Shiveluch (Kamchatka): (21 Sep) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTION AT 20250921/2128Z FL140 EXTD W REPORTED OBS VA DTG:21/2120Z
Akan (Hokkaido): (22 Sep) Between 11 and 15 September, the Japan Meteorological Agency (JMA) reported increasing unrest within the Akan volcanic complex.
Starting around on 11 September, the number of small earthquakes near Ponmachineshiri Crater began to rise, reaching 19–50 events per day and remaining elevated throughout the week.
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Suwanose-jima (Ryukyu Islands): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTED AT 20250922/2014Z OVER FL070 STNR OBS VA DTG:22/2020Z
Ibu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 05 kts in SW direction.
The full report is as follows: VA TO FL070 LAST REPORTED AT 22/1512Z EST VA DTG:22/1600Z to 7000 ft (2100 m)
Lewotobi (Flores): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: VA TO FL150 OBS AT 22/0950Z MOV W OBS VA DTG:22/0950Z to 15000 ft (4600 m)
Lewotolo (Lesser Sunda Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 .
The full report is as follows: VA OBS TO FL070 AT 22/1930Z MOV NW OBS VA DTG:22/1930Z to 7000 ft (2100 m)
Semeru (East Java, Indonesia): (21 Sep) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: VA TO FL150 MOV NW OBS AT 21/2140Z OBS VA DTG:21/2140Z to 15000 ft (4600 m)
Lokon-Empung (North Sulawesi, Indonesia): (22 Sep) The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported ongoing unrest at Lokon-Empung during 10–16 September.
The seismic activity remained elevated throughout the week. White steam-and-gas plumes were observed daily, rising up to 150 m above the rim of Tompaluan Crater and dispersing in multiple directions.
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Katmai (Alaska Peninsula, USA): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Anchorage warned about a volcanic ash plume that rose up to estimated 6000 ft (1800 m) altitude or flight level 060 .
The full report is as follows: NO ERUPTION. VA RESUSPENSION. to 6000 ft (1800 m)
Popocatépetl (Central Mexico): (22 Sep) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 .
The full report is as follows: VA EMS OBS to 20000 ft (6100 m)
Fuego (Guatemala): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 21000 ft (6400 m) altitude or flight level 210 .
The full report is as follows: VA EMS OBS to 21000 ft (6400 m)
Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: FRQT VA EMS CONT to 15000 ft (4600 m)