Alert Level: NORMAL, Color Code: GREEN 2025-03-06 20:15:51 UTC
HAWAIIAN VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Thursday, March 6, 2025, 10:15 AM HST (Thursday, March 6, 2025, 20:15 UTC)
TUTUILA ISLAND (VNUM #244020)
14°17'42" S 170°42' W, Summit Elevation 2142 ft (653 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
No significant activity was detected at Tutuila 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: Tutuila Island is an elongated and eroded group of five Pliocene-to-Pleistocene-aged volcanoes constructed along two or three rifts trending south-southwest to north-northeast. The Leone Volcanics, in the southernmost part of the island, represent the youngest eruption deposits. Eruptions occurred during the Holocene (less than 11,650 years ago) along a 5-kilometer (3-mile) north-to-south trending fissure, forming a group of initially submarine tuff cones and subsequent subaerial cinder cones that produced fresh-looking pāhoehoe lava flows. An ash layer overlying a cultural deposit in the southwestern part of the island was radiocarbon dated at 440 ± 200 CE (Addison et al., 2006). From: https://volcano.si.edu/volcano.cfm?vn=244020
More Information: https://www.usgs.gov/volcanoes/tutuila-island
Additional Resources
This notice contains volcanoes not displayed here: Ofu-Olosega (NORMAL/GREEN), Ta'u 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.
CONTACT INFORMATION:
askHVO@usgs.gov
Subscribe to these messages: https://volcanoes.usgs.gov/vns2/
Summary of volcanic hazards from eruptions: https://www.usgs.gov/observatories/hvo/hazards
Recent earthquakes in Hawaiʻi (map and list): https://www.usgs.gov/observatories/hvo
Explanation of Volcano Alert Levels and Aviation Color Codes: https://www.usgs.gov/programs/VHP/volcanic-alert-levels-characterize-conditions-us-volcanoes
