A small explosion occurred at Korovin volcano on Atka Island, Alaska, at 21:27 AKDT on October 29, 2025, prompting the Alaska Volcano Observatory to raise the Aviation Color Code and Alert Level to Yellow / Advisory.
Four short-lived eruptions were recorded at the northeastern portion of the Taal Main Crater between October 25 and 26, 2025, producing dense plumes 1 200–2 100 m (3 900–6 900 feet) high and minor ashfall over nearby barangays in Laurel and Agoncillo, Batangas Province. PHIVOLCS classified the events as minor phreatic and phreatomagmatic eruptions, with associated shockwaves and localized pyroclastic density currents, but maintained Alert Level 1 (low-level unrest) over the volcano.
A strong seismic swarm began beneath Iceland’s Mýrdalsjökull glacier, part of the Katla volcanic system, around 10:30 UTC on October 20, 2025. Several earthquakes above magnitude 3 were recorded, the largest reaching M4.5 at 10:51 UTC. The Icelandic Meteorological Office reports no felt activity and no changes in river levels, conductivity, or deformation, indicating no immediate signs of eruption at the Katla volcano or glacial flooding.
Episode 35 of the ongoing Halemaʻumaʻu eruption at Kīlauea volcano began at 20:05 HST on October 17, 2025 (06:05 UTC on October 18), producing simultaneous fountains from the north and south vents that reached record heights of approximately 460 m (1 500 feet). The eruption cloud rose above 6 000 m (20 000 feet) while lava flows remained contained within the crater.
The Argentine Geological and Mining Service (SEGEMAR) reported increased surface activity at the Planchón-Peteroa volcanic complex starting at 01:00 LT (04:00 UTC) on October 3, 2025, including emissions of fine volcanic ash rising up to 250 m (820 feet) above the crater. The technical alert remains at Yellow, with continued binational monitoring by SEGEMAR and Chile’s National Geology and Mining Service (SERNAGEOMIN).
Kanlaon volcano in Negros Island, Philippines, registered 176 shallow earthquakes on September 15, 2025, raising the risk of a steam-driven eruption. PHIVOLCS maintains Alert Level 2 but and urges communities to avoid the 4 km (2.4 miles) Permanent Danger Zone.
New activity/unrest was reported for 5 volcanoes from September 3 to 9, 2025. During the same period, ongoing activity was reported for 21 volcanoes.
Weak to moderate lahars descended from Fuego volcano, Guatemala, at 19:17 LT on September 10, 2025, moving through Barranca Ceniza and into the Zarco and Mazate rivers, tributaries of the Achíguate River. The National Institute of Seismology, Volcanology, Meteorology and Hydrology (INSIVUMEH) reported that conditions remain favorable for additional lahars on the southwestern flanks.
Multiple ash emissions were recorded at Kanlaon volcano, Philippines over the past couple of days, with ash rising up to 750 m (2 460 feet) above the summit. The volcano remains under Alert Level 2.
A large and impressive explosion occurred at Mexico's Colima volcano on Friday, February 3, 2017, producing an ash column that eventually rose up to 7.6 km (25 000 feet). The eruption occurred at 23:35 UTC (17:35 CST) and generated pyroclastic flow on the…
