The Weekly Volcanic Activity Report: July 23–29, 2025
New activity/unrest was reported for 4 volcanoes from July 23 to 29, 2025. During the same period, ongoing activity was reported for 19 volcanoes.
Seismic activity increases at Lewotobi Laki-laki volcano, Indonesia
Lewotobi Laki-laki volcano in East Flores, Indonesia experienced a sharp rise in seismic activity between 12:00 and 18:00 LT (05:00–11:00 UTC) on July 25, 2025, including 34 volcanic earthquakes of multiple types. The Alert Level remains at IV (highest).
The Weekly Volcanic Activity Report: July 16–22, 2025
New activity/unrest was reported for 5 volcanoes from July 16 to 22, 2025. During the same period, ongoing activity was reported for 21 volcanoes.
Volcanic eruption at Sundhnúk crater row causes hazardous air quality in southwest Iceland
Volcanic haze and elevated levels of sulfur dioxide (SO2) from the Sundhnúk crater range eruption are affecting the western half of Iceland, especially the southwesternmost regions. The Icelandic Meteorological Office forecasts persistent volcanic haze in the south and west through Monday, due to slow and variable winds.
The Weekly Volcanic Activity Report: July 9–15, 2025
New activity/unrest was reported for 7 volcanoes from July 9 to 15, 2025. During the same period, ongoing activity was reported for 18 volcanoes.
Eruptive activity at Sundhnúk crater row continues at decreased intensity, Iceland
While the eruption at the Sundhnúksgígar crater row, southeast of Litla-Skógfell, Iceland continues on July 18, 2025, the eruptive activity has declined in the last 24 hours.
Peru’s ‘smallest volcano in the world’ identified as baby mud volcano
The Peruvian Geophysical Institute investigated a mound near Songoña in the Cusco region, dubbed the ‘smallest volcano in the world’ by local media, and confirmed it as a small mud volcano.
New volcanic eruption opens 1 km-long fissure southeast of Litla-Skógfell, Iceland
A fissure eruption began at the Sundhnúksgígar crater row, southeast of Litla-Skógfell, Iceland, around 03:54 UTC on July 16, 2025. The eruptive fissure is approximately 700–1 000 m (2 300–3 280 feet) long and appears to be propagating northward, with lava flowing southeast and no immediate threat to infrastructure.
Sudden eruption produces dense ash plume at Erta Ale volcano, Ethiopia
A sudden explosive eruption at Erta Ale volcano in Ethiopia’s Danakil Depression produced a dense ash plume on the morning of July 15, 2025, interrupting its recent phase of steady lava activity.
Powerful phreatic eruption at Santa Teresa ausol blocks road in Ahuachapán, El Salvador
A powerful phreatic eruption occurred at the Santa Teresa ausol, part of the Los Ausoles geothermal field in Ahuachapán, El Salvador on July 10, 2025. The eruption ejected a column of boiling water, steam, and sediment, blocking an access road and damaging surrounding infrastructure. No injuries were reported.
