Hazard Notification System (HANS) for Volcanoes


U.S. Geological Survey
Tuesday, November 29, 2022, 4:23 PM HST (Wednesday, November 30, 2022, 02:23 UTC)

19°28'30" N 155°36'29" W, Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED

The Northeast Rift Zone eruption of Mauna Loa continues, with several fissures and lava flows active. Several lava flows are traveling in a northeast direction. The longest and largest lava flow is issuing from fissure 3. This lava flow crossed the Mauna Loa Weather Observatory Road at approximately 8 p.m. yesterday evening, November 28, and the flow front was located approximately 4.5 miles (7.5 km) from Saddle Road at approximately 3:30 p.m. HST this afternoon (straight line distance).

This afternoon, fountains at fissure 3 were consistently 40-50 m (131-164 ft) tall and fountains at fissure 4, which formed at approximately 7:30 p.m. HST on November 28, were 5-10 m (16-33 ft) tall.

There is no active lava within Moku'āweoweo caldera, and there is no lava erupting from the Southwest Rift Zone. We do not expect any eruptive activity outside the Northeast Rift Zone. No property is at risk currently. There is a visible gas plume from the erupting fissure fountains and lava flows, with the plume primarily being blown to the North. Sulfur dioxide (SO2) emission rates of approximately 250,000 tonnes per day (t/d) were measured on November 28, 2022.

New webcam views of the Northeast Rift Zone of Mauna Loa are available at the links below: 


Residents with questions about emergency response and resources that may be available to assist those at risk should consult https://hawaii-county-civil-defense-agency-hawaiicountygis.hub.arcgis.com/

Hawai‘i Volcanoes National Park has closed the Mauna Loa Road from Kīpukapuaulu and the closure extends to the summit caldera; for more information please see https://www.nps.gov/havo/index.htm.   

Vog information can be found at https://vog.ivhhn.org/



Next Notice:

HVO Daily Updates on the status of Mauna Loa activity will be posted on the HVO web site at: https://www.usgs.gov/volcanoes/mauna-loa/volcano-updates 

You can receive these updates via email by subscribing to the free Volcano Notification Service at: http://volcanoes.usgs.gov/vns/.

Questions can be emailed to askHVO@usgs.gov

More Information:

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.



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