By ExploreNow Editor, on May 18th, 2012%
Volcano Type: Shield volcanoes
Volcano Status: Historical
Last Known Eruption: 2004
Summit Elevation: 1230 m 4,035 feet
Latitude: 46.90°S 46°54’0″S
Longitude: 37.75°E 37°45’0″E
Marion Island, South Africa’s only historically active volcano, lies at the SW end of a submarine plateau immediately south of the SW Indian Ocean Ridge, opposite Prince Edward Island. The low profile of 24-km-wide dominantly basaltic and trachybasaltic Marion Island is formed by two young shield volcanoes that rise above a flat-topped submarine platform.
The 1230-m-high island is dotted by about 150 cinder cones, smaller scoria cones, and coastal tuff cones. The earliest dated eruptions took place about 450,000 years ago, but much of the island is covered by Holocene aa and pahoehoe lava flows, and more than 130 scoria cones formed during the Holocene. Many of these appear younger than the 4020 BP peat layer overlying one of the flows. Young unvegetated lava flows appear to be only a few 100 years old. The first historical eruption, during 1980, produced explosive activity and lava flows from a 5-km-long fissure that extended from the summit to the west coast.
Originally posted 2010-10-20 03:43:24.
By ExploreNow Editor, on May 16th, 2012%
Volcano Type: Scoria cones
Volcano Status: Holocene
Last Known Eruption: Unknown
Summit Elevation: 2918 m 9,573 feet
Latitude: 23.33°N * 23°20’0″N
Longitude: 5.83°E 5°50’0″E
The massive Atakor volcanic field is the largest in the Hoggar (or Ahaggar) volcanic province of southern Algeria and covers an area of 2150 sq km. Basaltic (mostly basanitic) scoria cones and lava flows of Pleistocene-Holocene age lie near spectacular older trachytic and phonolitic lava domes and volcanic necks that form some of the most dramatic scenery of northern Africa. The latest stage of activity began around 1.95 million years and continued almost to the present.
Lava flows cover Holocene lake sediments dated at about 10,000 year Before Present (BP) and alluvial terraces in which Neolithic artifacts have been found. Historical pottery has been found within lava flows in the Tahifet area, and oral traditions of the Tuareg people also suggest that eruptions were witnessed. Sporadic fumaroles and persistent small-scale seismicity has been noted during historical time.
Originally posted 2010-11-11 03:21:50.
By ExploreNow Editor, on May 5th, 2012%
Volcano Type: Stratovolcano
Volcano Status: Potassium-Argon
Last Known Eruption: 8050 BC (?)
Summit Elevation: 4507 m 14,787 feet
Latitude: 1.50°S 1°30’0″S
Longitude: 29.45°E 29°27’0″E
Karisimbi, the highest of the Virunga volcanoes, is a complex volcano with a symmetrical sharp-peaked summit. The 2-km-wide Branca caldera, located SE of the 4507-m-high summit, is filled by viscous lava flows and two explosion craters. The large, 1.2-km-wide Muntango pit crater is located south of the summit of the basanitic-to-trachytic volcano. A broad lava plain, formed from lava flows erupted within the caldera and along a chain of parasitic cones, extends SW. More than 100 parasitic cones erupted along a NNE-SSW zone that extends to the shores of Lake Kivu. The youngest Potassium-Argon date obtained is about 10,000 years before present (de Mulder, 1985). The youngest eruptions from Karisimbi produced a group of dome-shaped parasitic vents east of the caldera, which fed viscous lava flows that traveled as far as 12 km to the east, and lava flows from the SW-flank satellitic lava vents.
Click Here For The Rest Of Karisimbi, Congo
Originally posted 2010-08-23 04:16:40.
By ExploreNow Editor, on May 1st, 2012%
Volcano Type: Explosion craters
Volcano Status: Historical
Last Known Eruption: 1926
Summit Elevation: -48 m - 157 feet
Latitude: 14.242°N 14°14’30″N
Longitude: 40.30°E 40°18’0″E
Numerous phreatic explosion craters dot the Salt Plain NNE of the Erta Ale Range in one of the lowest areas of the desolate Danakil depression. These craters mark Earth’s lowest known subaerial volcanic vents. The most recent of these craters, Dallol, lies 48 m below sea level and was formed during an eruption in 1926. Colorful hot brine springs are found in the Dallol area.
 Dallol Click Here For The Rest Of Dallol, Ethiopia
Originally posted 2010-09-06 13:07:17.
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