Anak Krakatau volcano (Indonesia), activity update: lava dome has disappeared, new hydrothermal vents
Samstag Jul 07, 2012 16:31 | VON: T
The collapse pits at the site of the 2012 lava dome in the western part of the summit crater of Krakatau (2 July 2012)
During our recent expedition to Krakatau volcano, we could no longer see the lava dome active during Feb-May this year. Probably, the magma column had dropped in mid to late May and the dome collapsed. At its place, there were only 2 collapse pits, very hot ground and intense degassing from numerous fumaroles inside and outside of the now large summit crater.
One of the new areas with shallow submarine hydrothermal activity on the western shore of Anak Krakatau, causing an intense orange water stain (2 July 2012)
Seismic activity when visiting the local volcano observatory was at very low levels, suggesting that Anak Krakatau is at the moment in a phase of repose.
Interestingly, a number (at least 4) areas with apparent submarine hydrothermal iron-bearing vents were observed that had not been there last year. In these areas, bubbling could be seen in the water, and where accessible, iron-rich greenish warm mud was found at the sea floor, which oxidized to orange when brought to the surface. The sea water around these areas had an intense yellow stain. Very similar submarine activity is known from around Nea Kameni island, Santorini.
Mittwoch, Mai 30, 2012
Our group to Krakatau during 13-14 May observed a new little crater in the west, next to the active main crater. ... [mehr]
Mittwoch, Mai 23, 2012
As a recent visit to Anak Krakatau shows, the summit lava dome inside the crater continues to grow. So far, no significant explosive activity seems to have taken place, but that could change quickly. [mehr]
Dienstag, Apr 10, 2012
It appears that a new vent has opened at the new lava dome of Anak Krakatau volcano and started to emit ash, as Øystein Lund Andersen reports from a recent visit: ... [mehr]
Mittwoch, Mär 28, 2012
Der Lavadom im Gipfelkraters des Anak Krakatau ist aktiv und wächst weiter. Unser Expeditionsleiter Andi kehrt gerade von einem Besuch zurück und berichtet, dass der Lavadom nun etwa 100 m weit ist und zwei aktive Schlote zeigt, aus denen Jets von glühenden Gasen autreten. ... [mehr]
Freitag, Feb 17, 2012
Beobachtung von einem kürzlichen Besuch von Øystein Lund Andersen während 12-13 Feb 2012. [mehr]