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Krakatau volcano (Indonesia) July 2012: fumarole fields

Extensive fumarole fields and large expanses of altered ground are found on the southern and western base of the main cone, especially in the valley between the low, pre-1990 crater rim and the cone. Here are some impressions taken in July during our expedition to Krakatau.
A large bomb in the saddle between the old crater rim and the main cone of Anak has been covered by white and yellow sulfate deposits. (Photo: Tom Pfeiffer)
A large bomb in the saddle between the old crater rim and the main cone of Anak has been covered by ... [info]
(337 Hits)
Strong steaming from a fumarole field on the lower southern flank of Anak Krakatau. (Photo: Tom Pfeiffer)
Strong steaming from a fumarole field on the lower southern flank of Anak Krakatau. (Photo: Tom Pfei... [info]
(406 Hits)
Block encrusted with yellow and orange oxides and sulfur. (Photo: Tom Pfeiffer)
Block encrusted with yellow and orange oxides and sulfur. (Photo: Tom Pfeiffer) [info]
(346 Hits)
Small fumarole vent. (Photo: Tom Pfeiffer)
Small fumarole vent. (Photo: Tom Pfeiffer) [info]
(356 Hits)
Oxides and fumarole minerals of various colors cover the ground. (Photo: Tom Pfeiffer)
Oxides and fumarole minerals of various colors cover the ground. (Photo: Tom Pfeiffer) [info]
(460 Hits)
Beautiful monoclinic sulfur needles form around some of the hotter fumarolic vents. (Photo: Tom Pfeiffer)
Beautiful monoclinic sulfur needles form around some of the hotter fumarolic vents. (Photo: Tom Pfei... [info]
(421 Hits)
Sublimating sulfur covers blocks and gives them a greenish-yellowish stain. (Photo: Tom Pfeiffer)
Sublimating sulfur covers blocks and gives them a greenish-yellowish stain. (Photo: Tom Pfeiffer) [info]
(320 Hits)
Oxidized and sulfur-covered blocks. (Photo: Tom Pfeiffer)
Oxidized and sulfur-covered blocks. (Photo: Tom Pfeiffer) [info]
(337 Hits)
View across the fumarole field towards the west with Rakata island in the left background. (Photo: Tom Pfeiffer)
View across the fumarole field towards the west with Rakata island in the left background. (Photo: T... [info]
(346 Hits)
Our group walking on white altered ground at the foot of the cone of Anak Krakatau (Photo: Tom Pfeiffer)
Our group walking on white altered ground at the foot of the cone of Anak Krakatau (Photo: Tom Pfeif... [info]
(314 Hits)
Yellow-greenish ground in the very active fumarole field. (Photo: Tom Pfeiffer)
Yellow-greenish ground in the very active fumarole field. (Photo: Tom Pfeiffer) [info]
(329 Hits)
Yellow block coated by oxides and sulfur. (Photo: Tom Pfeiffer)
Yellow block coated by oxides and sulfur. (Photo: Tom Pfeiffer) [info]
(365 Hits)
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