Lō‘ihi Seamount

Lō‘ihi - Volcano Updates

Alert Level: UNASSIGNED, Color Code: UNASSIGNED 2021-10-07 21:59:36

U.S. Geological Survey
Thursday, October 7, 2021, 11:59 AM HST (Thursday, October 7, 2021, 21:59 UTC)

18°55'12" N 155°16'12" W, Summit Elevation -3199 ft (-975 m)
Current Volcano Alert Level: UNASSIGNED
Current Aviation Color Code: UNASSIGNED

No significant activity was recorded at Lō‘ihi Volcano during the past month. There were 117 small-magnitude earthquakes detected in the vicinity of the volcano – all less than M2.5. One earthquake of M3.6 was recorded on September 7 about 20 km (12 miles) south of Loihi Seamount.

Background: Intermittent earthquake activity has been recorded in the vicinity of Lō‘ihi since as early as 1952. The most energetic earthquake sequence occurred in July-August 1996, which included more than 4,000 earthquakes, with nearly 300 events larger than M3.0 and 95 events in the M4.0 to 4.9 range. More recently, a swarm of 100 earthquakes occurred on May 11, 2020, with 18 events in the M3.0 to 3.9 range. There are no working monitoring instruments on Lō‘ihi Volcano, whose peak is about 1,000 meters (3,280 feet) below sea level. All real-time information about the volcano is derived from land-based seismometers on the Island of Hawai‘i.

More Information:
Lō‘ihi Seamount website: https://www.usgs.gov/volcanoes/loihi-seamount

Volcanoes at Elevated Alert Levels:
Kīlauea Volcano (ORANGE/WATCH) updates: https://www.usgs.gov/volcanoes/kilauea/volcano-updates
Mauna Loa Volcano (YELLOW/ADVISORY) updates: https://www.usgs.gov/volcanoes/mauna-loa/volcano-updates

This notice contains additional volcanoes not displayed: Hualalai (NORMAL/GREEN), Haleakala (NORMAL/GREEN), Mauna Kea (NORMAL/GREEN).

Subscribe to these messages: https://volcanoes.usgs.gov/vns2/

Summary of volcanic hazards from eruptions: https://www.usgs.gov/observatories/hawaiian-volcano-observatory/hazards

Recent earthquakes in Hawaiʻi (map and list): https://www.usgs.gov/observatories/hawaiian-volcano-observatory/earthquakes

Explanation of Volcano Alert Levels and Aviation Color Codes: https://www.usgs.gov/natural-hazards/volcano-hazards/about-alert-levels



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.