Muhavura, Uganda

Volcano Type:      Stratovolcano
Volcano Status:    Holocene
Last Known Eruption:     Unknown
Summit Elevation:     4127 m     13,540 feet
Latitude:     1.38°S     1°23’0″S
Longitude:     29.67°E     29°40’0″E

Muhavura volcano rises to 4127 m at the NE end of the Virunga Range. It is a relatively youthful stratovolcano with a small 40-m-wide lake in its summit crater. The 3474-m-high Gahinga (Mgahinga) volcano is joined to Muhavura on the west by a broad saddle. The two volcanoes have produced basanitic-to-trachyandesitic lavas. A small parasitic crater has been recently active, but the age of the latest eruption of Muhavura is not known.

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Originally posted 2010-08-25 03:50:25.

Ol Doinyo Lengai, Tanzania

Volcano Type:      Stratovolcano
Volcano Status:    Historical
Last Known Eruption:     2010 (continuing)
Summit Elevation:     2962 m     9,718 feet
Latitude:     2.764°S     2°45’49″S
Longitude:     35.914°E     35°54’51″E

The symmetrical Ol Doinyo Lengai stratovolcano is the only volcano known to have erupted carbonatite tephras and lavas in historical time. The prominent volcano, known to the Maasai as “The Mountain of God,” rises abruptly above the broad plain south of Lake Natron in the Gregory Rift Valley. The cone-building stage of the volcano ended about 15,000 years ago and was followed by periodic ejection of natrocarbonatitic and nephelinite tephra during the Holocene. Historical eruptions have consisted of smaller tephra eruptions and emission of numerous natrocarbonatitic lava flows on the floor of the summit crater and occasionally down the upper flanks. The depth and morphology of the northern crater have changed dramatically during the course of historical eruptions, ranging from steep crater 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 lava had begun overflowing the crater rim.

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Originally posted 2010-08-20 05:00:23.

Fort Portal, Uganda

Volcano Type: Tuff cones
Volcano Status: Radiocarbon
Last Known Eruption: 2120 BC ± 100 years
Summit Elevation: 1615 m   5,298 feet
Latitude: 0.70°N *   0°42’0″N
Longitude: 30.25°E   30°15’0″E

The carbonatite lavas and tuffs of the Fort Portal volcanic field in Uganda, NE of Mount Ruwenzori between Lake Albert and Lake Edward, consists of a group of tuff cones and maars covering an area of about 145 sq km. About 50 volcanic vents, some of which now contain crater lakes, were erupted through basement rocks of Precambrian gneiss in an WSW-ENE-trending area north of the town of Fort Portal.

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Originally posted 2010-10-25 11:33:43.

Kilimanjaro, Tanzania

Kilimanjaro

Volcano Type:      Stratovolcano
Volcano Status:    Holocene
Last Known Eruption:     Unknown
Summit Elevation:     5895 m     19,340 feet
Latitude:     3.07°S     3°4’0″S
Longitude:     37.35°E     37°21’0″E

Massive Kilimanjaro, Africa’s highest mountain, consists of three large stratovolcanoes constructed along a NW-SE trend. The ice-capped, 5895-m-high summit towers 5200 m above the surrounding plains. Activity at the older cone of Shira that forms the broad WNW shoulder of Kilimanjaro began during the Pliocene, and the extensively dissected Mawenzi forms a prominent, sharp-topped peak of Pleistocene age on the upper ESE flank dominated by a densely packed radial dike swarm. More than 250 satellitic cones occupy a rift zone to the NW and SE of Kibo, the central stratovolcano. A 2.4 x 3.6 km caldera gives the summit of Kibo an elongated, broad profile. Most of Kilimanjaro was constructed during the Pleistocene, but a group of youthful-looking nested summit craters are of apparent Holocene age, and fumarolic activity continues.

Kilimanjaro

Kilimanjaro

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Originally posted 2010-08-08 04:35:57.