The Weekly Volcanic Activity Report: January 29 – February 4, 2025
New activity/unrest was reported for 5 volcanoes from January 29 – February 4, 2025. During the same period, ongoing activity was reported for 21 volcanoes.
Heavy rains set new records in San Francisco, triggering floods and landslides, California
Two atmospheric rivers have battered the U.S. West Coast since January 31, 2025, bringing record rainfall to San Francisco and triggering landslides and flooding across California. At least one person was hospitalized.
Effusive eruption at Stromboli volcano, lava flowing down Sciara del Fuoco, Italy
Effusive lava activity has been observed with lava overflowing from the northern summit area at Stromboli volcano, Italy since 07:08 LT (06:08 UTC) on February 6, 2025. The Aviation Color Code remains at Orange.
Earthquake swarm recorded in Campi Flegrei, Italy
An earthquake swarm began in the Campi Flegrei area of southern Italy at 08:03 LT (07:03 UTC) on February 5, 2025.
Back-to-back winter storms to impact U.S. Midwest and Northeast
Two winter storms are set to sweep across the U.S. Midwest, Great Lakes, and Northeast starting February 5, 2025, impacting millions with power outages and treacherous icy roads, prompting several Ice Storm Warnings and Winter Weather Warnings.
Strong M6.0 earthquake strikes near the coast of North Maluku, Indonesia
A strong earthquake registered by the BKMG as M6.0 hit near the coast of North Maluku, Indonesia, at 03:12 UTC (10:12 LT) on February 5, 2025. The agency is reporting a depth of 87 km (54 miles). USGS reported a slightly lower magnitude of 5.5 with a depth of 104 km (65 miles).
Increased activity at Bezymianny volcano, Russia
An eruption at Bezymianny volcano in Kamchatka, Russia, sent ash up to 4 km (13 123 feet) a.s.l. and triggered seismic activity at 10:20 LT (00:20 UTC) on February 1, 2025. KVERT raised the Aviation Color Code to Orange on January 31, marking the first upgrade in three months since October 4, 2024.
Japan sets new national 12-hour snowfall record with 1.29 m (4 feet) in Hokkaido
A record-breaking 1.29 m (4 feet) of snow fell in Obihiro, Japan, within just 12 hours on February 4, 2025, setting a new national record for 12-hour snowfall and leaving cars stranded in deep snow.
Rare polar vortex split forecast for February 2025 could bring prolonged cold to North America
A significant cold outbreak is forecast for mid-February 2025 as a Sudden Stratospheric Warming (SSW) event splits the polar vortex, with one of its cores expected to move into North America.
Over 9 000 people evacuate Santorini as seismic crisis worsens, UK issues travel advisory, Greece
Over 9 000 residents and tourists evacuated Santorini island by ferry and emergency flights on February 3 and 4, 2025, following a surge in seismic activity that began on January 28. Authorities remain on high alert as the region continues to experience strong earthquakes, including 43 tremors above M4.0 since February 1.
