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Anak Krakatau volcano (Indonesia): growing lava dome

Wednesday Mar 28, 2012 17:49 PM | BY: T

The growing lava dome inside Anak Krakatau's summit crater on 26 March 2012 (photo: Andi Rosati / VolcanoDiscovery)
The growing lava dome inside Anak Krakatau's summit crater on 26 March 2012 (photo: Andi Rosati / VolcanoDiscovery)
The glow from Anak Krakatau seen at night from Rakata Island (26 March, photo: Andi)
The glow from Anak Krakatau seen at night from Rakata Island (26 March, photo: Andi)
Seismic signals recorded on 26 March
Seismic signals recorded on 26 March
An active lava dome is growing inside the summit crater of Krakatau volcano. Our tour expedition leader Andi just returned from a visit and reports that the dome is now about 100 m wide, and has 2 main active vents that eject jets of incandescent gas.
At night, the glow from the dome is clearly visible from Rakata and Sertung islands, and a continuous intense solfatara plume is rising about 500 m above the summit. Andi and our group observed also that there are now more and larger fumarole fields on the southern part of the cone. According to our observations and the opinion of local scientists, this area is inflated due to the pushing of the lava dome.
The seismic recordings from the observatory of Krakatau also show an increase in activity. On 26 March, there were 138 volcanic-tectonic (A-type) earthquakes and 300 long-period (B-type) quakes alone.
The question is how long the lava dome remains quiet and purely effusive in style. Explosive, also larger vulcanian-type ones, activity could occur any time.
Previous news
Thursday, Mar 22, 2012
A relatively quiet week of volcanic activity has passed and as on every Thursday, the new Smithsonian / USGS Weekly Volcanic Activity Report is issued. It is summarized as follows: ... [more]
Thursday, Mar 15, 2012
The new Smithsonian / USGS Weekly Volcanic Activity Report summarized: ... [more]
Monday, Mar 12, 2012
A technically minor, but visually obvious design change was just implemented,- everything stays the same, but we thought to add a picture to the top... I hope you like the change! ... [more]
Thursday, Mar 08, 2012
The new Smithsonian / USGS Weekly Volcanic Activity Report summarized: ... [more]

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