Hazard Notification System (HANS) for Volcanoes
USGS Volcano Notice - DOI-USGS-HVO-2023-11-28T10:43:58-08:00
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Tuesday, November 28, 2023, 8:46 AM HST (Tuesday, November 28, 2023, 18:46 UTC)
KILAUEA (VNUM #332010)
19°25'16" N 155°17'13" W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Activity Summary: Kīlauea volcano is not erupting. Low levels of seismicity continue in the Southwest Rift Zone, summit, and upper East Rift Zone. Unrest may continue to wax and wane with changes to the input of magma into the area and eruptive activity could occur in the near future with little or no warning. No unusual activity has been noted along the middle and lower sections of Kīlauea’s East Rift Zone.
Summit Observations: Summit seismicity over the past 24 hours has been at low levels with 9 events over the past 24 hours.
The Uēkahuna summit tiltmeter, located northwest of the caldera, shows a small deflation of 1 microrad followed by inflation of 0.6 microrads over the past 24 hours. The Sand Hill tiltmeter, located southwest of the caldera, shows a similar pattern to that of UWE over the past 24 hours. Overall, the summit of Kīlauea remains at a high level of inflation, above the level reached prior to the most recent eruption in September 2023, and the highest level since the 2018 eruption.
Sulfur dioxide (SO2) emission rates remain low. Field observations found SO2 gas emmision of 100 tonnes per day on November 17. This is the same as an observation in October 2023.
There is currently no sign of an imminent eruption, and seismic activity continues at low levels at the summit, upper East Rift Zone, and Southwest Rift Zone. An increase in seismic unrest would be expected prior to any eruptive activity in this region. The onsets of previous summit eruptions have been marked by strong swarms of earthquakes caused by the emplacement of a dike 1-2 hours before eruptions and these have not been detected at this time.
The HVO information statement released on October 23, 2023, provides additional information and context related to recent unrest at Kīlauea summit: https://volcanoes.usgs.gov/hans2/view/notice/DOI-USGS-HVO-2023-10-23T22:33:18-07:00
A map summarizing recent unrest southwest of Kilauea’s summit (activity beginning 10/4/23) is seen here: https://www.usgs.gov/maps/november-5-2023-summary-map-intrusive-activity-kilauea-volcano
Rift Zone Observations: Seismicity in the upper East Rift Zone continues at low levels with 13 events over the past 24 hours, and 24 events over the past 24 hours in the Southwest Rift Zone.
We continue to closely monitor both rift zones, especially near the summit. No unusual activity has been noted along the middle and lower East Rift Zones. Measurements from continuous gas monitoring stations downwind of Puʻuʻōʻō in the middle East Rift Zone have been below detection limits for SO2, indicating that SO2 emissions from Puʻuʻōʻō are negligible.
Hazard Analysis: Levels of volcanic gas (sulfur dioxide and carbon dioxide) can remain locally hazardous even though Kīlauea is no longer erupting. Sulfur dioxide (SO2) gas emissions have greatly decreased; however, local concentrations of sulfur dioxide (SO2) or hydrogen sulfide (H2S) may persist in downwind areas, and residents may notice odors of these gases occasionally. Significant hazards also remain around Halemaʻumaʻu from crater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes within the area closed to the public. For discussion of Kīlauea hazards, please see: https://www.usgs.gov/observatories/hawaiian-volcano-observatory/hazards.
The Hawaiian Volcano Observatory (HVO) continues to closely monitor Kīlauea volcano.
Next Notice: HVO will issue daily Kīlauea updates. Additional messages will be issued as needed.
- Hawaiʻi Volcanoes National Park visitor information: https://www.nps.gov/havo/index.htm
- 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
- Kīlauea hazards discussion: https://www.usgs.gov/observatories/hawaiian-volcano-observatory/hazards
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.
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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