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Porth, Newquay, Cornwall. UK
Updated:  01/08/2026 20:45 
 


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01 Aug 2026 00:00
 
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Volcano Alerts and Activity Reports

Provided by usgs.gov Recent Volcano Observatory Activity Reports
Recent Volcano Observatory Activity Reports

Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program

August 1st, 2026 15:49:09 EDT -0400 AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues.
Aug 1, 2026 19:17 - Slow eruption of lava within the summit crater continues. Minor earthquakes were detected over the past day and typical steaming was observed in a high resolution satellite image. Web camera observations were obscured by clouds.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 ...
August 1st, 2026 15:49:09 EDT -0400 AVO Kupreanof YELLOW/ADVISORY - Seismic activity very low over the past day.
Aug 1, 2026 19:17 - Earthquake activity was very low over the past day. Satellite and web camera observations were obscured by clouds. A new temporary monitoring station was installed recently near Mount Kupreanof and is providing seismic data, infrasound data, gas measurements, and web camera images on an intermittent basis. This is by design to conserve battery power, but the frequency of data acquisition can be increased if activity warrants. The closest functioning seismometers that provide continuous data are approximately 10 miles (16 km) to the northeast of the volcano as part of the ...
August 1st, 2026 15:49:09 EDT -0400 AVO Shishaldin YELLOW/ADVISORY - Seismic and infrasound events continue. SO2 emissions observed in satellite.
Aug 1, 2026 19:17 - Minor seismic activity and infrasound were detected at the volcano during the past day. Sulfur dioxide emissions were observed in satellite data from yesterday afternoon. Satellite and web camera observations of the volcano were obscured by clouds.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.
August 1st, 2026 15:49:09 EDT -0400 HVO Kilauea YELLOW/ADVISORY - Kīlauea volcano is not erupting; the summit eruption in Halemaʻumaʻu is paused. Reinflation indicates another episode is likely with the preliminary forecast between August 6 and 14.
Aug 1, 2026 19:07 - Overview:The summit eruption of Kīlauea in Halemaʻumaʻu is paused after the end of episode 52 on July 28-29, 2026. Glow from summit vents and inflationary tilt continued through the past day, suggesting that another episode is likely. Preliminary models indicate that the forecast window for episode 53 is between August 6 and August 14.No significant activity has been noted along Kīlauea’s East Rift Zone or Southwest Rift Zone.A summary of episode 52 is posted below.NOTE: Significant changes in activity between Daily Updates are posted here: ...
August 1st, 2026 15:49:09 EDT -0400 YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation
Aug 1, 2026 15:05 - Yellowstone Caldera activity remains at background levels, with 68 located earthquakes in July (largest = M3.3). Deformation measurements indicate no significant uplift of the north caldera rim since January 2026 and only minor uplift of the caldera since the beginning of the year. Recent Work and NewsIn response to the small hydrothermal explosion at Biscuit Basin on June 13, a new camera was installed in the area on July 22 with a view of both Black Diamond Pool (site of a hydrothermal explosion in 2024) and the June 13 explosion area. Camera images are updated every 15 ...
August 1st, 2026 15:49:09 EDT -0400 CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Jul 31, 2026 19:05 - Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.Past Week Observations: During the past week, small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood. All monitoring data are consistent with background activity levels in the Cascade Range. Field crews conducted station maintenance at ...
August 1st, 2026 15:49:09 EDT -0400 NMI Ahyi Seamount YELLOW/ADVISORY - No underwater plumes observed in satellite images or in distal geophysical data this past week.
Jul 30, 2026 21:02 - There were several clear satellite images of the ocean over Ahyi Seamount this past week, but there were no observations of underwater plumes. Distal geophysical monitoring showed no evidence of activity. Eruptive activity at Ahyi Seamount may present a hazard to mariners in the water above and near the volcano. The summit has shallowed over the course of previous eruptions to 180 feet (55 m) below sea level, but the lack of local real-time data means we are unable to forecast or warn of impending eruptions. We will continue to monitor satellite and distal hydroacoustic ...
August 1st, 2026 15:49:09 EDT -0400 CALVO GREEN/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.
Jul 28, 2026 15:58 - Monitored CALIFORNIA VOLCANOESCurrent Volcano Alert Level: all NORMALCurrent Aviation Color Code: all GREENActivity 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 July 20 (0000h PDT) to July 26 (2359h PDT):One earthquake greater than M1 was recorded near Mount Shasta, with a magnitude of ...
August 1st, 2026 15:49:09 EDT -0400 AVO Katmai GREEN/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN/NORMAL.
Jul 25, 2026 00:19 - Strong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and are carrying it to the southeast. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft (1.8 km) above sea level.This phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No eruption is in ...
August 1st, 2026 15:49:09 EDT -0400 AVO Atka volcanic complex GREEN/NORMAL - Unrest has declined. Color Code and Alert Level Level lowered to GREEN/NORMAL.
Jul 21, 2026 20:08 - A small explosion from Korovin Volcano within the Atka Volcanic complex was detected in seismic and infrasound data on July 16, 2026. Since then, unrest has declined. As a result, the Aviation Color Code and Alert Level are being lowered to GREEN/NORMAL.
August 1st, 2026 15:49:09 EDT -0400 HVO Ofu-Olosega GREEN/NORMAL - No activity of concern for Ofu-Olosega.
Jul 2, 2026 19:50 - No significant activity was detected at Ofu-Olosega volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano.
August 1st, 2026 15:49:09 EDT -0400 HVO Ta'u Island GREEN/NORMAL - No activity of concern for Taʻū Island
Jul 2, 2026 19:50 - No significant activity was detected at Taʻū volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano. A Global Positioning System (GPS) instrument on Taʻū Island recorded no significant deformation.The FAGA broadband seismometer located on eastern Taʻū Island is currently out of service. The TAU broadband seismometer on western Taʻū Island remains operational.
August 1st, 2026 15:49:09 EDT -0400 HVO Tutuila Island GREEN/NORMAL - No activity of concern for Tutuila Island
Jul 2, 2026 19:50 - No significant activity was detected at Tutuila volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano.
August 1st, 2026 15:49:09 EDT -0400 HVO Mauna Loa GREEN/NORMAL - Mauna Loa earthquake counts decreased in June, while the summit region contracted slightly.
Jul 2, 2026 15:20 - Mauna Loa had a decrease in seismic activity compared to the previous month; a total of 94 earthquakes were detected in Mauna Loa's summit region during the June reporting period, after 170 in May. Earthquakes were broadly scattered beneath Mokuʻāweoweo, the upper Southwest Rift Zone, and the upper northwest flank.Data from Global Positioning System (GPS) instruments on Mauna Loa showed slight contraction across the summit region in the past month. Similar pauses have been previously detected during the overall inflationary period that has persisted since the 2022 ...
August 1st, 2026 15:49:09 EDT -0400 HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Jul 2, 2026 15:20 - No significant activity was detected at Hualālai volcano during the past month. Seismic activity remained low and was representative of background activity levels at the volcano. The continuously recording Global Positioning System (GPS) instrument on Hualālai has been offline since March 15, 2026; HVO field engineers will service the station within the next few months to bring it back online.

 

Volcano Alert Levels
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
UNASSIGNED

 

Aviation Alert Color Codes ICAO
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].