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.
Indonesia’s Bur ni Telong volcano was placed on alert level II (Waspada) at 06:00 local time (LT) on August 2, 2025, following a rise in deep and shallow volcanic earthquakes between July 30–August 5, 2025. The last eruption at this volcano took place in 1937.
More than 750 volcano-tectonic and hybrid earthquakes were recorded beneath the Teide–Pico Viejo volcanic complex in Tenerife, Canary Islands between August 6 and 7, 2025. This includes two seismic swarms at depths of 8–14 km (5–9 miles), with the largest event reaching M1.5.
Volcanic alert level at Kusatsu-Shiranesan’s Yugama crater, Japan was raised to Level 2 at 05:50 LT on August 4, 2025, following increased seismic activity and minor ground deformation since June.
New activity/unrest was reported for 9 volcanoes from July 30 to August 5, 2025. During the same period, ongoing activity was reported for 22 volcanoes.
