Anak Krakatau volcano (Indonesia), activity update: lava dome has disappeared, new hydrothermal vents
samedi juil. 07, 2012 16:31 | AUTEUR : 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.
mercredi, 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. ... [details]
mercredi, 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. [details]
mardi, avril 10, 2012
Il apparaît qu'une nouvelle bouche s'est ouverte au nouveau dôme de lave du volcan Anak Krakatau et a commencé à émettre de la cendre, comme Ø Ystein Lund Andersen rapporte d'une visite récente : ... [details]
mercredi, mars 28, 2012
Un dôme de lave actif grandit à l'intérieur du cratère au sommet du volcan Krakatau. Notre Tour Leader d'expédition Andi est juste revenu d'une visite et rapporte l'information que le dôme est maintenant environ de 100 m de largeur et a 2 conduits actifs principaux qui éjectent des jets de gaz incandescent. ... [details]
vendredi, févr. 17, 2012
Observation d'une récente visite de Øystein Lund Andersen pendant 12-13 février 2012. [details]
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