Krakatau volcano (Indonesia) Nov 2018 eruption: a magic night on the island

The activity observed on 19 Nov continued in a more or less similar way during 20 Nov, although the frequency of explosions had decreased to typically 30 seconds to 1-2 minutes. As the size of explosions observed during the 36 hours we had been on the island group did not exceed a certain threshold (ejecting bombs to the sea), a part of our group decided to take the calculated risk and spend some time on a favorable viewing spot behind the forest and near the shore of Anak Krakatau.
When eruptions eventually started to increase significantly, we left.
Disclaimer: visiting such spots during eruptive phases of Krakatau is very risky and you should be aware that no place on the island of Anak Krakatau is safe from bombs - unexpected large explosions can occur with no warning at any time.
Beginning of an average-sized ash-rich explosion at sunset. (Photo: Tom Pfeiffer)
Beginning of an average-sized ash-rich explosion at sunset. (Photo: Tom Pfeiffer) [info]
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A similar, small vulcanian-type ash-rich explosion follows a few minutes later (sequence 1/3). (Photo: Tom Pfeiffer)
A similar, small vulcanian-type ash-rich explosion follows a few minutes later (sequence 1/3). (Phot... [info]
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A very large lava bomb, probably about 3 meter in diameter is ejected out above the eastern rim (sequence 2/3). (Photo: Tom Pfeiffer)
A very large lava bomb, probably about 3 meter in diameter is ejected out above the eastern rim (seq... [info]
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The bombs have mostly landed and a dense ash plume rises (sequence 3/3). (Photo: Tom Pfeiffer)
The bombs have mostly landed and a dense ash plume rises (sequence 3/3). (Photo: Tom Pfeiffer) [info]
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Sequence, taken split-seconds apart, of a lava-rich strombolian type explosion (1/4). (Photo: Tom Pfeiffer)
Sequence, taken split-seconds apart, of a lava-rich strombolian type explosion (1/4). (Photo: Tom Pf... [info]
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Lava-rich strombolian type explosion (2/4). (Photo: Tom Pfeiffer)
Lava-rich strombolian type explosion (2/4). (Photo: Tom Pfeiffer) [info]
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Lava-rich strombolian type explosion (3/4). (Photo: Tom Pfeiffer)
Lava-rich strombolian type explosion (3/4). (Photo: Tom Pfeiffer) [info]
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Lava-rich strombolian type explosion (4/4). (Photo: Tom Pfeiffer)
Lava-rich strombolian type explosion (4/4). (Photo: Tom Pfeiffer) [info]
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Many eruptions are much smaller, however. (Photo: Tom Pfeiffer)
Many eruptions are much smaller, however. (Photo: Tom Pfeiffer) [info]
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At the beginning of the blue hour, a very bright eruption occurs to the joy of every one. (Photo: Tom Pfeiffer)
At the beginning of the blue hour, a very bright eruption occurs to the joy of every one. (Photo: To... [info]
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The eruption now looks like a glowing wall of lava thrown into the air and falling back, (Photo: Tom Pfeiffer)
The eruption now looks like a glowing wall of lava thrown into the air and falling back, (Photo: Tom... [info]
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Red lava against the blue sky of the evening twilight. (Photo: Tom Pfeiffer)
Red lava against the blue sky of the evening twilight. (Photo: Tom Pfeiffer) [info]
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As the blue hour is over, the strong moonlight takes its place. (Photo: Tom Pfeiffer)
As the blue hour is over, the strong moonlight takes its place. (Photo: Tom Pfeiffer) [info]
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Ash plume rising from an explosion that just ended. (Photo: Tom Pfeiffer)
Ash plume rising from an explosion that just ended. (Photo: Tom Pfeiffer) [info]
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A few seconds later, another eruption occurs. (Photo: Tom Pfeiffer)
A few seconds later, another eruption occurs. (Photo: Tom Pfeiffer) [info]
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Rain of glowing bombs (Photo: Tom Pfeiffer)
Rain of glowing bombs (Photo: Tom Pfeiffer) [info]
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A very powerful (although comparably poor in incandescent material) explosion sends bombs to all over the cone. (Photo: Tom Pfeiffer)
A very powerful (although comparably poor in incandescent material) explosion sends bombs to all ove... [info]
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Mild strombolian eruption (Photo: Tom Pfeiffer)
Mild strombolian eruption (Photo: Tom Pfeiffer) [info]
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Moderate strombolian eruption (Photo: Tom Pfeiffer)
Moderate strombolian eruption (Photo: Tom Pfeiffer) [info]
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Strong strombolian eruption (Photo: Tom Pfeiffer)
Strong strombolian eruption (Photo: Tom Pfeiffer) [info]
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Very strong strombolian eruption... (Photo: Tom Pfeiffer)
Very strong strombolian eruption... (Photo: Tom Pfeiffer) [info]
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Fortunately, the increasing trend is broken by an "only" moderately-sized explosion following the previous one. (Photo: Tom Pfeiffer)
Fortunately, the increasing trend is broken by an "only" moderately-sized explosion following the pr... [info]
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Another moderately strong explosion, but with less incandescent lava (and better to photograph). (Photo: Tom Pfeiffer)
Another moderately strong explosion, but with less incandescent lava (and better to photograph). (Ph... [info]
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This eruption covered the eastern slope of the cone with incandescent material. (Photo: Tom Pfeiffer)
This eruption covered the eastern slope of the cone with incandescent material. (Photo: Tom Pfeiffer... [info]
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While this one throws most of the material onto the other (western) side of the cone. (Photo: Tom Pfeiffer)
While this one throws most of the material onto the other (western) side of the cone. (Photo: Tom Pf... [info]
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An ash-rich explosion observed with a wider angle lens. (Photo: Tom Pfeiffer)
An ash-rich explosion observed with a wider angle lens. (Photo: Tom Pfeiffer) [info]
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Silhouettes of the forest on the southern and eastern part of the island are visible in the lower right. (Photo: Tom Pfeiffer)
Silhouettes of the forest on the southern and eastern part of the island are visible in the lower ri... [info]
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A larger explosion covers the whole cone of Anak Krakatau with lava bombs. (Photo: Tom Pfeiffer)
A larger explosion covers the whole cone of Anak Krakatau with lava bombs. (Photo: Tom Pfeiffer) [info]
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A few minutes later, a stronger explosion occurs. (Photo: Tom Pfeiffer)
A few minutes later, a stronger explosion occurs. (Photo: Tom Pfeiffer) [info]
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A very strong explosion sends bombs into the forest. We get the suspicion that while the intervals between eruptions is becoming slightly larger (now sometimes up to 3-5 minutes rather than 10-20 seconds as earlier), also the size of explosions increases. We decide not to stay the whole night and leave our observation area, as it would be dangerous if the eruptions become even bigger... The following photos were taken within the next 1 hour. (Photo: Tom Pfeiffer)
A very strong explosion sends bombs into the forest. We get the suspicion that while the intervals b... [info]
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Shorter exposure with higher ISO setting (1600 ASA) the moment most of the material ejected by another explosion has fallen back. (Photo: Tom Pfeiffer)
Shorter exposure with higher ISO setting (1600 ASA) the moment most of the material ejected by anoth... [info]
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Almost all eruptions now are rather on the large side of the scale... (Photo: Tom Pfeiffer)
Almost all eruptions now are rather on the large side of the scale... (Photo: Tom Pfeiffer) [info]
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Beautiful symmetric eruption. (Photo: Tom Pfeiffer)
Beautiful symmetric eruption. (Photo: Tom Pfeiffer) [info]
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"Classic" strombolian eruption with lots of red hot lava. (Photo: Tom Pfeiffer)
"Classic" strombolian eruption with lots of red hot lava. (Photo: Tom Pfeiffer) [info]
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Eruption with (comparably) less bombs and more ash. (Photo: Tom Pfeiffer)
Eruption with (comparably) less bombs and more ash. (Photo: Tom Pfeiffer) [info]
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Lava watchers in position for the show. (Photo: Tom Pfeiffer)
Lava watchers in position for the show. (Photo: Tom Pfeiffer) [info]
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Wide-angle view of our observation spot with a large strombolian eruption occurring in the background. (Photo: Tom Pfeiffer)
Wide-angle view of our observation spot with a large strombolian eruption occurring in the backgroun... [info]
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For a while, activity returns to regular strombolian explosions at intervals of few minutes and moderate in size. (Photo: Tom Pfeiffer)
For a while, activity returns to regular strombolian explosions at intervals of few minutes and mode... [info]
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Strombolian eruption against a moonlit sky. (Photo: Tom Pfeiffer)
Strombolian eruption against a moonlit sky. (Photo: Tom Pfeiffer) [info]
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The first time, a small lightning is observed in the ash plume. In the following time, lightnings continue to occur occasionally, but much more rarely compared to the week before observed by the previous group. (Photo: Tom Pfeiffer)
The first time, a small lightning is observed in the ash plume. In the following time, lightnings co... [info]
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Moderately sized ash-rich eruption. (Photo: Tom Pfeiffer)
Moderately sized ash-rich eruption. (Photo: Tom Pfeiffer) [info]
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The strongest explosion makes us decide it is time to leave: in this 16mm ultra-wide angle photo, bombs can be seen flying outside the frame (upper left), clearly heading to land somewhere in the sea... (Photo: Tom Pfeiffer)
The strongest explosion makes us decide it is time to leave: in this 16mm ultra-wide angle photo, bo... [info]
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A last candle-like eruption before we return to camp and continue observations from a safer distance. (Photo: Tom Pfeiffer)
A last candle-like eruption before we return to camp and continue observations from a safer distance... [info]
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Typical strombolian eruption seen from the beach of Rakata. (Photo: Tom Pfeiffer)
Typical strombolian eruption seen from the beach of Rakata. (Photo: Tom Pfeiffer) [info]
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