The Weekly Volcanic Activity Report: September 24-30, 2025
New activity/unrest was reported for two volcanoes from September 24–30, 2025. During the same period, ongoing activity was reported for 22 volcanoes.
Winter Weather Advisory issued for interior Alaska, Fairbanks records early-season snow
A Winter Weather Advisory is in effect for the Fairbanks area and interior Alaska, with up to 23 cm (9 inches) of snow accumulation forecast for some parts between Thursday and Friday night, October 2 and 3, 2025. This comes just a few days after the region tied its record for earliest freeze of the season, and began seeing snow 2 weeks ahead of average.
Dual lava fountains from Kīlauea’s Halemaʻumaʻu crater reach 400 m (1 300 feet), Hawaii
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.
Nearly two months’ worth of rain in 7 hours causes deadly flash floods in Odesa, Ukraine
A severe rainstorm dropped almost two months’ worth of rain in just seven hours over Odesa, Ukraine, triggering deadly flash floods across the city on September 30, 2025, causing at least nine fatalities.
Six homes destroyed by coastal flooding in Buxton, North Carolina
Dangerous coastal flooding from hurricanes Humberto and Imelda collapsed six oceanfront homes in Buxton, North Carolina, on September 30, 2025, with debris forcing beach closures and travel restrictions on NC12. Authorities warn of additional collapses as long-period swells continue.
Bermuda braces for Hurricane Imelda’s close approach
Bermuda is bracing for hurricane conditions and continued severe weather as Hurricane Imelda makes its way towards the island on October 1, 2025. Imelda and Humberto have claimed at least three lives so far as they continue to produce deadly rip currents and severe weather to Bermuda, the Bahamas, and much of the U.S. East Coast.
Coastal bluff collapse damages backyards in Rancho Palos Verdes, California
A section of coastal bluff measuring about 91–122 m (300–400 feet) collapsed in Rancho Palos Verdes, California, on September 28, 2025, falling 15–18 m (50–60 feet) toward the ocean. Four backyards were damaged, but no homes sustained structural damage, and no injuries were reported. Authorities said the collapse occurred outside the long-active Portuguese Bend Landslide Complex, located about 6 km (4 miles) away.
At least 69 dead after M6.9 earthquake hits Cebu and Leyte, central Philippines
A powerful M6.9 earthquake hit Cebu and Leyte, Philippines at 21:59 local time (13:59 UTC) on September 30, 2025, leaving at least 69 dead and more than 200 injured. Authorities reported extensive structural collapses in towns across Cebu and landslides and transport disruption in Leyte.
Imelda strenghtens into a hurricane after killing 2 in Cuba
Hurricane Imelda formed over the Atlantic on September 30, 2025, after 2 fatalities were confirmed in Cuba due to heavy rain and flooding in the Santiago de Cuba and Guantánamo. Imelda is now the fourth hurricane of the season, following Hurricane Humberto which continues to send dangerous rip currents to the U.S. East Coast.
Strong M6.0 earthquake hits Bali Sea, Indonesia
A strong and shallow earthquake registered by the USGS as M6.0 hit Bali Sea, Indonesia at 16:49 UTC on September 30, 2025. The agency is reporting a depth of 13.9 km (6 miles). EMSC is reporting M6.0 at a depth of 20 km (12.4 miles).
