O'a Caldera Volcano
Updated: 25 avril. 2024 06:42 GMT -
Caldera 2075 m / 6,808 ft
Ethiopia, 7.47°N / 38.58°E
Condition actuelle: normal / en sommeil (1 sur 5)
Ethiopia, 7.47°N / 38.58°E
Condition actuelle: normal / en sommeil (1 sur 5)
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Eruptions du volcan O'a Caldera: unknown, no recent eruptions
Derniers séismes proches
Heure | Mag. / Profondeur | Distance / Lieu |
Introduction
O'a caldera along the central Ethiopian Rift is the country's largest rift-valley caldera. The caldera forms the eastern portion of the 15 x 25 km dumbbell-shaped Lake O'a (also known as Lake Shalla). Formation of the caldera about 240,000 years ago was accompanied by the eruption of two ignimbrite deposits, the first of which was strongly welded. The only post-caldera activity consists of two pyroclastic cones north of the caldera, one silicic and the other basaltic, and a group of tuff rings, spatter cones, and lava flows of Holocene (perhaps as young as prehistorical) age near the SW shore of the lake. These were erupted along the Corbetti-Shalla segment of the Wonji Fault Belt, which extends north from Corbetti caldera. Fumarolic activity continues on all sides of the lake.---
Smithsonian / GVP volcano information
O'a Caldera Volcano Photos
Vue sur le village de Cemoro Lawang au bord de la caldeira (Photo: Tom Pfeiffer)
Très rare et gros (2 cm !) cristal d'olivine sur un rocher de la caldeira de Tengger (Photo: Tobias Schorr)
La caldeira du Tengger le matin (Photo: Tom Pfeiffer)
La Caldera Blanca est l'un des plus beaux cratères volcaniques. (Photo: Tobias Schorr)