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.
Episode 34 of the ongoing Kīlauea eruption ended at 07:03 HST (17:03 UTC) on October 1, 2025, after 6 hours of lava fountaining from two vents in Halemaʻumaʻu crater at the volcano’s summit, Hawaii. Lava fountains reached up to 400 m (1 300 feet), erupting about 9 million m³ of lava at a peak effusion rate of 500 yd³/s. The eruption filled much of the western crater floor before activity ceased.
A new eruptive episode started at Kīlauea’s Halemaʻumaʻu crater at 13:11 UTC (03:11 HST) on September 19, 2025, producing lava fountains over 150 m (500 feet) and a volcanic plume up to 3 000 m (10 000 feet) high. The eruption remains confined to the summit caldera within Hawaiʻi Volcanoes National Park.
Kīlauea summit, Hawaii, is showing strong gas pistoning and overflows ahead of the next eruptive episode, with Pele’s hair and volcanic gas already affecting the summit area and nearby communities. The Hawaiian Volcano Observatory (HVO) warns that episode 33 lava fountaining is expected to begin over the next 1 to 3 days.
Episode 32 of the Halemaʻumaʻu eruption at Kīlauea volcano, Hawaii, began at 16:35 UTC (06:35 HST) on September 2, 2025, producing lava fountains up to 150 m (500 feet) high. The eruption remains confined to the summit crater within Hawai‘i Volcanoes National Park.
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.
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 swarm of hundreds of small earthquakes was detected beneath the summit of Mount Rainier, Washington, starting at 01:29 LT (08:29 UTC) on July 8, 2025, prompting increased monitoring by the USGS Cascades Volcano Observatory and the Pacific Northwest Seismic Network.
Increased seismic activity was detected at Iliamna Volcano, Alaska, starting around 12:30 UTC (04:30 local time) on June 15, 2025, with earthquakes occurring up to several times per minute before declining to about one per minute.
Episode 23 of the Halemaʻumaʻu eruption at Kīlauea volcano, Hawaiʻi, began at 16:15 HST on May 25, 2025, with lava fountains exceeding 300 m (1 000 feet) from the north vent.
