Bobrof
Stratovulcano · United States · 738 m
- Tipo
- Stratovulcano
- Paese
- United States
- Regione
- Nord America / Aleutian Ridge Volcanic Arc
- Altitudine
- 738 m
- Coordinate
- 51.910, -177.438
- Ultima eruzione
- Sconosciuto
- Contesto tettonico
- Subduction zone / Intermediate crust (15-25 km)
- Forma vulcanica
- Composite
- Roccia principale
- Basalt / Picro-Basalt
Sintesi geologica
The geology and timing of volcanism on this small uninhabited 3 x 4 km island, located in the Andreanof islands 50 km west of Adak and 15 km west of Kanaga volcano, are unknown (Coats, 1956). Apparent deposits of a massive submarine debris-avalanche deposit extend offshore to the NE. Smith et al. (1978) considered Bobrof to be of possible Holocene age. Andesitic pyroclastic-flow deposits are present on the 738-m-high volcano.
Sintesi da Wikipedia
Riassunto in ingleseBobrof Island is one of the Andreanof Islands subgroup of the Aleutian Islands in southwestern Alaska, United States. Bobrof Island is a small, uninhabited island about 9 miles (14 km) north and west of Kanaga Island, and 7 miles (11 km) northeast of Cape Sudak on Tanaga Island. Bobrof Island is 2.6 miles (4.2 km) long and 1.8 miles (2.9 km) wide with an area of 3 square miles (7.8 km2), and consists primarily of the 2,421-foot (738 m) high Bobrof Volcano. The volcanic crater, or cone, has been heavily dissected. Underwater deposits adjacent to the island's northeast flank suggest an immense debris-avalanche has taken place.
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