Volcanic activity worldwide 17 Aug 2023: Santiaguito volcano, Fuego, Ibu, Dukono, Torfajökull, Reve…

Map of today’s active volcanoes

Askja (Central Iceland): (17 Aug) The inflation at the volcano continues.
InSAR (interferometric synthetic-aperture radar) monitorings of the volcano consider the central part of the caldera (western-southwestern outer part of the Viti crater) the most uplifted during the July 2021-August 2023 period.
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A source of magma remains unchanged at 3 km depth, and according to geodetic measurements, there are no indications of magma reaching shallower levels.
Currently, the IMO scientists have been doing field research to measure gas, temperature and pH values located in the Öskjuvatn lake. These long-term measurements are taken to detect changes in the activity of the volcano.

Torfajökull (Iceland): (17 Aug) The latest ground deformation measurements from June revealed an uplift of the volcano.
The central part of the caldera has been inflated by a few centimeters as visible in both InSAR and GPS data. This is presumably reflecting continued magma accumulation under the surface.
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No significant seismic changes have occurred since the beginning of the uplift so far.
The Torfajökull central volcano, located north of Myrdalsjökull and south of Thorisvatn lake, consists of the largest area of silicic and intermediate volcanism in Iceland. During postglacial times only a narrow fissure zone at the western end has been active, producing mostly silicic lava flows, lava domes, and tephras. The most recent silicic eruption produced the Hrafntinnuhraun lava flow about 900 AD. The fissure system is along trend with and was active at the same time as the basaltic Veidivötn fissure system of Bárdarbunga central volcano in 1477 AD. The small Torfajökull icecap lies mostly outside the SE rim of the caldera, which is the site of vigorous thermal activity over a broad area of 130-140 sq km.

Mayon (Luzon Island, Philippines): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTION AT 20230817/1330Z VA CLD UNKNOWN REPORTED OBS VA DTG:17/1330Z

Bagana (Bougainville Island, Papua New Guinea): (16 Aug) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 10000 ft (3000 m) altitude or flight level 100 .
The full report is as follows: VA EMISSION TO FL010 MOV W OBS VA DTG:16/2150Z to 10000 ft (3000 m)

Ibu (Halmahera, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: DISCRETE VA REPORTED TO FL080 MOV N AT 17/0953Z

Sinabung (Sumatra, Indonesia): (17 Aug) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA EMISSION TO FL180 MOV W EST VA DTG:17/0710Z

Lewotolo (Lesser Sunda Islands): (17 Aug) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION TO FL070 MOV NE EST VA DTG:17/0450Z

Dukono (Halmahera): (16 Aug) 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: CONTINUOUS VA EMISSION TO FL070 MOV NE OBS VA DTG:16/2310Z to 7000 ft (2100 m)

Shishaldin (Aleutian Islands, Alaska): (17 Aug) The Alaska Volcano Observatory (AVO) reported that the recent eruptive episode decreased some time during 15 August.
The seismic activity declined. Neither significant explosions nor ash emissions are no longer detected.
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The volcano has been only steaming since last morning.
Satellite views depict a sustained thermal anomaly at the summit, indicating the presence of hot volcanic material.

Santiaguito (Guatemala): Mild explosive activity continues from the volcano. The Volcanic Ash Advisory Center (VAAC) Washington reported intermittent emissions of volcanic ash plumes.
The full report is as follows: sporadic emissions of volcanic ash

Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 17000 ft (5200 m) altitude or flight level 170 .
The full report is as follows: VA EM CONT to 17000 ft (5200 m)

Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 23000 ft (7000 m) altitude or flight level 230 and is moving at 5 kts in W direction.
The full report is as follows: VA EM CONT to 23000 ft (7000 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: PSBL VA EMS. to 15000 ft (4600 m)

Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 27000 ft (8200 m) altitude or flight level 270 and is moving at 25 kts in N direction.
The full report is as follows: continuous ash emissions to 27000 ft (8200 m)

Ubinas (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 23000 ft (7000 m) altitude or flight level 230 and is moving at 20 kts in NE direction.
The full report is as follows: continuous ash emissions to 23000 ft (7000 m)

The uplift at Askja volcano continues. yellow-to-orange and red areas represent the most inflated area (image: IMO)