Home Reef volcano re-emerged above sea level on September 9, 2022, prompting authorities in Tonga to issue a Hazard Alert to all marines to sail at least 5 km (3.1 miles) away from the volcano. The volcano is located midway between Metis Shoal and Late Island in the central Tonga islands. It was first reported active in the mid-19th century when an ephemeral island formed.
A seismic swarm started in under the Laguna del Maule volcanic complex in Chile on October 1, 2022.
Ash emissions at Nishinoshima volcano, Japan increased on October 2 and 3, 2022, after more than 12 months of relative quiescence.
Indonesian PVMBG is reporting increased activity under the Sorikmarapi stratovolcano, North Sumatra, Indonesia. The last eruption at this volcano took place in 1986 (VEI 1).
More than 2 600 sinkholes have been identified in Konya Plain, Anatolia, Turkey, as of September 27, 2022. At the end of 2021, there were over 2 500 sinkholes, of which around 700 were deeper and 1 800 less than 1 m (3.3 feet) in depth.
A strong and shallow earthquake, registered by the BMKG as M6.0, hit northern Sumatra at 19:28 UTC on September 30, 2022. The agency is reporting a depth of 10 km (6.2 miles). USGS is reporting M5.9 ad a depth of 13.2 km (8.2 miles); EMSC M5.8 at a depth of 40 km (25 miles).
A major explosion took place at Stromboli volcano, Italy 13:24 UTC on September 29, 2022, from its North crater area.
The swarm of earthquakes that began on August 24, 2022, beneath Trident stratovolcano, Alaska, U.S. continues. The last eruption of this volcano took place in 1974 (VEI 3).
New activity/unrest was reported for 4 volcanoes from September 21 to 27, 2022. During the same period, ongoing activity was reported for 17 volcanoes.
A strong and shallow earthquake, registered by the USGS as M6.5, hit east of the South Sandwich Islands at 03:03 UTC on September 29, 2022. The agency is reporting a depth of 10 km (6.2 miles). EMSC is reporting M6.7 at a depth of 2 km (1.2 miles).