Bogoslof Island
| Bogoslof Island | |
|---|---|
Aerial view, looking south (1994)
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| Highest point | |
| Elevation | 492 ft (150 m) |
| Coordinates | 53°55′38″N 168°02′04″W / 53.92722°N 168.03444°WCoordinates: 53°55′38″N 168°02′04″W / 53.92722°N 168.03444°W |
| Geography | |
 Alaska
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| Location | Aleutian Islands, Alaska |
| Geology | |
| Mountain type | Submarine volcano |
| Volcanic arc | Aleutian Arc |
| Last eruption | Currently active since December 20, 2016. Last eruption on March 7, 2017. |
| Designated | 1967 |
Bogoslof Island or Agasagook Island (Aleut: Aĝasaaĝux̂) is the summit of a submarine stratovolcano located along the southern edge of the Bering Sea, 35 miles (56 km) northwest of Unalaska Island of the Aleutian Island chain. It has a land area of 242 acres (0.98 km2) and is uninhabited by people. The peak elevation of the island is 490 feet (150 m). It is 1,040 metres (3,410 ft) long and 1,512 metres (4,961 ft) wide. The stratovolcano rises about 6,000 feet (1,800 m) from the seabed but the summit is the only part that projects above sea level.
The first known emergence of the island above sea level was recorded during an underwater eruption in 1796. Since then, parts of the island have been successively added and eroded. About 2,000 feet (610 m) north west of Bogoslof a small volcanic dome emerged in 1883 from the same stratovolcano, this has become a stack rock formation known as Fire Island . On the southwest side of Bogoslof another dome erupted in 1796; it is now called Castle Rock. Other eruptions have occurred in 1796-1804, 1806-1823, 1883-1895, 1906, 1907, 1909-1910, 1926-1928, 1992, and 2016-2017. The island is a breeding site for seabirds, seals, and sea lions. An estimated 90,000 tufted puffins, guillemots, red-legged kittiwakes and gulls nest here.
In 1909, President Theodore Roosevelt designated Bogoslof and Fire Island a sanctuary for sea lions and nesting marine birds. Together, as the Bogoslof Wilderness, they are currently part of the Aleutian Islands unit of Alaska Maritime National Wildlife Refuge. In November 1967, Bogoslof Island was designated a National Natural Landmark by the National Park Service. The Bogoslof Island group was added to the National Wilderness Preservation System in 1970.
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