Sanford volcano

Shield volcano 4949 m / 16,237 ft
United States, Eastern Alaska, 62.22°N / -144.13°W
Current status: (probably) extinct (0 out of 5)

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Typical eruption style: unspecified
Sanford volcano eruptions: unknown, no recent eruptions

TimeMag. / DepthDistance/Location
Saturday, October 9, 2021 14:26 GMT (1 earthquake)
Oct 9, 2021 6:26 am (GMT -8) (Oct 9, 2021 14:26 GMT)
1.5
25 km (16 mi)
44 Km E of Silver Springs, Alaska
Thursday, October 7, 2021 08:49 GMT (1 earthquake)
Oct 7, 2021 12:49 am (GMT -8) (Oct 7, 2021 08:49 GMT)
1.8
32 km (20 mi)
38 Km NNE of Kenny Lake, Alaska

Background

Massive dissected Mount Sanford shield volcano is one of the highest Quaternary volcanoes in the United States. The 4949-m-high, glacier-covered andesitic volcano towers above the Copper River and has a broad, bulbous top that is surrounded by massive, glacially excavated cirques, most prominent on the SW and SE sides of the summit. The upper part of this little-studied, ice-covered volcano is possibly of Holocene age (Richter, in Wood and Kienle, 1990) and developed on a base of three coalescing andesitic shield volcanoes south, NW and NNW of the summit that began to form about 900,000 years ago. A massive mid-Pleistocene rhyolitic lava flow from a NE-flank vent traveled more than 18 km to the NE. Basaltic lava flows that were erupted from a NE-flank rift zone about 320,000 years ago mark the latest radiometrically dated activity from Mount Sanford.
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Smithsonian / GVP volcano information


See also: Sentinel hub | Landsat 8
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