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.
Flash floods hit Charleston, South Carolina on September 7, 2025, after thunderstorms dropped heavy rainfall on already saturated ground. Up to 30 cm (12 inches) of standing water was reported in parts of downtown Charleston, with traffic and power disruptions affecting the city.
Carbon dioxide fluxes at Vulcano volcano, Aeolian Islands, Italy, sharply increased in August 2025, reaching more than 40 000 g/m²/day on August 18, before stabilizing around 30 000 g/m²/day.
Tropical Storm Tapah prompted the T8 warning in Hong Kong at 21:20 LT (13:20 UTC) on September 7, 2025, with gale-force winds of 63 km/h (39 mph) or above forecast to persist into September 8.
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.
A tornado touched down near Holden on Saturday afternoon, September 6, 2025, causing widespread damage in the area and surrounding regions, as it downed tree and power lines.
Hurricane Kiko remains a Category 3 system in the central Pacific, forecast to pass north of Hawaii early next week while generating hazardous surf and rip currents from Sunday onward. A statewide State of Emergency was declared on September 5 to prepare for potential impacts.
Northern Sichuan recorded its most intense rainfall of 2025 on September 5, with 12-hour accumulations exceeding 250 mm (10 inches) in Guangyuan and Nanchong, and a provincial maximum of 255.2 mm (10 inches) in Chaotian District. The rainfall triggered flash flooding, street inundations, and emergency responses across multiple districts in Guangyuan and Nanchong.
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.
Tropical Storm Peipah made landfall in Kochi Prefecture, Japan, around 01:00 JST on Friday, September 5, 2025, bringing strong winds and heavy rainfall across multiple regions. The storm injured at least 24 people and damaged or destroyed several homes. Authorities issued evacuation orders for more than 600 000 residents.
