Volcanic activity worldwide 28 Aug 2019: Stromboli volcano, Fuego, Popocatépetl, Krakatau, Shiveluc...

Stromboli (Eolian Islands, Italy): Following today's paroxysm, which surely has again significantly changed morphology of the crater terrace, a new lava flow started to descend on the upper Sciara del Fuoco from the NE vent area.
It probably started shortly or during the eruption at noon and seems to have increased a bit in the evening. Currently, its most advanced fronts seem to be about half way down the slope. Incandescent blocks detach from it and roll down towards the shore.
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A video of the Skyline webcam is now available showing the eruption earlier today, allowing to see that it consisted of a series of 4 separate explosions within few seconds:

...28 Aug:
Another major explosion has occurred at the volcano minutes ago at 12:18 local time.
Details are yet unclear, but from the image we received from Stromboli, it was another massive explosion from the summit vents, producing an ash plume that rose probably a few km, ejected bombs to the upper slopes of the volcano and caused a pyroclastic flow that traveled down the Sciara into the sea.
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It is not clear whether any appreciable precursors could be detected. Activity had been very high during the past weeks and the summit area was already closed, which hopefully prevented any injuries or worse. From webcam images, nothing very unusual could be detected in the minutes before, just a relatively strong (but not unusual) eruption from a vent in the northeastern crater at 11:55 local time.
In the eastern shore area of the island (Scari), centimeter-sized lapilli are falling.


Shiveluch (Kamchatka): (27 Aug) The recently reported eruption on 25 Aug alerting of an ash plume as high as 70,000 ft (21300 m) did not take place.
There is no data (satellite-based, direct observations etc) to confirm an eruption of this magnitude.
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The report was based on an erroneous alert from the Anchorage VAAC. An eruption did take place, observed by a group of people staying nearby and who sent us images on social media, but it was "only" producing an ash column rising approx. 23,000 ft (7 km) - something not unusual for Shiveluch which has been having eruptions of this size for decades at irregular intervals.


Sangeang Api (Indonesia): 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 and is moving at 10 kts in W direction.
The full report is as follows: INTERMITTENT DISCRETE EMISSIONS TO FL100 OBS VA DTG:28/1955Z to 10000 ft (3000 m)

Krakatau (Sunda Strait, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VONA FOR ERUPTION BASED ON SEISMIC DATA OBS VA DTG:28/1830Z

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 and is moving at 5 kts in NW direction.
The full report is as follows: CONTINUOUS VA EMISSIONS TO FL060 OBS VA DTG:28/2035Z to 6000 ft (1800 m)

Popocatépetl (Central Mexico): 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: CONS VA EMS. to 22000 ft (6700 m)

Fuego (Guatemala): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: POSS VA EM AT 28/1010Z

Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 24000 ft (7300 m) altitude or flight level 240 .
The full report is as follows: continuous ash emissions to 24000 ft (7300 m)

Volcano Activity Summary for 28 Aug 2019:

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