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Volcano Updates

The USGS Hawaiian Volcano Observatory issues Volcano Updates for Ofu-Olosega as activity warrants.

Alert Level: NORMAL, Color Code: GREEN 2024-07-04 16:47:03 UTC

U.S. Geological Survey
Thursday, July 4, 2024, 6:47 AM HST (Thursday, July 4, 2024, 16:47 UTC)

14°10'30" S 169°37'5" W, Summit Elevation 2096 ft (639 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

No significant activity was detected at Ofu-Olosega Volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano.

Background: The islands of Ofu and Olosega in Manuʻa Islands of eastern American Samoa, with a combined length of 6 kilometers (3.7 miles), 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. The Nuʻutele tuff cone, forming a small crescent-shaped island immediately off the west end of Ofu, is of Holocene age (less than 11,650 years). A submarine eruption occurred in 1866, 3 kilometers (1.9 miles) southeast of Olosega, along the Samoan Ridge between Olosega and Taʻu Island. From:

More Information:

This notice contains volcanoes not displayed here: Ta'u Island (NORMAL/GREEN), Tutuila Island (NORMAL/GREEN).

The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawaiʻi and American Samoa.


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