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USGS Volcano Notice - DOI-USGS-HVO-2022-12-06T10:24:53-08:00

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HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Tuesday, December 6, 2022, 8:32 AM HST (Tuesday, December 6, 2022, 18:32 UTC)


MAUNA LOA (VNUM #332020)
19°28'30" N 155°36'29" W, Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

Activity Summary:

The Northeast Rift Zone eruption of Mauna Loa continues. One active fissure, fissure 3, is feeding a lava flow advancing slowly northward toward the Daniel K. Inouye Highway (Saddle Road). The lava flow has reached relatively flat ground causing it to slow down significantly over the past several days, as expected.    

As of 5:00 a.m. today, December 6, the flow front was about 1.93 mi (3.1 km) from the Daniel K. Inouye Highway (Saddle Road). There continued to be several small overflows from main channels recorded over the past day and a brief surge at the flow front yesterday morning. During the past 24 hours, the lava flow advanced at an average rate of about 68 feet per hour (21 meters per hour), about twice the rate for the past several days. Over shorter periods, the advance rate varied from 62 to 90 feet per hour (18.8 to 27.4 m per hour). The lava flow remains active and is continuously supplied from the fissure 3 vent.    

Advance rates may be highly variable over the coming days and weeks. On the flat ground between Mauna Loa and Mauna Kea, lava flows advance more slowly, spread out, and inflate. Individual lobes may advance quickly, and then stall. Additional breakouts may occur if lava channels get blocked upslope. There are many variables at play and both the direction and timing of flow advances are expected to change over periods of hours to days, making it difficult to estimate when or if the flow will impact Daniel K. Inouye Highway.  

Sulfur dioxide (SO2) emission rates of approximately 120,000 tonnes per day (t/d) were measured on December 4, 2022, and remain elevated at this time. The International Volcanic Health Hazard Network has detailed information about vog: https://vog.ivhhn.org/. Forecasts for the dispersion of vog can be found on the Mauna Loa Vog Forecasting Dashboard: https://vog.ivhhn.org/content/mauna-loa-eruption 

Pele's hair (strands of volcanic glass) fragments are being wafted great distances and have been reported as far Laupāhoehoe.  

Tremor (a signal associated with subsurface fluid movement) continues beneath the currently active fissures. This indicates that magma is still being supplied to the fissure, and activity is likely to continue as long as we see this signal. 

There is no active lava within Moku'āweoweo caldera nor the Southwest Rift Zone. We do not expect any eruptive activity outside the Northeast Rift Zone.  

Most recent eruption map:  https://www.usgs.gov/maps/december-5-2022-mauna-loa-eruption-map    

New webcam: [M7cam] Live Image of Mauna Loa's Northeast Flank from Mauna Kea; view is to the south [M7cam]. See https://www.usgs.gov/observatories/hvo/m7cam-mauna-loa-northeast-flank  

 

 

 



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.   

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:

Volcanic Hazards: 

Air quality/volcanic gas plume (fissure eruption): High levels of volcanic gas, including sulfur dioxide (SO2) , are emitted from the fissure vents. As SO2 is released from the eruption, it will react in the atmosphere with oxygen, sunlight, moisture, and other gases and particles and within hours to days, convert to fine particles. The particles scatter sunlight and cause the visible haze, known as vog (volcanic air pollution, from “volcanic smog”). Vog creates the potential for airborne health hazards to residents and visitors, damages agricultural crops and other plants, and affects livestock operations.  

Lava flows: Hawaiian lava flows generally advance slowly enough that people can avoid them. They can destroy everything in their paths, including vegetation and infrastructure—which can cut off road access and utilities. Hazards associated with active or recent lava flows include hot and glassy (sharp) surfaces that can cause severe burns, abrasions, and lacerations upon contact with unprotected or exposed skin; uneven and rough terrain can lead to falls and other injuries; hot temperatures that can cause heat exhaustion or dehydration, or in heavy rain can produce steamy ground-fog that can be acidic, severely limiting visibility and sometimes causing difficulty breathing.   

Tephra fall:  Pele's hair and other lightweight volcanic glass fragments from lava fountains and spattering will fall downwind, dusting the ground within a few hundred meters (yards) of the vent. High winds may waft lighter particles and transport them greater distances downwind. Residents are urged to minimize exposure to these volcanic particles, which can cause skin and eye irritation similar to volcanic ash.  

Secondary hazards: Lava flow advance into vegetated areas may generate secondary hazards by igniting small fires in vegetation adjacent to lava flow margins. Lava flows that cover and burn vegetation and soil also introduce the hazard of subsurface natural gas pockets igniting, which can cause methane explosions. These explosions can blast lava fragments up to several meters (yards) away and can be hazardous to observers.  



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
 



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