Waterspout outbreak over western Lake Erie
At least 23 waterspouts were reported over western Lake Erie on September 7, 2025, with an additional four observed in surrounding areas, for a total of 27.
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Large landslide hits Cirque du Fer-à-Cheval, Haute-Savoie, France
A massive landslide released at least 12 000 m3 (424 000 ft3) of rock from 1 300 m (4 265 feet) altitude at Cirque du Fer-à-Cheval in Sixt-Fer-à-Cheval, Haute-Savoie, France, at 11:30 LT (09:30 UTC) on September 6, 2025. Expert analysis suggests the actual volume may reach 30 000–40 000 m3 (1.1–1.4 million ft3), making the event exceptional for this sector.
Lewotobi Laki-laki volcano alert raised to highest level, Indonesia
Indonesia’s Geological Agency raised the alert status of Mount Lewotobi Laki-laki in East Flores to Level IV (Awas) at 10:00 WITA on September 6, 2025, due to increased seismicity, continuous tremor, and deformation indicating shallow magma ascent.
CME impact and high-speed stream forecast to enhance geomagnetic activity through September 8
A large filament eruption was observed at 19:45 UTC on September 4, 2025, followed by at least three CMEs. Model runs suggest a likely arrival early on September 7. In addition, a recurrent positive polarity coronal hole high-speed stream (CH HSS) activity is expected to enhance solar wind parameters beginning early September 6, with G1 – Minor to G2 – Moderate geomagnetic storm conditions likely through September 8.
The Weekly Volcanic Activity Report: August 27–September 2, 2025
New activity/unrest was reported for 6 volcanoes from August 27 to September 2, 2025. During the same period, ongoing activity was reported for 23 volcanoes.
Hurricane Kiko forecast to bring dangerous surf and rip currents to Hawaii
Hurricane Kiko remains a strong category 3 system with maximum sustained winds of 205 km/h (125 mph), moving west at 15 km/h (9 mph). Swells from the storm are expected to reach the Hawaiian Islands late this weekend, producing life-threatening surf and rip currents.
Magma accumulation under Svartsengi nears eruption threshold, Iceland
Around 6 to 7 million m3 (212 to 247 million ft3) of magma have accumulated beneath Svartsengi, Iceland since the eruption on July 16, 2025. At the current rate of accumulation, the estimated threshold of 12 million m3 (424 million ft3) could be reached in the latter half of September, increasing the likelihood of a new eruption.
Moderate M5.9 earthquake hits Chile–Argentina border region
A moderate earthquake registered by the USGS as M5.9 hit the Chile–Argentina border region at 04:10 UTC on September 4, 2025. The agency reported a depth of 176 km (109 miles). EMSC is reporting the same magnitude and depth.
Shallow M6.0 earthquake hits Fox Islands, Alaska
A shallow earthquake registered by the USGS as M6.0 hit Fox Islands, Aleutian Islands, Alaska at 20:57 UTC on September 3, 2025. The agency is reporting a depth of 10 km (6.2 miles).
Cold front triggers severe weather and sharp cooling across parts of the Midwest
A strong cold front is sweeping southeast across the Great Lakes, Upper Midwest, and central Plains on September 3, 2025, bringing temperatures up to 25°C (45°F) below seasonal averages and triggering strong to severe thunderstorms.
