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Volcan Ol Doinyo Lengaï, février 2007

En février 2007, sommet de le du Ol Doinyo Lengaï a été caractérisée par la formation d'un cratère de grand effondrement et l'absence d'activité visible. Cependant, le magma se déplaçant à faible profondeur sous la surface était clairement audible.
On trouvera un rapport de cette visite ici.
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The tall hornito T49b still standing. To the right, the collapse area in the center of the crater. (Photo: Tom Pfeiffer)
The tall hornito T49b still standing. To the right, the collapse area in the center of the crater. (... [info]
(1557 Hits)
The central collapse area (Photo: Tom Pfeiffer)
The central collapse area (Photo: Tom Pfeiffer) [info]
(681 Hits)
Hornito T49b behind the collapse area (Photo: Tom Pfeiffer)
Hornito T49b behind the collapse area (Photo: Tom Pfeiffer) [info]
(766 Hits)
A cavity in the ground, probably the interior of a hornito now covered to the top by lava flows. (Photo: Tom Pfeiffer)
A cavity in the ground, probably the interior of a hornito now covered to the top by lava flows. (Ph... [info]
(876 Hits)
The green ridge that separates the active north crater from the south crater is seen in the background behind some older hornitos. (Photo: Tom Pfeiffer)
The green ridge that separates the active north crater from the south crater is seen in the backgrou... [info]
(621 Hits)
The (older) crater walls beneath the green summit ridge in the background. A person for scale. (Photo: Tom Pfeiffer)
The (older) crater walls beneath the green summit ridge in the background. A person for scale. (Phot... [info]
(1376 Hits)
The unstable rim of the pit crater (Photo: Tom Pfeiffer)
The unstable rim of the pit crater (Photo: Tom Pfeiffer) [info]
(694 Hits)
A weak glow from shallow magma is visible from one of the holes in the floor of the collapse pit. Moving magma is audible with sloshing sounds similar to a washing machine.  (Photo: Tom Pfeiffer)
A weak glow from shallow magma is visible from one of the holes in the floor of the collapse pit. Mo... [info]
(3140 Hits)
The same hornito seen more from the east, showing the cut by the collapse.  (Photo: Tom Pfeiffer)
The same hornito seen more from the east, showing the cut by the collapse. (Photo: Tom Pfeiffer) [info]
(787 Hits)
The majestic cone of Ol Doinyo Lengai stratovolcano and the grassland at its feet seen from the NE. The tall hornito T49b in its active crater is well visible.
 (Photo: Tom Pfeiffer)
The majestic cone of Ol Doinyo Lengai stratovolcano and the grassland at its feet seen from the NE. ... [info]
(2670 Hits)
The north crater at night the full moon illuminates a moonscape. (Photo: Tom Pfeiffer)
The north crater at night the full moon illuminates a moonscape. (Photo: Tom Pfeiffer) [info]
(765 Hits)
View from the summit onto the active north crater dominated by the large hornito T49b and the collapse area in the center. Lake Natron and the Rift Valley floor 2000 meters below in the background. (Photo: Tom Pfeiffer)
View from the summit onto the active north crater dominated by the large hornito T49b and the collap... [info]
(1948 Hits)
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