The Weekly Volcanic Activity Report: July 2–8, 2025
New activity/unrest was reported for 3 volcanoes from July 2 to 8, 2025. During the same period, ongoing activity was reported for 18 volcanoes.
I'm a dedicated researcher, journalist, and editor at The Watchers. With over 20 years of experience in the media industry, I specialize in hard science news, focusing on extreme weather, seismic and volcanic activity, space weather, and astronomy, including near-Earth objects and planetary defense strategies. You can reach me at teo /at/ watchers.news.
Glacial outburst flood developing at Mýrdalsjökull, Iceland
A glacial outburst flood has been developing in the Leirá syðri and Skálm rivers, southern Iceland, following rising water levels and electrical conductivity measured since July 7, 2025. Conditions continued to intensify as of 15:00 LT on July 9.
Wildfire injures more than 110 and damages dozens of homes near Marseille, France
More than 110 people were injured and at least 10 homes destroyed as a wildfire spread into the northern districts of Marseille, France, on July 8 and 9, 2025. The fire forced evacuations, grounded flights at the city’s airport, and damaged critical infrastructure during intense summer heat and strong winds.
Fatalities and severe structural damage reported after M5.7 earthquake in Guatemala
A shallow earthquake registered by the USGS as M5.7 hit southern Guatemala at 21:41 UTC (15:41 local time) on July 8, 2025. The agency is reporting a depth of 10 km (6.2 miles). Preliminary reports indicate at least 6 fatalities and more than 7 injuries, with dozens of homes sustaining severe structural damage.
Shallow seismic swarm underway in the Michoacán–Guanajuato Volcanic Field, Mexico
More than 440 earthquakes have been recorded since June 17, 2025, within the Michoacán–Guanajuato Volcanic Field, specifically in the Tancítaro–Parícutin region of Michoacán, Mexico, in an ongoing seismic swarm associated with magmatic activity. The last eruptive period in the field occurred from 1943 to 1952 (VEI 4).
Earthquake swarm detected beneath Mount Rainier, Washington
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.
Strong winds drive wildfire near Les Pennes–Mirabeau, halting air traffic in Marseille, France
Strong winds drove a fast-moving wildfire near Les Pennes–Mirabeau, north of Marseille, forcing the shutdown of Marseille–Provence Airport around midday local time on July 8, 2025. The fire burned approximately 30 ha (74 acres), prompted evacuations, and spread smoke across the city’s northern districts.
M2.4 solar flare erupts from the northeast limb
After 18 days with no notable flaring, our star unleashed an M2.4 solar flare from an emerging region on the northeast limb. The flare began at 03:42, peaked at 04:17 and ended at 04:37 UTC.
Strong and shallow M6.3 earthquake hits near South Island, New Zealand
A strong and shallow earthquake registered by the USGS as M6.3 hit near the southern coast of South Island, New Zealand at 12:53 UTC on July 7, 2025. The agency is reporting a depth of 10 km (6.2 miles). GeoNet is reporting M6.1 at a depth of 12 km (7.5 miles).
Major eruption at Mount Lewotobi Laki-laki sends ash to 19.6 km, triggers ashfall in nearby villages, Indonesia
A major explosive eruption occurred at Mount Lewotobi Laki-laki, Indonesia, on July 7, 2025, producing an ash column that rose to over 19 km (63 000 feet) above sea level (a.s.l.). The Aviation Color Code was raised to Red, resulting in the cancellation of multiple flights to and from Bali. Heavy ashfall is falling over the nearby villages.
