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Ofu-Olosega volcano

Shield volcanoes 639 m / 2,096 ft
United States, Samoan Islands, -14.18°S / -169.62°W
Current status: dormant (1 out of 5) | Reports
Ofu-Olosega volcano books
Typical eruption style: unspecified
Ofu-Olosega volcano eruptions: 1866 No recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

The two triangle-shaped islands of Ofu and Olosega in eastern Samoa, with a combined length of 6 km, are separated by a narrow strait. The islands are formed by two eroded, coalescing basaltic shield volcanoes whose slopes dip to the east and west. Steep cliffs up to 600-m high truncate the northern and southern sides of the islands. The narrow, steep-sided ridge forming the eastern tip of Ofu Island consists of a dike complex. The shield volcano on Ofu is cut on the north by the A'ofa caldera; bathymetry suggests that a caldera may also exist on the Sili shield volcano of Olosega. The Nu'utele tuff cone, forming a small crescent-shaped island immediately off the west end of Ofu Island, is Holocene in age. A submarine eruption took place in 1866 at the opposite end of the two islands, 3 km SE of Olosega, along the ridge connecting Olosega with Ta'u Island.
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Smithsonian / GVP volcano information

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