Ol Doinyo Lengai volcano, Feb 2007

In Feb. 2007, Ol Doinyo Lengai's summit was characterized by the formation of a large collapse crater and the absense of visible activity. However, magma moving at shallow depths beneath the surface was clearly audible.
A report of this visit can be found here.
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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]
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The central collapse area (Photo: Tom Pfeiffer)
The central collapse area (Photo: Tom Pfeiffer) [info]
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Hornito T49b behind the collapse area (Photo: Tom Pfeiffer)
Hornito T49b behind the collapse area (Photo: Tom Pfeiffer) [info]
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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]
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Stalactites hanging fromthe walls of the cavity. (Photo: Tom Pfeiffer)
Stalactites hanging fromthe walls of the cavity. (Photo: Tom Pfeiffer) [info]
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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]
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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]
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The unstable rim of the pit crater (Photo: Tom Pfeiffer)
The unstable rim of the pit crater (Photo: Tom Pfeiffer) [info]
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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]
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Peter, our Maassai guide, in front of the remaining of hornito T49b, miraculously still standing next to the collapse pit. (Photo: Tom Pfeiffer)
Peter, our Maassai guide, in front of the remaining of hornito T49b, miraculously still standing nex... [info]
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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]
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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]
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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]
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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]
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For comparison: a view from the same position in January 2008... Wide angle view of the northern crater with an eruption from the ash cone. Lake Natron and the Rift Valley can be seen in the background landscape 2000m below. 
More from January 2008 at this page. (Photo: Tom Pfeiffer)
For comparison: a view from the same position in January 2008... Wide angle view of the northern cra... [info]
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The path on the ridge leading to the summit. (Photo: Tom Pfeiffer)
The path on the ridge leading to the summit. (Photo: Tom Pfeiffer) [info]
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