USGS Volcanoes: Notices released in the last day.

Minor seismicity were detected over the past day. Clouds obscured views of the active lava dome in satellite and webcam imagery. 

The current eruption began in July 2021 and, since then, lava flows have filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data, webcams, and regional infrasound and lightning networks.

Low-level unrest continues with seismicity at low-levels. Mostly clear satellite imagery shows a small sulfur dioxide plume to the north of Kupreanof.

There is no real-time geophysical monitoring network at Mount Kupreanof. The closest functioning seismometers are approximately 17 miles (27 km) to the east of the volcano as part of the Mount Veniaminof network. Mount Kupreanof is also monitored by satellite data, remote infrasound and lightning networks, and visual observations from pilots and mariners passing by the volcano. 

Minor seismic and infrasound activity signals were detected at the volcano. The typical degassing plume from the summit crater with sulfur dioxide and steam emissions observed in mostly clear satellite and web camera views.

Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions. 

Minor seismicity were detected over the past day. Clouds obscured views of the active lava dome in satellite and webcam imagery. 

The current eruption began in July 2021 and, since then, lava flows have filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data, webcams, and regional infrasound and lightning networks.

Low-level unrest continues with seismicity at low-levels. Mostly clear satellite imagery shows no unusual activity.

There is no real-time geophysical monitoring network at Mount Kupreanof. The closest functioning seismometers are approximately 17 miles (27 km) to the east of the volcano as part of the Mount Veniaminof network. Mount Kupreanof is also monitored by satellite data, remote infrasound and lightning networks, and visual observations from pilots and mariners passing by the volcano. 

Minor seismic and infrasound activity signals were detected at the volcano. The typical degassing plume from the summit crater with sulfur dioxide and steam emissions observed in mostly clear satellite and web camera views.

Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions. 

Monitored CALIFORNIA VOLCANOES
Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN

Activity Update: All volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.

Past Week Observations for June 29 (0000h PDT) to July 05 (2359h PDT):

Two earthquakes greater than M1 were recorded within the Clear Lake Volcanic Field, with the largest having a magnitude of M1.2.

Typical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field; 96 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.5.

Four earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with the largest having a magnitude of M2.0.

Two earthquakes greater than M1 were recorded in the Coso Volcanic Field, with the largest having a magnitude of M1.2.

Overview:

The summit eruption of Kīlauea in Halemaʻumaʻu is paused. Overnight webcam views showed glow at both the north and south eruptive vents, while the summit has slowly deflated since yesterday morning, July 6. Current forecast models suggest that lava fountaining episode 51 will occur sometime between July 10 and 14. 

No significant activity has been noted along Kīlauea’s East Rift Zone or Southwest Rift Zone.

A summary of lava fountaining episode 50 is posted below.

NOTE: Significant changes in activity between Daily Updates are posted here: https://www.usgs.gov/observatories/hvo/observatory-messages

Summit Observations:

Bursts of moderate glow were visible at the south vent overnight, while glow at the north vent was dimmer but more consistent. Overall, glow at both vents was somewhat weaker than the previous night.

Low-level seismic tremor continues during the current pause with intermittent bursts, likely in association with gas piston cycles in the eruptive vents. Earthquake activity beneath Kaluapele (Kīlauea caldera) remains low. 

Kīlauea summit has slowly deflated since yesterday morning, July 6, interrupting the overall inflationary pattern following lava fountaining episode 50. Tilt recovery since the episode presently stands at 9.5 microradians on the Uēkahuna (UWD) tiltmeter, a decrease of 0.7 microradians since yesterday morning. Summit deflation totaled 15.3 microradians on UWD during episode 50. 

The sulfur dioxide (SO₂) emission rate from the summit is likely now varying within a typical range of 1,000 to 5,000 tonnes per day. 

Rift Zone Observations:

Rates of seismicity and ground deformation remain low in the East Rift Zone and Southwest Rift Zone. SO₂ emissions from the East Rift Zone remain below the detection limit.

Analysis:

Summit reinflation was interrupted by a transition to slow deflation yesterday morning, July 6, which continues at this time. Vent glow has been continuous since the end of episode 50. These observations indicate that another lava fountaining episode is still likely. The current forecast suggests that episode 51 will occur sometime between July 10 and 14, but if this period of slow deflation persists, it will further delay the onset of the episode.

Kīlauea has been erupting episodically since December 23, 2024, from two vents (north and south) in Halema‘uma‘u. Lava fountaining episodes, which generally last for less than 12 hours, are separated by pauses that can be longer than three weeks.

HVO continues to closely monitor Kīlauea and is in contact with Hawai‘i Volcanoes National Park and the Hawai‘i County Civil Defense Agency about eruptive hazards.

Please see the Hawaiʻi Volcanoes National Park website for visitor information: https://www.nps.gov/havo/index.htm

Summary of episode 50:

A detailed account of episode 50 is given in the HVO Status Report issued on June 27: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-HVO-2026-06-28T04:29:55+00:00

• Episode 50 of the ongoing Halemaʻumaʻu eruption at the summit of Kīlauea ended abruptly at 5:10 p.m. HST on June 27, 2026, after 7 hours of continuous lava fountaining from the north vent. The eruption is currently paused.

• Tephra fall was restricted mostly to the closed area of Hawaiʻi Volcanoes National Park to the southwest of the active Halemaʻumaʻu vents. A light fall of Peleʻs hair was reported from the town of Pāhala in Kaʻū.

   

Resources:

NOTE: HVO’s monitoring network is mostly recovered from recent power- and storm-related outages. Several summit stations, including the SDH tiltmeter, will remain offline until we are able to re-establish access across the deep tephra field southwest of the caldera.

The following links provide more information about the current eruption that began on December 23, 2024:

• Eruption resources, including the most recent map and a timeline of eruption episodes since December 23, 2024: https://www.usgs.gov/volcanoes/kilauea/science/eruption-information
• Short messages tracking the evolution of the lava fountains and eruptive activity can be found here: https://www.usgs.gov/observatories/hvo/observatory-messages
• Three Kīlauea summit livestream cameras that show eruptive lava fountains are available here: https://www.youtube.com/@usgs/streams
• Summit eruption webcams: https://www.usgs.gov/volcanoes/kilauea/summit-webcams
• Volcano Watch article on gas pistons: https://www.usgs.gov/observatories/hvo/news/volcano-watch-so-what-earth-or-least-kilauea-a-gas-piston

Hazards:

This episodic eruption is occurring within a closed area of Hawai'i Volcanoes National Park.

• Volcanic Gas: high levels of volcanic gas—primarily water vapor (H₂O), carbon dioxide (CO₂), and sulfur dioxide (SO₂)—are continually released during an eruption. Emissions can remain locally hazardous in the areas immediately downwind of the vents, even when the vents are not actively erupting. SO₂ reacts in the atmosphere to create vog (volcanic air pollution) downwind. SO₂ and vog may cause respiratory and other problems at high concentrations. Further information on vog can be found at https://vog.ivhhn.org/
• Tephra: small glassy volcanic fragments—volcanic ash, pumice, scoria, Pele’s hair and reticulite—are created by the lava fountains. A combination of fountaining dynamics and wind conditions determines where tephra fall may occur for any given eruption episode. Larger particles fall near the vents while light particles may be wafted greater distances. These particles may be remobilized during windy conditions following recent eruptive episodes. Residents and visitors should minimize exposure to these fragments, which can cause skin, eye, and respiratory irritation. More information and guidance on tephra fall hazards is available at https://seagrant.soest.hawaii.edu/resource-and-guidance-for-volcanic-tephra-fall/
• Lava flows: lava on the floor of Halemaʻumaʻu crater and the southwest side of Kaluapele, Kīlauea's summit caldera, remains hot and may slowly move in the days immediately following an eruptive episode.

Other significant hazards exist around Kīlauea caldera from Halemaʻumaʻu crater wall instability, ground cracking, and rockfalls that can be enhanced by earthquakes. Close to the eruptive vents, the tephra material on the crater rim is prone to cracking, slumping, and small landslides that sometimes expose hot and molten material within. This underscores the extremely hazardous nature of Kīlauea's caldera rim surrounding Halemaʻumaʻu crater, an area that has been closed to the public since late 2007.