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Porth, Newquay, Cornwall. UK
Updated:  04/05/2026 11:30 
 


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Updated
04 May 2026 00:00
 
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Larkhill
 
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Okehampton, East Okement Farm
 
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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

May 4th, 2026 06:38:01 EDT -0400 AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues. Slightly elevated surface temperatures observed.
May 3, 2026 19:58 - Slow lava effusion continues within the Great Sitkin summit crater. Over the past day, seismic data recorded rockfalls from the growing lava dome. Slightly elevated surface temperatures observed in satellite images over the past day. No significant activity was observed in web camera views. The current lava eruption began in July 2021 and, since then, has 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, ...
May 4th, 2026 06:38:01 EDT -0400 AVO Shishaldin YELLOW/ADVISORY - Unrest continues with ongoing seismic and infrasound signals. Sulfur dioxide emissions detected.
May 3, 2026 19:58 - Unrest persists at Shishaldin Volcano, with seismic and infrasound activity remaining elevated over the past day. No significant activity was observed in cloudy web camera and satellite views. Satellite data from the past day show sulfur dioxide emissions.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.
May 4th, 2026 06:38:01 EDT -0400 HVO Kilauea YELLOW/ADVISORY - The eruption at the summit of Kīlauea is currently paused. Forecast window for episode 46 is May 4 - May 7, 2026.
May 3, 2026 19:48 - Overview:The eruption at the summit of Kīlauea is currently paused. The forecast window for episode 46, based on tilt data, suggests that lava fountaining will occur again sometime between Monday, May 4 and Thursday, May 7. This window may be adjusted based on continuing observations.No significant activity has been noted along Kīlauea’s East Rift Zone or Southwest Rift Zone.Note: Significant changes in activity between Daily Updates are posted here: https://www.usgs.gov/observatories/hvo/observatory-messages Summit Observations:Consistent, bright glow, frequent bursts ...
May 4th, 2026 06:38:01 EDT -0400 YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation
May 1, 2026 20:22 - SummaryYellowstone Caldera activity remains at background levels, with 97 located earthquakes in April (largest = M2.5). Deformation measurements indicate no significant uplift or subsidence of the caldera or north caldera rim since January 2026. Recent Work and NewsEchinus Geyser, in Norris Geyser Basin, reawakened from a several-year slumber in February, with about 40 eruptions that month, but the geyser had only four eruptions in April. At Black Diamond Pool in Biscuit Basin (site of a hydrothermal explosion in 2024), two eruptions were recorded during the month by ...
May 4th, 2026 06:38:01 EDT -0400 CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
May 1, 2026 18:32 - 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: Small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood during the past week. All monitoring data are consistent with background activity levels in the Cascade Range. Field engineers took advantage of excellent ...
May 4th, 2026 06:38:01 EDT -0400 CALVO GREEN/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.
Apr 28, 2026 18:11 - 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 April 20 (0000h PDT) to April 26 (2359h PDT):Typical seismicity was recorded at The Geysers geothermal field south of the Clear Lake ...
May 4th, 2026 06:38:01 EDT -0400 NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - Plume of discolored water observed in satellite image this week.
Apr 16, 2026 22:02 - High-resolution satellite imagery revealed a point source plume of discolored water near Ahyi Seamount on April 10 and a diffuse plume on April 13. No signs of volcanic activity or unrest were detected in data from remote underwater pressure sensors, nor were there any other indicators suggesting significant unrest. The last time a similar plume was visible in satellite imagery was on April 8, 2026; however, persistent cloud cover and limited availability of high-quality satellite images have made it challenging to monitor such occurrences consistently.There are no local ...
May 4th, 2026 06:38:01 EDT -0400 AVO Atka volcanic complex GREEN/NORMAL - Decreased seismicity and gas detections.
Apr 13, 2026 23:47 - Seismic activity, sulfur dioxide emissions, and thermal anomalies at Korovin Volcano (located within the Atka Volcanic Complex) have declined over the past couple weeks and are now at background levels. The Aviation Color Code and the Alert Level for the Atka Volcanic Complex are being lowered to GREEN/NORMAL. Small explosive events can occur at Korovin Volcano without significant precursory unrest. Fallout of ash from such events is unlikely to extend beyond the upper flanks of the volcano.
May 4th, 2026 06:38:01 EDT -0400 HVO Ofu-Olosega GREEN/NORMAL - No activity of concern for Ofu-Olosega.
Apr 2, 2026 18:49 - 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.
May 4th, 2026 06:38:01 EDT -0400 HVO Ta'u Island GREEN/NORMAL - No activity of concern for Taʻū Island
Apr 2, 2026 18:49 - 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. Local residents reported a landslide occurring on March 26, 2026 SST, between Ta‘ū and Fiti‘uta, but the event is not readily visible on the local monitoring station data. 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. ...
May 4th, 2026 06:38:01 EDT -0400 HVO Tutuila Island GREEN/NORMAL - No activity of concern for Tutuila Island
Apr 2, 2026 18:49 - 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.
May 4th, 2026 06:38:01 EDT -0400 HVO Mauna Loa GREEN/NORMAL - Mauna Loa earthquake counts slightly decreased in March, and inflationary ground deformation continued.
Apr 2, 2026 18:36 - Mauna Loa had decrease in seismic activity compared to the previous month, with clustering of events under Mokuʻāweoweo and the upper Southwest Rift Zone still present. A total of 86 earthquakes were detected beneath Mauna Loa's summit region in the February reporting period, while the prior month had 116 earthquakes. Data from Global Positioning System (GPS) instruments on Mauna Loa show variable rates of inflation at the summit over the past six months. This is associated with refilling of the summit reservoir system following the 2022 eruption.Gas and temperature ...
May 4th, 2026 06:38:01 EDT -0400 HVO Kama'ehuakanaloa UNASSIGNED/UNASSIGNED - No activity of concern for Kamaʻehuakanaloa.
Apr 2, 2026 18:36 - No significant activity was detected at Kamaʻehuakanaloa (formerly Lōʻihi Seamount) during the past month. Seismic activity remained low, and was representative of background activity levels at the volcano; all earthquakes were of small magnitudes.
May 4th, 2026 06:38:01 EDT -0400 HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Apr 2, 2026 18:36 - 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 recorded no significant deformation through the first half of March, and went offline on March 15. HVO field engineers will service the station to get it back online.
May 4th, 2026 06:38:01 EDT -0400 HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā.
Apr 2, 2026 18:36 - No significant activity was detected at Haleakalā volcano during the past month. HVO seismometers recorded one earthquake, under the onshore tip of the Southwest Rift Zone. The continuously recording Global Positioning System (GPS) instrument on Haleakalā recorded no significant deformation in the past month.

 

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].