Seguam vulcano
Stratovolcanoes 1054 m / 3,458 ft
United States, Aleutian Islands, 52.32°N / -172.51°W
Stato attuale: normal or dormant (1 di 5)
United States, Aleutian Islands, 52.32°N / -172.51°W
Stato attuale: normal or dormant (1 di 5)
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Eruzioni del vulcano Seguam: 1993
Latest nearby earthquakes
| Data / ora | Mag. / Profondità | Distanza | Ubicazione | |
| Thu, 25 Feb 2021 (GMT) (2 Terremoti) | ||||
| 25 feb 2021 11:15 (GMT -10) (25 Feb 2021 21:15:30 GMT) | 2.4 52 km - Più | 79 km | 49 Km ESE of Atka, Alaska, USA | |
| 25 feb 2021 11:15 (GMT -10) (25 Feb 2021 21:15:28 GMT) | 3.0 53 km - Più | 71 km | Bering Sea, 67 km a sud-est da Atka, Aleutians West County, Alaska, Stati Uniti | |
Sfondo
The elliptical, 11.5 x 24 km island of Seguam, lying between Amlia and Amukta Islands in the central Aleutians, contains two calderas with Holocene post-caldera cones. Growth of the basaltic-to-rhyolitic Wilcox volcano on the east side of the island during the late Pleistocene was followed by edifice collapse and an associated ignimbrite eruption about 9000 years ago, leaving a horseshoe-shaped caldera open to the west, inside which a rhyolitic cone was constructed. The 3 x 4 km wide westernmost caldera has a central scoria cone, Pyre Peak, which rises above the caldera rim and is the source of most of the historical eruptions of Seguam volcano. A very young basaltic field surrounds Pyre Peak, and lava flows partially fill the caldera and reach the southern coast. Older Holocene lava flows were erupted from vents within the eastern caldera, and a monogenetic Holocene cone forms Moundhill volcano on the eastern tip of the island.---
Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8
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