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.
Axial Seamount, an underwater volcano off the Pacific Northwest coast, could erupt soon for the first time in a decade. Scientists at the University of Washington have detected a sharp increase in small undersea earthquakes and seafloor inflation — signs of magma buildup within the volcano. Despite the activity, experts say there is no threat to coastal communities. The site remains under constant observation through one of the world’s most advanced ocean monitoring systems.
Lava fountains reached 215 m (700 feet) at Kilauea volcano on Tuesday, April 1, 2025, during episode 16 of the ongoing Halemaʻumaʻu eruption.
Volcanic unrest continues at Mount Spurr, Alaska, with elevated seismic activity, surface deformation, persistent gas emissions, and visible summit steaming. The current unrest indicates that new magma has intruded into the Earth’s crust beneath the volcano and that the probability of an eruption has increased. The last known eruption at this volcano took place in 1992 (VEI 4).
The likelihood of an eruption at Mount Spurr has increased with gas emissions recorded on March 7 and 11, confirming ongoing volcanic unrest. The volcano is located about 120 km (75 miles) west of Anchorage (population 286 000), Alaska.
A small explosive event was recorded at the Atka volcanic complex in the Aleutian Islands, U.S., at 19:26 LT on February 20, 2025 (04:26 UTC on February 21). The Aviation Color Code has been raised to Orange and Alert Level to Watch.
Mount Spurr in Alaska remains in a state of volcanic unrest, with AVO detecting numerous shallow earthquakes on February 13, 2025, likely caused by magma movement beneath the volcano. While an eruption is not expected in the near term, ongoing activity suggests one could occur in the future, most likely at Crater Peak, which erupted explosively in 1953 and 1992.
New research has found magma reservoirs beneath dormant volcanoes in the Cascade Range remain intact for thousands of years, challenging the long-standing belief that magma bodies dissipate over time after eruptions and reshaping understanding of volcanic activity. Previously, large magma bodies were thought to indicate an increased likelihood of eruption, but the study suggests they are a persistent feature of volcanic systems rather than a sign of imminent activity.
