O'a Caldera volcano

Caldera 2075 m / 6,808 ft
Ethiopia, 7.47°N / 38.58°E
Current status: normal or dormant (1 out of 5)

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Typical eruption style: unspecified
O'a Caldera volcano eruptions: unknown, no recent eruptions

Latest nearby earthquakes

No recent earthquakes
TimeMag. / DepthDistance/Location

Background

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.
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Smithsonian / GVP volcano information

O'a Caldera Photos

View onto Cemoro Lawang village on the caldera rim (Photo: Tom Pfeiffer)
View onto Cemoro Lawang village on the caldera rim (Photo: Tom Pfeiffer)
The Tengger caldera in the morning (Photo: Tom Pfeiffer)
The Tengger caldera in the morning (Photo: Tom Pfeiffer)
Aerial view of Vulcano Island. The left older part of the island is an older caldera - the remnant of a dissected stratovolcano, the right part is a younger caldera where the present-day harbour and tourist village of Vulcano is located next to the active cone (light brown) La Fossa. A narrow land bridge connects the island with the peninsula formed by the little cone Vulcanello (an island, that appeared in Roman times), mostly out of the right frame in this picture. (Photo: Tom Pfeiffer)
Aerial view of Vulcano Island. The left older part of the island is an older caldera - the remnant of a dissected stratovolcano, the right part is a younger caldera where...
Volcanic trio: Batok cinder cone (foreground), smoking Bromo, and majestic Semeru with an umbrella cloud. 
This view of East Java's Tengger caldera (Indonesia) is one of the country's most famous viewpoints, visited every day by hundreds of tourists. (Photo: Tom Pfeiffer)
Volcanic trio: Batok cinder cone (foreground), smoking Bromo, and majestic Semeru with an umbrella cloud.
This view of East Java's Tengger caldera (Indonesia) is o...
 



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