Hazard Notification System (HANS) for Volcanoes

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HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Friday, January 21, 2022, 8:35 AM HST (Friday, January 21, 2022, 18:35 UTC)


KILAUEA VOLCANO (VNUM #332010)
19°25'16" N 155°17'13" W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary: The summit eruption of Kīlauea Volcano, within Halemaʻumaʻu crater, greatly decreased in output starting yesterday midday to early this morning. After about 4 a.m. HST this morning, the eruption output began to increase. All recent lava activity has been confined to the crater, and there are no indications of activity migrating elsewhere on Kīlauea.

Summit Observations: Summit tiltmeters recorded overall gradual deflation starting January 19, 2022 at about 04:15 p.m. HST, which continued until yesterday evening January 20 at 8 p.m. HST. Inflation began at last night January 20 at 11 p.m. HST and has continued since. Volcanic tremor associated with the eruption—as recorded by nearby seismometers— decreased yesterday until about 8 p.m. HST, and then started increasing since about 5:30 a.m. this morning. The most recent sulfur dioxide (SO2) emission rate of approximately 2100 tonnes per day was measured January 19, 2022.

Halemaʻumaʻu Lava Lake Observations: Lava returned to the western vent within Halemaʻumaʻu crater at about 10:45 a.m. HST on January 18, 2022. The extent of the active lava lake and the overall effusion rate started decreasing yesterday afternoon. The active lava lake was limited to a small pond north of the west vent cone overnight. Just after 4 a.m. HST this morning, the lava effusion rate increased, and by 7 a.m. HST this morning the active lava lake extent has resumed to its previous extent. The lava lake has seen a total rise of about 83 meters (272 feet) since lava emerged on September 29, 2021. Measurements on January 14, 2022 indicated that the total lava volume effused since the beginning of the eruption was approximately 45 million cubic meters (12.0 billion gallons) at that time.

East Rift Zone Observations: No unusual activity has been noted in the Kīlauea East Rift Zone. Low rates of ground deformation and seismicity continue along the East Rift Zone, and along the Southwest Rift Zone. SO2 and hydrogen sulfide (H2S) emissions from Puʻuʻōʻō, in the middle East Rift Zone, were below instrumental detection levels when last measured on January 7, 2021.

Hazard Analysis: This eruption at Kīlauea's summit is occurring within a closed area of Hawaiʻi Volcanoes National Park. Therefore, high levels of volcanic gas are the primary hazard of concern, as this hazard can have far-reaching effects downwind. Large amounts of volcanic gas—primarily water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2)—are continuously released during eruptions of Kīlauea volcano. As SO2 is released from the summit, it reacts in the atmosphere to create the visible haze known as vog (volcanic smog) that has been observed downwind of Kīlauea. Vog creates the potential for airborne health hazards to residents and visitors, damages agricultural crops and other plants, and affects livestock. For more information on gas hazards at the summit of Kīlauea, please see: https://pubs.er.usgs.gov/publication/fs20173017. Vog information can be found at https://vog.ivhhn.org. 

Additional hazards include Pele's hair and other lightweight volcanic glass fragments from lava fountains that will fall downwind and dust the ground within a few hundred meters (yards) of the erupting fissure vent(s). Strong winds may waft lighter particles to greater distances. Residents should minimize exposure to these volcanic particles, which can cause skin and eye irritation. 

Other significant hazards also remain around Kīlauea caldera from Halemaʻumaʻu crater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes within the area closed to the public. This underscores the extremely hazardous nature of the rim surrounding Halemaʻumaʻu crater, an area that has been closed to the public since early 2008. 

For discussion of Kīlauea hazards, please see: https://www.usgs.gov/observatories/hawaiian-volcano-observatory/hazards.

Please see the Hawaiʻi Volcanoes National Park website for visitor information: https://www.nps.gov/havo/index.htm. Visitors to Hawaiʻi Volcanoes National Park should note that under southerly (non-trade) wind conditions, there is potential for a dusting of powdery to gritty ash composed of volcanic glass and rock fragments. These ashfalls represent a minor hazard, but visitors should be aware that such dustings at areas around the Kīlauea summit are possible. 

The Hawaiian Volcano Observatory (HVO) continues to closely monitor Kīlauea volcano.

HVO will continue to issue daily Kīlauea volcano updates until further notice. Additional messages will be issued as needed.


More Information:
Kīlauea activity summary also available by phone: (808) 967-8862
Kīlauea webcam images: https://www.usgs.gov/volcanoes/kilauea/webcams
Kīlauea photos/video: https://www.usgs.gov/volcanoes/kilauea/photo-and-video-chronology
Kīlauea lava-flow maps: https://www.usgs.gov/volcanoes/kilauea/maps
Kīlauea FAQs: https://www.usgs.gov/volcanoes/kilauea/faqs

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

Recent earthquakes in Hawaiʻi (map and list): https://volcanoes.usgs.gov/observatories/hvo/

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

CONTACT INFORMATION:

askHVO@usgs.gov

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.