The Alaska Volcano Observatory (AVO) raised the Volcano Alert Level for Shishaldin volcano, Alaska, to Advisory and the Aviation Color Code to Yellow at 11:48 AKDT (19:48 UTC) on August 25, 2025, following increased seismicity, gas emissions, and vapor activity.
Strombolian activity and lava flows continue at Etna’s Southeast Crater, with new vents opening on the southern flank. On August 25, the Aviation Color Code was briefly raised to Red following intensified eruptive activity.
New activity/unrest was reported for 7 volcanoes from August 13 to 19, 2025. During the same period, ongoing activity was reported for 20 volcanoes.
The Alaska Volcano Observatory lowered the Volcano Alert Level for Mount Spurr to Normal and the Aviation Color Code to Green at 10:07 AKDT (18:07 UTC) on August 20, 2025, following a gradual decline in unrest and the absence of ground deformation since March 2025.
A large landslide occurred in the village of Imerovigli on the island of Santorini, Greece, at 15:30 LT (12:30 UTC) on August 20, 2025, collapsing part of the volcanic caldera cliff and generating a dense dust cloud over the area.
Mount Ruapehu Crater Lake is warming again, with temperatures rising to 16°C (61°F) by August 19, 2025. The Volcanic Alert Level remains at 1, indicating minor volcanic unrest.
New lava flow from Mount Etna’s summit is advancing along the southern flank, reaching an elevation of about 2 270 m (7 450 feet). The most advanced front is now located about 2 km (1.24 miles) from the Altamontana trail, a major access route used for monitoring and hiking, following effusion that began on August 9, 2025.
Lewotobi volcano in Indonesia erupted on August 17, 2025, emitting volcanic ash up to 9 800 m (32 000 feet) above sea level, according to the Darwin Volcanic Ash Advisory Center (VAAC).
A new lava vent has opened between Bocca Nuova and Southeast Crater on Mount Etna, Italy, at an elevation of about 2 980 m (9 777 feet), producing a steady lava flow and explosive activity at Southeast Crater.
Mount Marapi in West Sumatra, Indonesia, erupted at 08:39 local time (LT) on August 12, 2025, producing an ash plume approximately 1 600 m (5 250 feet) above the summit, or about 4 491 m (14 735 feet) above sea level, drifting toward the northeast.
