the northbound lanes of Interstate 5 at milepost 742 between the cities of Mount Shasta and Weed, California. The I-5 freeway ...
Highest point; Elevation: 6,896 ft (2,102 m) NGVD 29 [1] Coordinates: 1]: Geography; Location: Lassen and Shasta counties, California, U.S.: Parent range: Cascade Range: Topo map: USGS Prospect Peak: Geology; Mountain type: Extinct Cinder cone: Volcanic arc: Cascade Volcanic Arc: Last eruption: 1666: Climbing; Easiest route: Trail hike: Cinder Cone is a cinder cone volcano in Lassen Volcanic ...
The Long Valley Caldera, which includes Mammoth Lakes area, has been having seismic activity, which can precede a volcanic eruption. Scientists say not to worry. One of California's riskiest ...
The volcanoes with historical eruptions include: Mount Rainier, Glacier Peak, Mount Baker, Mount Hood, Lassen Peak, and Mount Shasta. Renewed volcanic activity in the Cascade Arc, such as the 1980 eruption of Mount St. Helens, has offered a great deal of evidence about the structure of the Cascade Arc. One effect of the 1980 eruption was a ...
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After the 1980 eruption of Mount St. Helens, the United States Geological Survey (USGS) began reassessing the potential risk of other active volcanic areas in the Cascade Range. Further study of Cinder Cone estimated the last eruption occurred between 1630 and 1670. Recent tree-ring analysis has placed the date at 1666.