May 14 , 2025.
Italy / Sicily : Etna :
WEEKLY BULLETIN, from May 5, 2025 to May 11, 2025. (Issue date May 13, 2025)
ACTIVITY STATUS SUMMARY
Based on monitoring data, the following is highlighted:
1) VOLCANOLOGICAL OBSERVATIONS: Eruptive episode of Strombolian activity and lava flows at the Southeast Crater on May 5. Variable degassing activity from the summit craters.
2) SEISMOLOGICAL: Absence of seismic activity due to fracturing with Ml>=2.0. Tremor amplitude at a low level, except for the Strombolian activity episode.
3) INFRASOUND: Low infrasound activity. 4) GROUND DEFORMATION: Ground deformation monitoring networks did not record any significant changes except for small tilt/deformation variations during the May 5th activity.
5) GEOCHEMISTRY: SO2 fluxes at medium-low and increasing levels
Soil CO2 fluxes: medium-low values
Dissolved CO2 partial pressure in groundwater: shows no significant changes
Isotope ratio at peripheral sites: no updates
6) SATELLITE OBSERVATIONS: Thermal activity observed by satellite in the summit area was generally low-level, with high to very high values corresponding to the eruptive activity of the Southeast Crater on May 12, 2025.
VOLCANOLOGICAL OBSERVATIONS
During the week, volcanic activity at Mount Etna was monitored through the analysis of surveillance camera images from the INGV-Etneo Observatory (INGV-OE).
During the week in question, Etna’s activity was characterized by an eruptive episode with Strombolian activity and lava overflows from the Southeast Crater (CSE) and degassing activity, of varying intensity, from the Bocca Nuova Crater (BN), the Northeast Crater (CNE), and the Voragine Crater (VOR). In particular, the Northeast Crater was affected by intense impulsive degassing from a vent located on the crater floor.
In particular, the brief eruptive episode that affected the Southeast Crater (CSE) on May 5th showed a similar pattern to previous episodes. The episode began in the late morning of May 5, but due to cloud cover, it was not possible to observe the Strombolian activity that produced a modest eruptive cloud that caused a small ash fall on the east-northeast slope as far as the town of Fiumefreddo di Sicilia. During the phenomenon, two small lava flows were generated, one towards the east that split into two arms, and a smaller one towards the south.
Etna Activity Statement, May 13, 2025, 7:54 AM (5:54 UTC).
The National Institute of Geophysics and Volcanology, Osservatorio Etneo, announces that the eruptive activity reported in the previous press release has ended.
From a seismic perspective, starting around 21:45 UTC yesterday, May 12, a sudden decrease in the average amplitude of volcanic tremor was observed, reaching low values around 2:15 UTC today. The centroid of the tremor sources is currently located in the northeast crater area at an altitude of approximately 2,000 m above sea level. Infrasound activity is weak and confined to the northeast crater, with low amplitudes. Deformation data from GNSS and inclinometer monitoring networks show no significant variations. The eruptive phenomenon recorded a modest variation of approximately 33 nano-strains on the dilatometer at the DRUV station.
Further updates will be provided shortly.
Source : INGV.
Photos : Etna Walk /Giuseppe Distefano / Marco Restivo
Italy , Stromboli :
WEEKLY BULLETIN, from May 5, 2025 to May 11, 2025. (Issue date May 13, 2025)
SUMMARY OF ACTIVITY STATUS
In light of monitoring data, the following is highlighted:
1) VOLCANOLOGICAL OBSERVATIONS: During the period studied, ordinary Strombolian eruptive activity was observed. The total hourly frequency of explosions fluctuated around average values (10-13 events/hour). The intensity was low to medium in the North and South-Central crater areas.
2) SEISMOLOGY: The monitored seismic parameters do not show any significant variations.
3) GROUND DEFORMATION: Ground deformation monitoring networks did not show any significant variations.
4) GEOCHEMISTRY: SO2 flux: average level. Soil CO2 fluxes in the Pizzo area (STR02): no updates.
C/S ratio in the plume: high to very high values.
Dissolved helium isotope ratio (R/Ra) in the thermal aquifer: high values.
Soil CO2 fluxes in the San Bartolo area: medium-low values.
Soil CO2 fluxes in the Scari area: medium values.
5) SATELLITE OBSERVATIONS: Thermal activity observed by satellite in the summit area was generally low.
VOLCANOLOGICAL OBSERVATIONS
During the observation period, Stromboli’s eruptive activity was characterized by analyzing images recorded by INGV-OE surveillance cameras located at an altitude of 190 m (SCT-SCV) and at Punta dei Corvi (SPCT). Explosive activity was produced mainly by four eruptive vents located in the North Crater area and by at least two vents located in the Central-South Crater area.
Observations of Explosive Activity Captured by Surveillance Cameras
In the North (N) Crater area, four active vents were observed, producing low-intensity explosive activity (the eruptive products reached a height of less than 80 m) and sometimes moderate-intensity explosive activity (the height of the products was between 80 and 150 m). The ejected products consisted mainly of coarse materials (bombs and lapilli). The average explosion frequency ranged from 6 to 9 events per hour.
In the South-Central (SC) area, explosive activity was produced by at least two vents; the explosions were mainly of low to medium intensity, emitting fine materials (ash) sometimes mixed with coarse materials (lapilli and bombs). The average explosion frequency ranged from 2 to 5 events/hour.
Source : INGV.
Photos : Stromboli stati d’animo / Sebastiano Cannavo.
Kamchatka , Karymsky :
VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
Issued: May 10 , 2025
Volcano: Karymsky (CAVW #300130)
Current aviation colour code: ORANGE
Previous aviation colour code: orange
Source: KVERT
Notice Number: 2025-28
Volcano Location: N 54 deg 2 min E 159 deg 26 min
Area: Kamchatka, Russia
Summit Elevation: 1486 m (4874.08 ft)
Volcanic Activity Summary:
A moderate explosive activity of the volcano continues. Satellite data by KVERT show an ash cloud 10×15 km in size move for about 21 km to the southeast of the volcano.
A moderate activity of the volcano continues. Ash explosions up to 10 km (32,800 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
Volcanic cloud height:
3000-3500 m (9840-11480 ft) AMSL Time and method of ash plume/cloud height determination: 20250510/0430Z – Himawari-9 14m15
Other volcanic cloud information:
Distance of ash plume/cloud of the volcano: 21 km (13 mi)
Direction of drift of ash plume/cloud of the volcano: ESE / azimuth 111 deg
Time and method of ash plume/cloud determination: 20250510/0430Z – Himawari-9 14m15
Source : Kvert
Photo : N. Gorbach, IVS FEB RAS.
Indonesia , Dukono :
An eruption of Mount Dukono occurred on Wednesday, May 14, 2025, at 06:36 WIT with an observed ash column height of ± 1000 m above the peak (± 2087 m above sea level). The ash column was observed to be white to gray in color with a thick, eastward-facing intensity. At the time of writing, the eruption was still ongoing.
Seismicity Observation:
214 eruption earthquakes with an amplitude of 6 to 34 mm and a duration of 31.13 to 63.18 seconds.
1 distant tectonic earthquake with an amplitude of 34 mm and an earthquake duration of 105.72 seconds.
1 continuous tremor earthquake with an amplitude of 2-5 mm, with a dominant value of 3 mm.
Recommendation
People around Mount Dukono and visitors/tourists should not engage in activities, climb, or approach the Malupang Warirang crater within a 4 km radius.
Since volcanic ash eruptions occur periodically and the distribution of ash follows the direction and speed of the wind, so the area where the ash lands is not constant, people around Mount Dukono are advised to always carry masks/nose and mouth covers to use when needed to avoid the threat of volcanic ash to the respiratory system.
Source et photo : Magma Indonésie .
Colombia , Chiles / Cerro Negro :
San Juan de Pasto, May 13, 2025, 3:50 .
Monitoring the activity of the Chiles/Cerro Negro volcanoes, the Colombian Geological Survey (SGC), entity affiliated with the Ministry of Mines and Energy, reports that:
During the period from May 6 to 12, 2025, the main variations in the monitored parameters compared to the previous week were:
● There was a significant increase in seismicity, both in terms of occurrence and seismic energy released, linked to an earthquake swarm (a large number of events over relatively short periods of time, without identifying a main event as such) that began on the night of May 4 and gradually decreased over the last three days, peaking at 3,664 events on May 6. During this period, just over 11,000 earthquakes were recorded, with seismic activity associated with rock fractures predominating, as well as events related to fluid dynamics within the volcanic system.
● The vast majority of earthquakes were located in the Chiles Volcano collapse zone, at distances less than 2.5 km from its summit (4,700 m above sea level), with depths between 1.5 and 4 km and a maximum magnitude of 2.6. A few other events were located at distances of up to 10.5 km southeast and northeast of Chiles Volcano, with depths of up to 9 km and a maximum magnitude of 2. No earthquakes were reported as felt.
● Analysis of data from satellite sensors and ground stations continues to reveal changes related to deformation processes in the volcanic zone.
Based on the assessment and correlation of monitored parameters, the SGC recommends closely monitoring developments through weekly bulletins and other information published through our official channels, as well as instructions from local and departmental authorities and the National Disaster Risk Management Unit (UNGRD).
Volcanic activity remains on Yellow alert: Active volcano with changes in the baseline behavior of monitored parameters and other manifestations.
Source et photo : SGC
