November 30 , 2025.
La Réunion Island , Piton de la Fournaise :
Press Release from the Paris Institute of Earth Physics, Piton de la Fournaise Volcanological Observatory, November 28, 2025 – 3:40 PM local time – 11:40 AM UTC
Press Release Following Increased Seismicity
Since November 26, summit seismicity at Piton de la Fournaise has been steadily increasing. The number of recorded events has risen from approximately one earthquake per hour yesterday at 5:00 PM (local time) to more than three earthquakes per hour since this morning, November 28, at 10:00 AM (local time). This trend is illustrated in Figure 1.
No significant deformation has been observed on the volcano so far.
This increase in summit seismicity, although consisting mainly of low-magnitude events, nevertheless reflects an acceleration of activity beneath the summit and a pressurization of the shallow reservoir, necessitating enhanced operational monitoring.
For comparison, during the reactivation in June 2014 (after a 3.5-year dormancy period), an increase in seismicity was observed one week before the onset of measurable inflation, and this renewed activity led to an eruption approximately two weeks later.
It should be noted that this pressurization process of the shallow reservoir can last from several days to several weeks before the reservoir roof ruptures, resulting in magma injection towards the surface and potentially an eruption, but it can also cease without leading to an eruption in the short term.
Histogram showing the number of shallow volcano-tectonic earthquakes per hour since November 25 (© OVPF-IPGP).
The OVPF-IPGP is continuing enhanced monitoring of Piton de la Fournaise and will report any significant developments.
Given the « unprecedented » seismic activity beneath the summit area, a proposal is being made to move the « Piton de la Fournaise » Emergency Response Plan (ORSEC) to its Vigilance phase.
Source : direction de l’OVPF-IPGP
Photos : Imaz Press , OVPF.
Italy , Stromboli :
November 29, 2025, 02:26 (01:26 UTC). Press release on Stromboli activity.
The National Institute of Geophysics and Volcanology, Etna Observatory, announces that analysis of surveillance camera images has revealed, since approximately 00:35 UTC, a lava flow originating from the North Crater, producing lava in the upper part of the Sciara del Fuoco. This flow is accompanied by continuous lava ejection from at least two vents located in the North Crater.
From a seismic perspective, the average amplitude of volcanic tremor is currently at a moderate level. No significant changes have been observed in the frequency or amplitude of explosion earthquakes, which remain very low.
Data from ground deformation monitoring networks show no significant changes.
Further updates will be provided shortly.
Source : INGV.
Photo : Stromboli stati d’animo / Sebastiano Cannavo
Indonesia , Ibu :
Mount Ibu erupted on Friday, November 28, 2025, at 10:00 AM WIT. An ash column was observed approximately 600 meters above the summit (at an altitude of about 1,925 meters). This ash column was gray and dense, drifting southeast. The eruption was recorded by a seismograph with a maximum amplitude of 28 mm and a duration of 75 seconds.
VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA
Issued : November 28 , 2025
Volcano : Ibu (268030)
Current Aviation Colour Code : ORANGE
Previous Aviation Colour Code : orange
Source : Ibu Volcano Observatory
Notice Number : 2025IBU1158
Volcano Location : N 01 deg 29 min 17 sec E 127 deg 37 min 48 sec
Area : North Maluku, Indonesia
Summit Elevation : 4240 FT (1325 M)
Volcanic Activity Summary :
Eruption with volcanic ash cloud at 01h00 UTC (10h00 local).
Volcanic Cloud Height :
Best estimate of ash-cloud top is around 6160 FT (1925 M) above sea level or 1920 FT (600 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
Other Volcanic Cloud Information :
Ash cloud moving to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick.
Remarks :
Eruption recorded on seismogram with maximum amplitude 28 mm and maximum duration 75 second.
Source et photo : Magma Indonésie.
Colombia , Nevado del Ruiz :
Manizales, November 25, 2025, 6:00 PM
Regarding the monitoring of activity at the Nevado del Ruiz volcano, the Colombian Geological Survey (SGC), an agency under the Ministry of Mines and Energy, reports the following:
During the week of November 18-24, 2025, the volcano continued to exhibit unstable behavior. Compared to the previous week, the main variations in monitored parameters were as follows:
– Seismic activity associated with rock fracturing processes within the volcanic edifice increased slightly, both in the number of recorded earthquakes and in the seismic energy released. The earthquakes were primarily located within the Arenas crater, at depths of up to 3 km, and in the north-northeast, northeast, and east-northeast sectors, at distances of less than 5 km from the crater and at depths between 2 and 6 km from the volcano’s summit. Less intense and more diffuse seismic activity was also observed on the other flanks of the volcano, up to 13 km from the crater and at depths between 3 and 9 km. The maximum recorded magnitude was 2.4, corresponding to the earthquake of November 24 at 9:25 PM, located 2 km northeast of the crater and at a depth of 4 km.
Seismicity related to fluid dynamics in volcanic conduits was primarily characterized by short-duration, low-energy signals. This seismicity showed an increase in the number of events, while maintaining similar levels of seismic energy released. Long-duration signals, on the other hand, decreased in both the number of earthquakes and the seismic energy released.
– Thanks to the cameras (conventional and thermographic) used to monitor the volcano, several pulsed ash emissions were confirmed, as well as variations in the apparent temperature of the materials emitted during these emissions.
The emission of water vapor and volcanic gases, primarily sulfur dioxide (SO₂), into the atmosphere from the Arenas crater continued. Daily SO₂ fluxes exhibited variability and decreased compared to the previous week. This decrease was mainly due to weak winds and changes in wind direction, which were unfavorable to the monitoring stations. Complementary satellite monitoring continues to show ongoing SO₂ emissions.
The vertical height of the gas, water vapor, or ash plume remained mostly below 500 m, occasionally reaching 1100 m above the volcano’s summit. Regarding the direction of dispersion, the plume showed a preferential tendency toward the southwest and northwest flanks of the volcanic structure.
During the monitoring of thermal anomalies at the bottom of the Arenas crater using satellite platforms, detection remained limited by the thick cloud cover over the volcanic area. However, some low-energy anomalies were detected.
Source et photo : SGC.
Alaska , Shishaldin :
Signs of volcanic unrest at Shishaldin continued this week. Vigorous steaming from the summit crater was observed in web cameras and satellite images over the past several days but there was no evidence of ash emissions. Pilot reports from November 27 estimated the steam plume reached an altitude of 15,000 ft (4.6 km) above sea level. Low-level seismicity is ongoing, with frequent small earthquakes occurring daily.
Infrasound signals were detected throughout the week, and the amplitude increased late in the week during the period of increased steam emissions. The infrasound signals are likely caused by gas bubbles bursting through magma deep within the volcanic vent. Satellite data show no evidence of elevated temperatures or other changes within the summit crater, indicating no lava at or near the surface.
Shishaldin Volcano is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to monitor the volcano.
Source : AVO.
Photo : via Terri Phillips Hubble / FB.
