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Ofu-Olosega

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Ofu-Olosega
green NORMAL, 2024-02-06 02:15:04 UTC

Ofu and Olosega are two islands formed from two shield volcanoes in the United States Territory of American Samoa. Volcanic activity in American Samoa is within the area of responsibility of the U.S. Geological Survey’s Hawaiian Volcano Observatory, based in Hilo on the Island of Hawai‘i.

Facts Block

Location: American Samoa

Latitude: 14.18° S

Longitude: 169.62° W

Elevation: 639 (m) 2,096 (f)

Volcano type: Shield

Composition: Basalt

Most recent eruption: unknown

Nearby towns: Olosega, Ofu

Threat Potential: Low*

*based on the National Volcano Early Warning System

Color photograph of islands from space
NASA Astronaut image of Ofu-Olosega islands (Manu'a Islands, American Samoa) in the South Pacific Ocean. NASA Space Shuttle image ISS002-E-6878 (https://eol.jsc.nasa.gov/SearchPhotos/photo.pl?mission=ISS002&roll=E&fr…).

News

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Photo and Video Chronology – American Samoa – August 2023

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Volcano Watch — USGS Hawaiian Volcano Observatory staff return to American Samoa

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Volcano Watch — Volcanoes of American Samoa

Publications

Volcanic hazards in the Pacific U.S. Territories

The Commonwealth of the Northern Mariana Islands, Guam, and American Samoa lie along the western side of the famed Pacific Ring of Fire. Here, the processes of active island and submarine volcanoes produce activity both underwater and in the atmosphere that poses potential hazards to the daily lives of residents and travelers. Since 2000, CNMI volcanoes have erupted six times, and one submarine vo
Authors
Gabrielle Tepp, Brian Shiro, William W. Chadwick

2018 update to the U.S. Geological Survey national volcanic threat assessment

When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners. This update

Authors
John W. Ewert, Angela K. Diefenbach, David W. Ramsey