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Porth, Newquay, Cornwall. UK
Updated:  11/09/2026 17:30 
 


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Updated
11 Sep 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

September 11th, 2026 12:40:58 EDT -0400 NMI Ahyi Seamount YELLOW/ADVISORY - Faint water discoloration seen in satellite images; no significant geophysical signals.
Sep 10, 2026 23:25 - No notable activity was detected in distal geophysical monitoring data over the past week. However, faint discoloration of the ocean surface above Ahyi seamount was seen in high resolution satellite data from September 7.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 ...
September 11th, 2026 12:40:58 EDT -0400 HVO Kilauea ORANGE/WATCH - Kīlauea volcano is intermittently erupting short, precursory lava flows continuing the activity that began September 7. The forecast window for onset of episode 55 fountaining is now September 10-11 given no change in summit inflation since yesterday.
Sep 10, 2026 18:21 - Overview:Kīlauea volcano has been intermittently erupting lava flows from the north vent in Halemaʻumaʻu since September 7. A total of 50 overflows have occurred since then, with the most recent ending at 1:17 a.m. HST this morning. This style of activity has been typical in the hours to days before a summit lava fountaining episode. However, summit reinflation has been very irregular since lava fountaining episode 54 on August 25 and over the past 24 hours has shown little net change, remaining about 0.5 microradians below the episode 54 starting level. The lack of ...
September 11th, 2026 12:40:58 EDT -0400 AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava within the summit crater continues, with weak seismicity and steaming.
Sep 10, 2026 18:12 - Lava continues to erupt slowly within the summit crater of Great Sitkin Volcano. Minor earthquakes were detected in the past day. Steaming at the summit dome was observed in clear webcam views of the volcano.The current eruption began in July 2021. 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.
September 11th, 2026 12:40:58 EDT -0400 AVO Shishaldin YELLOW/ADVISORY - Low-level seismic unrest continues, with weak seismicity and a summit gas plume.
Sep 10, 2026 18:12 - Unrest continues at Shishaldin Volcano, with minor seismic activity detected in the past day. Webcam views of the volcano showed the typical gas plume emanating from the summit of the volcano. The SO2 gas plume was also detected in satellite data.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.
September 11th, 2026 12:40:58 EDT -0400 AVO Kupreanof UNASSIGNED/UNASSIGNED - Seismic activity at a very low level; weak steaming continues. Volcano lowered to UNASSIGNED.
Sep 9, 2026 18:41 - Seismic activity at Kupreanof Volcano over the past day was very low. Weak steaming from fumaroles on the flank of the volcano was seen in clear webcam views. Because of the sharp drop in seismicity to very low levels over the past month, and the decrease in SO2 gas emissions, the volcano's Aviation Color Code and Volcano Alert Level were lowered to UNASSIGNED yesterday afternoon. The volcano was not lowered to GREEN and NORMAL because of insufficient coverage by ground-based monitoring data.A new temporary monitoring station was installed recently near Mount Kupreanof and ...
September 11th, 2026 12:40:58 EDT -0400 CALVO GREEN/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.
Sep 8, 2026 18:56 - 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 August 31 (0000h PDT) to September 06 (2359h PDT):One earthquake greater than M1 was recorded near Mount Shasta, with a magnitude of ...
September 11th, 2026 12:40:58 EDT -0400 CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Sep 4, 2026 20:05 - 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 and Mount St. Helens. All monitoring data are consistent with background activity levels in the Cascade Range. Earlier this week, field crews conducted site visits at ...
September 11th, 2026 12:40:58 EDT -0400 HVO Ofu-Olosega GREEN/NORMAL - No activity of concern for Ofu-Olosega.
Sep 3, 2026 18:56 - 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.
September 11th, 2026 12:40:58 EDT -0400 HVO Ta'u Island GREEN/NORMAL - No activity of concern for Taʻū Island
Sep 3, 2026 18:56 - 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.The TAU1 GPS station has experienced intermittent data outages and HVO is evaluating the quality of ...
September 11th, 2026 12:40:58 EDT -0400 HVO Tutuila Island GREEN/NORMAL - No activity of concern for Tutuila Island
Sep 3, 2026 18:56 - 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.
September 11th, 2026 12:40:58 EDT -0400 HVO Mauna Loa GREEN/NORMAL - Mauna Loa earthquake counts increased in August, while the summit region showed no other signs of deformation.
Sep 3, 2026 18:41 - Mauna Loa had an increase in seismic activity compared to the previous month; a total of 87 earthquakes were detected in Mauna Loa's summit region during the August reporting period, after 57 in July. Most earthquakes occurred deep beneath the upper Southwest Rift Zone or broadly scattered around the upper flanks. Very few earthquakes occurred directly beneath Mokuʻāweoweo.Data from Global Positioning System (GPS) instruments on Mauna Loa showed slight inflation across the summit region in the past month. Most GPS stations at the summit recorded small upward vertical ...
September 11th, 2026 12:40:58 EDT -0400 HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Sep 3, 2026 18:41 - 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.
September 11th, 2026 12:40:58 EDT -0400 HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā.
Sep 3, 2026 18:41 - No significant activity was detected at Haleakalā volcano during the past month. The continuously recording Global Positioning System (GPS) instrument on Haleakalā lost connection on July 13th. No significant deformation was recorded leading up to the outage. The station is owned and operated by researchers at the Pacific GPS Facility (PGF), as part of the Hawaii Institute of Geophysics and Planetology (HIGP), who will service the station within the next few months to bring it back online.
September 11th, 2026 12:40:58 EDT -0400 HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.
Sep 3, 2026 18:41 - No significant activity was detected at Mauna Kea 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 Mauna Kea, operated by NASA's Jet Propulsion Laboratory, recorded no significant deformation in the past month.
September 11th, 2026 12:40:58 EDT -0400 HVO Kama'ehuakanaloa UNASSIGNED/UNASSIGNED - No activity of concern for Kamaʻehuakanaloa.
Sep 3, 2026 18:41 - No significant activity was detected at Kamaʻehuakanaloa volcano (formerly Lōʻihi Seamount) during the past month. Seismic activity remained low and was representative of background activity levels at the volcano.

 

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].