Andi sent the following impressions:

Kelut volcano (East Java, Indonesia): eruption update - 4 fatalities, new size estimates

Additional details and new estimates about the recent explosion are emerging. Unfortunately, a 4th fatality caused by the eruption has now been confirmed by BNPB. All victims were within 7 km of the volcano. More than 100,000 people have been evacuated.
Fast rise of magma?
One of the most remarkable aspects of the eruption was how quickly it built up, suggesting a very fast rise of magma occurred in the hours before the explosion. VSI mentioned that there were only 2 hours between the appearance of shallow earthquakes (the typical immediate precursors) and the onset of the eruption itself. With such little warning time, it was difficult to implement an effective evacuation, but still, one should recognize that Indonesian authorities have done a marvelous job. Still, it is a small wonder that there were not many more fatalities. Most of this is to be attributed to the fact, that the eruption seems not to have produced any or at least no larger pyroclastic flows (which in itself is also a small wonder).

New estimates of the size of the eruption
The latest estimates of the erupted tephra volume are in the range of 120-140 million m3, which puts the explosion into the subplinian category with a low 4 on the Volcanic Explosivity Index scale (VEI). The plume seems to have reached up to 20 km altitude, analysis of satellite data suggest. These values put the eruption to be the largest in recent years, since the 2010 eruption of Puyehue-Cordon Caulle in Chile.
The explosion produced also one of the largest-ever recorded volcano-related infrasound waves. The pressure waves were picked up by stations all over the world, the furthest one being IS53 in Fairbanks, Alaska at >11.000 km or >6.800 mls, and the calculated traces point all into the direction of Kelut.

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Kelud volcano (East Java, Indonesia) activity update

Ash from the eruption is still drifting over the eastern Indian Ocean. More than 100,000 people have reportedly evacuated areas close to the volcano. Heavy ash fall occurred in vast areas of Java. A preliminary judgement of the erupted ash suggests that the explosion was a magmatic event, i.e. triggered by a new bash of fresh magma that seems to have risen very quickly to the surface:

Our correspondent Andi wrote: "Jogja and many cities in the west and east of Java is covered by raining ash and layered until 3-4 mm. It's terrible that the ash could reach Jogja and other cities until 500 km away from Kelud as well as covered Borobudur temple again as in eruption 2010. ... The color (of the ash, rmk) is white powder and some black particles inside as well that maybe there is some pyroxene (small black particles)."

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Kelut volcano (East Java, Indonesia): eruption update - 3 fatalities confirmed, evacuations

BNPB (Civil protection) confirmed 3 fatalities (indirectly or directly) caused by the eruption: two as result of breathing difficulties caused by the ash, one as a road accident during evacuation. All of the victims were in Pandasari village less than 7 km from the volcano where 20 cm of ash has fallen.
So far, 76,388 people are confirmed evacuated into 293 shelters so far, while evacuation efforts within the 10 km exclusion zone continue.
Preliminary estimations are that the eruption produced 80 million cubic meters of tephra. At the moment, the volcano continues to emit ash and steam, accompanied by tremors. The government of East Java has declared the state of emergency for the affected area. 350,000 dust masks are being distributed.

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• UPDATE KELUD: 3 TEWAS DAN 76.388 JIWA MENGUNGSI DARI ERUPSI KELUD (BNPB)