May 5 , 2025.
Indonesia , Semeru :
An eruption of Mount Semeru occurred on Monday, May 5, 2025, at 07:11 WIB with an observed ash column height of ± 500 m above the peak (± 4176 m above sea level). The ash column was observed to be white to gray in color with a thick intensity, oriented southwest. This eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 147 seconds.
VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA
Issued : May 05 , 2025
Volcano : Semeru (263300)
Current Aviation Colour Code : ORANGE
Previous Aviation Colour Code : orange
Source : Semeru Volcano Observatory
Notice Number : 2025SMR1785
Volcano Location : S 08 deg 06 min 29 sec E 112 deg 55 min 12 sec
Area : East java, Indonesia
Summit Elevation : 11763 FT (3676 M)
Volcanic Activity Summary :
Eruption with volcanic ash cloud at 00h11 UTC (07h11 local).
Volcanic Cloud Height :
Best estimate of ash-cloud top is around 13363 FT (4176 M) above sea level or 1600 FT (500 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 southwest. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick.
Remarks :
Eruption recorded on seismogram with maximum amplitude 22 mm and maximum duration 147 second.
Source et photo : Magma Indonésie .
Colombia , Galeras :
San Juan de Pasto, April 29, 2025, 4:20 p.m.
Monitoring the activity of the Galeras Volcano, the Colombian Geological Survey (SGC), an entity affiliated with the Ministry of Mines and Energy, reports that:
Between April 22 and 28, 2025, volcanic activity showed variations in seismicity. The main changes in the behavior of the monitored parameters were:
• An increase in seismic activity and energy release was recorded, with seismic activity related to rock fracturing within the volcanic edifice remaining predominant.
• Most of the earthquakes related to fracture processes were located within a 1.0 km radius of the main crater, with depths less than 3.0 km from the summit of the Galeras Volcano (4,200 m above sea level) and low seismic energy levels. The remaining events were distributed scattered throughout the area of influence of the volcanic complex, reaching distances of up to 17 km, depths of 16 km and a maximum magnitude of 1.1.
• Gas emissions were observed mainly from the El Paisita fumarole fields, to the north, and Las Chavas, to the west of the active cone. The columns, low and white in color, exhibited variable dispersion determined by wind direction.
• Other volcanic monitoring parameters remained stable.
Based on the above, 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 alert. Yellow: active volcano with changes in the baseline level of monitored parameters and other manifestations.
Source et photo :
Ecuador , Sangay :
SANGAY VOLCANO DAILY STATUS REPORT, Sunday, May 4, 2025.
Information Geophysical Institute – EPN.
Surface Activity Level: High, Surface Trend: Ascending
Internal Activity Level: Moderate, Internal Trend: Ascending
Seismicity: From May 3, 2025, 11:00 a.m. to May 4, 2025, 11:00 a.m.:
Seismicity:
Below is the count of seismic events recorded at the reference station.
Explosion (EXP): 269
Rainfall/Lahars:
Since yesterday afternoon, no rain has been recorded in the volcano area. **Heavy rains could remobilize accumulated material, generating mud and debris flows that would cascade down the volcano’s flanks and flow into adjacent rivers**.
Emission/Ash Column:
Yesterday afternoon, the camera system observed gas and ash emissions at altitudes between 1,000 and 1,300 meters above the crater, oriented northwest. In connection with this activity, the Washington-based VAAC agency issued three emission reports from 1,100 to 2,400 meters above the crater level, in a west and northwest direction.
Other monitoring parameters:
The FIRMS satellite system recorded four thermal anomalies, the MIROVA-MODIS satellite system recorded one thermal anomaly, and the MIROVA-VIIRS satellite system recorded one thermal anomaly over the past 24 hours.
Observation:
During the night, the surveillance camera system observed the descent of incandescent material down the flanks, up to 1,000 meters from the crater.
As of the closing date of this report, the volcano remained cloudy most of the time.
Alert level: Yellow
Source : IGEPN
Photo : lenin.izaa via Volcan Sangay / FB.
Guatemala , Santiaguito :
Weather: Partly cloudy.
Wind: North.
Precipitation: 20.0 mm.
Activity:
The Santa María-Santiaguito Volcanic Complex Observatory reports volcanic activity on the Caliente Dome, consisting of weak explosions occurring at a rate of 3 to 5 per hour, which lift columns of gas and ash up to 700 meters high above the Dome, moving south and southeast. Weak to moderate, almost constant degassing is also observed from the northern and northeastern edges of the dome, raising columns of water vapor and other magmatic gases to heights of up to 400 meters above the dome.
In the early morning, an incandescent light was observed on the dome’s cupola and on the promontory above the lava flow on the western flank, as well as the detachment of incandescent lava blocks towards the southwest, south, and east flanks. Light ashfall could be recorded in areas south and east of the domes, from Loma Linda to Viejo Palmar. Activity remains at a high level, so there is a possibility of generating pyroclastic density currents over long distances towards the southwest, south, and southeast.
Source : Insivumeh
Photo : Kyle Weinstein photography / FB ( 2022).
Mexico , Popocatepetl :
Activity over the past 24 hours, May 4, 11:00 a.m. (May 4, 5:00 p.m. GMT)
Thirty-five low-intensity exhalations accompanied by water vapor and other volcanic gases were detected. In addition, 63 minutes of low-amplitude tremor segments were recorded, including 5 minutes of high-frequency tremor and 58 minutes of harmonic tremor.
At the time of writing, visibility is partial due to cloud cover in the area. However, in the early morning hours, a continuous emission of water vapor and volcanic gases was observed, moving toward the east-southeast.
The Popocatépetl volcano fire alert is at yellow phase 2.
The scenarios predicted for this phase are:
A few minor to moderate explosions
Occurrence of tremors of varying amplitude
Light to moderate ashfall in surrounding towns and some more distant towns
Ejection of incandescent fragments within a 12-kilometer exclusion radius
Lahars could tumble down ravines due to ash accumulation on the slopes and their interaction with the rains expected in the coming weeks.
Possibility of pyroclastic flows not affecting populations
Source et photo : Cenapred
