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Anak Krakatau eruption 2007: mostly ash - ash venting and powerful ash plumes

The most frequent type of activity was ash venting, occuring at intervals of typically 2 minutes, but the resulting plumes were relatively low ash clouds. Some of the more powerful explosions produced tall plumes of over 1 km height.

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Ash venting: this was the most frequent type of activity we observed during our expedition. Such emissions of dense billowing ash clouds were occurring at very regular intervals of approximately 2 minutes. These are probalbly related to deep-seated explosive phreatomagmatic activity. (c)
Ash venting: this was the most frequent type of activity we observed during our expedition. Such emi...
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Typical ash venting from the new crater. (c)
Typical ash venting from the new crater. (c)
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Regular pulses of ash create a series of ash plumes all drifting in the same direction eastward. (c)
Regular pulses of ash create a series of ash plumes all drifting in the same direction eastward. (c)
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Normal ash venting at dawn of 25 November. (c)
Normal ash venting at dawn of 25 November. (c)
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Sunset light over the caldera. Weak ash plumes drift in succession over to the east. (c)
Sunset light over the caldera. Weak ash plumes drift in succession over to the east. (c)
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Ash rich explosion early on 22 Nov. (c)
Ash rich explosion early on 22 Nov. (c)
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Weak explosions and near-continuous spattering from the vent in the lower left of the crater; only minor amounts of ash are produced. (22 Nov evening) (c)
Weak explosions and near-continuous spattering from the vent in the lower left of the crater; only m...
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23 Nov evening: the usual thunderstorms over Sumatra illuminate the sky to the west while Krakatau is venting ash. (c)
23 Nov evening: the usual thunderstorms over Sumatra illuminate the sky to the west while Krakatau i...
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(c)
(c)
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24 Nov evening: thick ash plumes rising to more than 1 km. (c)
24 Nov evening: thick ash plumes rising to more than 1 km. (c)
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(c)
(c)
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(c)
(c)
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(c)
(c)
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23 Nov evening: thick ash plumes rise from the eruptions under a full-moon sky. (c)
23 Nov evening: thick ash plumes rise from the eruptions under a full-moon sky. (c)
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Wind picks up and blows the ash clouds over the top of Anak Krakatau. (c)
Wind picks up and blows the ash clouds over the top of Anak Krakatau. (c)
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Finally, the light is off... (c)
Finally, the light is off... (c)
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