Etna (Sicily, Italy): (17 Aug) The effusive activity from the new vents at the southern base of the SE crater continues and has been gradually increasing over the past few days.
The lava flow front has now descended to approx. 2400 m elevation. After the first lava flow that had started on 10 Aug had ceased after a relatively modest lava output only, a new vent opened nearby on 14 Aug at around 2980 m elevation, on the southern slope between the Bocca Nuova and SE crater complex on 14 Aug, with a higher effusion rate. This vent has been feeding the active flow at the moment.
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Klyuchevskoy (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Anchorage warned about a volcanic ash plume that rose up to estimated 32000 ft (9800 m) altitude or flight level 320 and is moving at 25 kts in SE direction.
The full report is as follows: RESIDUAL VA EMISSIONS CONTINUE. to 32000 ft (9800 m)
Suwanose-jima (Ryukyu Islands): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTED AT 20250817/1952Z FL070 EXTD W OBS VA DTG:17/1950Z
Ibu (Halmahera, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION LAST REPORTED AT 17/1452Z EST VA DTG:17/1830Z
Lewotobi (Flores): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 32000 ft (9800 m) altitude or flight level 320 and is moving at 15 kts in W direction.
The full report is as follows: VA TO FL320 OBS AT 17/1700Z OBS VA DTG:17/1700Z to 32000 ft (9800 m)
Lewotolo (Lesser Sunda Islands): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION LAST REPORTED AT 17/0946Z EST VA DTG:17/1310Z
Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION REPORTED AT 17/1713Z EST VA DTG:17/1940Z
Dukono (Halmahera): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin 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: VA TO FL060 LAST REPORTED AT 17/0435Z OBS VA DTG:17/1710Z to 6000 ft (1800 m)
Katmai (Alaska Peninsula, USA): Volcanic Ash Advisory Center Anchorage (VAAC) issued the following report: VA NOT IDENTIFIABLE FM SATELLITE DATA.
Popocatépetl (Central Mexico): (17 Aug) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 22000 ft (6700 m) altitude or flight level 220 .
The full report is as follows: NEW VA EMS to 22000 ft (6700 m)
Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
The full report is as follows: NEW VA EMS to 14000 ft (4300 m)
Fuego (Guatemala): 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 to 15000 ft (4600 m)
Sangay (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
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: MINOR VA EMS to 15000 ft (4600 m)
Volcano Activity Summary for 17 Aug 2025:
