Hazard Notification System (HANS) for Volcanoes
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, March 9, 2023, 9:51 AM HST (Thursday, March 9, 2023, 19:51 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, remains paused. Lava is no longer flowing on the crater floor, where all recent eruptive activity has been confined. A small ooze-out of lava was observed last night but no active lava is visible at the time of this update. No significant changes have been observed along either of the volcano's rift zones.
Halemaʻumaʻu Lava Lake Observations: A small ooze-out of lava was observed last night just after 6:30 p.m. in the footprint of the western lava lake, within the basin that remained from the end of the 2021–2022 eruption. Ooze-out activity diminished overnight, and no active lava is visible in Halemaʻumaʻu this morning. It is possible that additional ooze-outs may occur. Several hornitos on the crater floor are still glowing in overnight webcam views, but these are not erupting any lava. The recent reduction in activity is related to a large deflationary tilt signal that began on February 17. A live-stream video of the inactive western lava lake area is available at https://www.youtube.com/usgs/live.
Summit Observations: Following a large deflationary tilt signal that began on February 17 and lasted until early February 19, summit tiltmeters have tracked several smaller deflation/inflation (DI) events. Over the course of these DI events there has been a slight increase in net tilt. Inflation from a DI event that began on March 7 reached and slightly exceeded the pre-February 17 level last night. The small ooze-out of lava observed in Halemaʻumaʻu last night may have been associated with this inflationary signal. The rate of inflation decreased overnight and is stabilizing. Volcanic tremor remains slightly elevated but near background level; strong winds across the island yesterday caused a slight increase in overall seismic amplitude measurements recorded by the HVO seismic monitoring network. A sulfur dioxide (SO2) emission rate of approximately 250 tonnes per day (t/d) was measured on February 28.
Rift Zone Observations: No unusual activity has been noted along the East Rift Zone or Southwest Rift Zone; steady rates of ground deformation and seismicity continue along both. Measurements from continuous gas monitoring stations downwind of Puʻuʻōʻō—the 1983–2018 eruptive vent—in the middle East Rift Zone have been below detection limits for SO2, indicating that SO2 emissions from Puʻuʻōʻō are negligible.
Hazard Analysis: Recent eruptions at the summit of Kīlauea Volcano have been occurring within a closed area of Hawaiʻi Volcanoes National Park. 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. 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 the volcano. 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 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.
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
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