Actualitées du volcan Ol Doinyo Lengai:
The volcano continues to slowly erupt natrocarbonatite lava inside the deep pit crater of the 2007-08 cinder cone which occupies the active northern crater of Lengai volcano. We present a selection of aerial photos taken a few days ago by our friend Gian Schachenmann. ... lire toutes
lun., 8 juil. 2013, 14:38
The volcano continues to be active, and produce natrocarbonatite lava that slowly fills up the crater. A small cone of natrocarbonatite lava is forming on the western side of Lengai's crater, which formed in 2008 during a series of violent explosions that destroyed the former bizarre crater terrace filling the north crater, famous for the bizarre "hornitos" of white and gray lava. ... lire toutes
Une éruption explosive en Tanzanie du volcan Ol Doinyo Lengaii en 1966. L’activité explosive a démarré en août 1966, près de la fin d'une phase éruptive qui avait débutée en 1960 et qui se résumait à des émissions silencieuses de coulées de lave dans le cratère sommital. Les dépôts de cendres provenant d'éruptions précédentes blanchissent les pentes du volcan comme de la neige. (Photo par Gordon Davies, 1966 / gracieuseté de Celia Nyamweru, Université de Kenyatta).
Le cratère acitf nord du volcan Ol Doinyo Lengai
Observant les éruptions stromboliennes de laves noires carbonatites du volcan Lengai
scène nocturne dans le cratère actif du Lengai
Lave natrocarbonatite blanchies et un cône étroit - nommé hornito
Hornito en éruption la nuit, Ol Doinyo Lengai, Tanzanie
Ol Doinyo Lengai volcan
Stratovolcano 2890 m
Tanzania, -2.75°S / 35.9°E
Condition actuelle: en vigilance - niveau agité (2 sur 5)
Last update: 20 Aug 2019 (effusion of natrocarbonatite lava inside the pit crater in the northern main crater)
Ol Doinyo Lengai, a symmetrical, steep classical stratovolcano rises majestically about 2000m from the East Africal Rift Valley depression to a summit elevation of 2890 m. To the Maassai people, it is home of God, which is also the meaning of the name. Ol Doinyo Lengai is the only active volcano that erupts natrocarbonatite lava.
Style éruptif tipique
: Explosive activity. In addition, at least during the past +-30 years near-continuous effusion and mildly explosive eruption of natrocarbonatite lava from vents inside the crater, sometimes overflowing over the rim, is taking place.
Eruptions du volcan Ol Doinyo Lengai
: 1550 BC (?), 50 AD (?), 700 AD (?), 1350 (?), 1880, 1882, 1904, 1907, 1914, 1916, 1921, 1926, 1940, 1954, 1955, 1958, 1960, 1967, 1983, 1994, 2006, 2007-ongoing
Latest nearby earthquakes
No recent earthquakes
|Heure||Mag. / Profondeur||Distance||Location|
Ol Doinyo Lengai is an extremely fascinating volcano: it is the only active volcano known to erupt carbonatite lava, a sensational discovery scientists made as recently as in the 1960s: the lavas it erupts are NOT melts based on silica, but on natroncarbonate!
Thus, the temperatures of these lavas are much lower, "only" about 600 deg. C., and Lengai's lava does not emit enough light to glow during day,- only at night, a dull reddish glow that does not illuminate anything is visible. Also because of its peculiar chemical composition, the lava is extremely fluid and behaves very much like water, with the exception that it is black like oil. After it is cooled down it quickly alters and becomes a whitish powder.
Geologically, the present-day cone of the volcano was constructed about 15,000 years ago. Historical eruptions have been moderate to small explosive events. In addition to its intermittent explosive activity at intervals of typically years or decades, numerous natrocarbonitite lava flows have been erupted from vents on the floor of the active summit crater.
The depth and morphology of the active (northern) crater have changed dramatically during the course of historical eruptions, ranging from steep craters walls about 200 m deep in the mid-20th century to shallow platforms mostly filling the crater. Long-term lava effusion in the summit crater beginning in 1983 had by the turn of the century mostly filled the northern crater; by late 1998 uptill today lava had begun overflowing the crater rim.
Ol Doinyo Lengai Photos
Activité en 2010 - natrocarbonatite se jette sur le cratère bootom
De même pour les phases précédentes, nouvelle natrocarbonatite lave est étant éclaté d'évents au fond du cratère nouvel. Si cette activité se poursuit, il pourrait remplir à nouveau le cratère.
Voyages au volcan Ol Doinyo Lengai :The Garden of Eden
(10-days trekking and wildlife safari to the Ngorongoro Highlands and the Rift Valley, Tanzania)
See also: Sentinel hub
| Landsat 8
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