Volcanic activity worldwide 4 Dec 2023: Santiaguito volcano, Fuego, Popocatépetl, Merapi, Semeru, S…

Map of today’s active volcanoes

Shiveluch (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.

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 .
The full report is as follows: VA TO FL070 MOV ENE OBS AT 04/1700Z OBS VA DTG:04/1700Z to 7000 ft (2100 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 6000 ft (1800 m) altitude or flight level 060 .
The full report is as follows: VA TO FL060 MOV NW REPORTED AT 04/0918Z OBS VA DTG:04/0930Z to 6000 ft (1800 m)

Merapi (Central Java, Indonesia): A massive eruption occurred at the volcano late afternoon today.
At around 17:36 local time, a large hot avalanche, known as pyroclastic flow, descended from the active lava dome at the summit crater.
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The extremely dangerous, fast-moving turbulent flow consists of a mixture of hot rock fragments of the lava dome, volcanic gasses and ambient air. It traveled through the Kali Boyong ravine on the southern flank and reached a distance of estimated 1.2 km distance from the summit. It also produced massive grey ash-abundant plumes, so-called phoenix clouds, separating from the block-and-ash flow.
Pyroclastic flows are typically formed when the accumulated lava masses at the summit crater, known as the lava dome, become too large and suffer smaller or larger gravitational collapse, which then turn into fast and deadly avalanches as they destroy and burn everything in their path.

Semeru (East Java, Indonesia): (3 Dec) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin 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: VA TO FL140 REPORTED MOV W AT 03/2130Z EST VA DTG:03/2130Z to 14000 ft (4300 m)

Marapi (Western Sumatra, Indonesia): (4 Dec) The explosive eruption at the volcano continues.
It seems that yesterday’s massive eruption triggered a new eruptive period at the volcano as another explosion occurred this morning.
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At 08:22 local time, vulcanian-sized explosion generated a thick grey-to-black ash column spewing pyroclastic material to estimated 3700 meters altitude towards the southwest. Recent eruptions from Marapi might be found as phreatic, i.e. when the ejecta consists solely of old country rock, indicating interaction between water and heated conduit-rocks rather than new magma itself, although this information has to be confirmed or refuted by the observatory.
The PVMBG volcano observatory reported a seismic signal with a maximum amplitude of 30 mm and a duration of 68 seconds.

Popocatépetl (Central Mexico): 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: CONS VA EMS. to 21000 ft (6400 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: OCNL EM 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: OCNL VA EMS. to 15000 ft (4600 m)

Nevado del Ruiz (Colombia): 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 and is moving at 10 kts in W direction.
The full report is as follows: CONS EM OF GASES AND LGT VA to 20000 ft (6100 m)

Sangay (Ecuador): 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: OCNL EM to 20000 ft (6100 m)

Reventador (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: OCNL EM

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 10 kts in E direction.
The full report is as follows: INT STRONG EMS to 27000 ft (8200 m)

Volcano Activity Summary for 4 Dec 2023:

Satellite image of Shiveluch volcano on 4 Dec 2023