Ofu-Olosega
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Ofu-Olosega
green NORMAL, 2025-05-01 21:37:56 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
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
Hawaiian Volcano Observatory (HVO)
Hawaiian Volcano Observatory (HVO)
The USGS Hawaiian Volcano Observatory monitors volcanoes in American Samoa
Media
Sources/Usage: Public Domain. View Media Details
News
Photo and Video Chronology – American Samoa – August 2023
Photo and Video Chronology – American Samoa – August 2023
Volcano Watch — USGS Hawaiian Volcano Observatory staff return to American Samoa
Volcano Watch — USGS Hawaiian Volcano Observatory staff return to American Samoa
Volcano Watch — Volcanoes of American Samoa
Volcano Watch — Volcanoes of American Samoa
Publications
Volcanoes of American Samoa
Upu Amata (Introduction)O le Atu-Samoa o le tasi lenei o faʻasologa motu mauga mu i le Vasa Pasefika i Saute. O motu e pito i sasaʻe o nei faʻasologa mauga mu o le Atu-Samoa, o motu ia o Amerika Samoa. E tofu lava mauga mu taʻitasi o Amerika Samoa ma ona talaaga aemaise tulaga e tutupu e ono pa ai i le lumanai. O loʻo galulue faʻatasi le Ofisa o le U.S. Geological Survey (USGS) ma le...
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...
By
Volcano Hazards Program, Volcano Science Center, Agrigan, Ahyi Seamount, Alamagan, Anatahan, Asuncion, Daikoku Seamount , East Diamante, Esmeralda Bank, Farallon de Pajaros, Fukujin Seamount , Guguan, Kasuga 2, Maug Islands, Ofu-Olosega, Pagan, Ruby, Sarigan, South Sarigan Seamount, Supply Reef, Ta'u Island, Tutuila Island, Zealandia Bank, Subduction Zone Science
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...
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