The Weekly Volcanic Activity Report: October 1-7, 2026
New activity/unrest was reported for 8 volcanoes from October 1-7, 2026. During the same period, ongoing activity was reported for 16 volcanoes.
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New activity/unrest was reported for 8 volcanoes from October 1-7, 2026. During the same period, ongoing activity was reported for 16 volcanoes.
New activity/unrest was reported for 7 volcanoes from September 24 to 30, 2026. During the same period, ongoing activity was reported for 18 volcanoes.
A strong and shallow earthquake registered by the USGS as M6.6 hit the Loyalty Islands, New Caledonia at 21:23 UTC on September 25, 2026. The agency is reporting a depth of 10 km (6.2 miles). EMSC is reporting the same magnitude and depth. According to the NWS Pacific Tsunami Warning Center (PTWC), there is no tsunami threat from this earthquake.
Tropical Storm Polo was rapidly intensifying off southwestern Mexico on September 21, 2026, with maximum sustained winds reaching 100 km/h (65 mph) at 09:00 CST (15:00 UTC), according to the National Hurricane Center (NHC). NHC forecasts Polo to become a hurricane later Monday and a major hurricane on Tuesday while moving near the southwestern Mexican coast, where a Tropical Storm Watch is already in effect.
Asteroid 2026 SZ2 passed Earth at 0.055 lunar distances (about 0.000141 AU / 21 100 km / 13 100 miles) from the center of our planet at 21:19 UTC on September 20, 2026. Its closest point was approximately 14 800 km (9 200 miles) above Earth’s surface, placing the asteroid well inside the orbit of geostationary satellites.
A strong earthquake registered by the USGS as M6.4 hit the Eastern New Guinea region of Papua New Guinea at 09:17 UTC (19:17 LT) on September 20, 2026. The agency is reporting a depth of 104.3 km (64.8 miles). EMSC is reporting M6.4 at a depth of 104 km (64.6 miles).
New activity/unrest was reported for 1 volcano from September 10 to 16, 2026. During the same period, ongoing activity was reported for 18 volcanoes.
The 2025 Antarctic ozone hole recorded the fourth-smallest average ozone mass deficit since 1992, according to the 2026 Antarctic assessment. The World Meteorological Organization (WMO) reported a maximum ozone mass deficit of 36.7 million tons on September 29, more than 25% below the 1990–2010 mean of 50.1 million tons. The weak season fits the long-term ozone recovery trend, while year-to-year atmospheric variability remains large.
A strong earthquake registered by the USGS as M6.5 hit the Fox Islands region of the Aleutian Islands, Alaska at 14:19 UTC (06:19 LT) on September 17, 2026. The agency is reporting a depth of 114.8 km (71.3 miles). EMSC is reporting M6.5 at a depth of 106 km (65.9 miles). According to the NWS National Tsunami Warning Center (NTWC), a tsunami is not expected.
Heavy rainfall and repeated thunderstorms are raising the flash-flood threat across Arizona on September 16, 2026, with the Weather Prediction Center (WPC) placing parts of southern and central Arizona under a Moderate Risk of excessive rainfall. Flood Watches cover much of the state, while National Weather Service (NWS) offices warn that burn scars, slot canyons, and already saturated ground require particular attention during periods of heavy rainfall.