By ExploreNow Editor, on August 23rd, 2012
Volcano Type: Stratovolcano
Volcano Status: Anthropology
Last Known Eruption: Unknown
Summit Elevation: 435 m 1,427 feet
Latitude: 17.87°S 17°52’0″S
Longitude: 148.07°W 148°4’0″W
The 1.5-km-wide, steep-sided island of Mehetia, the youngest and SE-most of the Society Islands, lacks a well-developed fringing coral reef. The 435-m-high island (known as Meetia or Meketia in the Tahitian and Tuamotuan languages, respectively) is the summit of a large volcano that rises 4000 m from the sea floor. An older edifice is formed of a lava flow sequence overlain by hydromagmatic deposits and strombolian ejecta. A well-preserved Holocene crater, 150 m wide and 80 m deep, is located NW of the summit and has been the source of the youngest lava flows on the island (Binard et al., 1993). Polynesian legends mention “large fires,” and the lack of vegetation on some lava flows suggests that the latest activity occurred within the last 2000 years (Talandier and Custer, 1976). Other recent activity at Tehetia originated from a submarine crater at 2500-2700 m depth on the SE flank.
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- Mehetia Island and Volcano
The 1.5-km-wide, steep-sided island of Mehetia, seen here from the south, is the youngest and SE-most of the Society Islands. The 435-m-high island is the summit of a large volcano that rises 4000 m from the sea floor. Wave erosion has truncated lava flows of an older edifice, leaving steep cliffs that overlie coral reefs seen at the peninsula in the left foreground. The summit of the island is formed by a younger edifice that may have been the source of apparent eruptive events mentioned in Polynesian legends.
Originally posted 2010-07-06 16:51:58.
By ExploreNow Editor, on August 23rd, 2012
Volcano Type: Shield volcano
Volcano Status: Holocene
Last Known Eruption: Unknown
Summit Elevation: 759 m 2,490 feet
Latitude: 0.88°S 0°53’0″S
Longitude: 89.50°W 89°30’0″W
San Cristóbal Island consists of a densely vegetated western part and a lower, younger eastern part with many extremely youthful lava flows. The SW-side shield volcano morphologically resembles low-angle Hawaiian shields more than the steep-sided shields of Fernandina and Isabela Island. Most lava flows on the NE part of the island originated from SW-NE-trending fissures. Young lava flows have reached the sea, where some littoral cones formed. The latest eruptions were prehistorical in age, but are probably less than 1000 years old. Kicker Rock, two paired, steep-cliffed islands separated by a narrow cleft, is an enroded remnant of a tuff cone that forms one of the scenic highlights of the Galápagos, 5 km off the west coast of San Cristóbal.
Satellite view of San Cristobal
Click Here For The Rest Of San Cristóbal, Galápagos Islands, Ecuador
Originally posted 2010-08-27 03:17:24.
By ExploreNow Editor, on August 22nd, 2012
Volcano Type: Scoria cones
Volcano Status: Holocene
Last Known Eruption: Unknown
Summit Elevation: Unknown
Latitude: 14.57°N 14°34’0″N
Longitude: 25.85°E 25°51’0″E
The Kutum basaltic volcanic field in the northern Dafur area of western Sudan, is located SW of the larger Meidob volcanic field. As with other Saharan volcanic fields, Kutum (also known as the Tagabo Hills or Berti Hills) contains very well-preserved cones, lava flows, and explosion craters. They were considered to be of late-Pleistocene or even Holocene age. Franz et al., however, assigned only Tertiary age ranges for rocks from Tagabo Hills.
Originally posted 2010-10-29 07:45:52.
By ExploreNow Editor, on August 22nd, 2012
Volcano Type: Caldera
Volcano Status: Historical
Last Known Eruption: 2008
Summit Elevation: 1592 m 5,223 feet
Latitude: 32.881°N 32°52’51″N
Longitude: 131.106°E 131°6’23″E
The 24-km-wide Aso caldera was formed during four major explosive eruptions from 300,000 to 90,000 years ago. These produced voluminous pyroclastic flows that covered much of Kyushu. The last of these, the Aso-4 eruption, produced more than 600 cu km of airfall tephra and pyroclastic-flow deposits. A group of 17 central cones was constructed in the middle of the caldera, one of which, Naka-dake, is one of Japan’s most active volcanoes. It was the location of Japan’s first documented historical eruption in 553 AD. The Naka-dake complex has remained active throughout the Holocene. Several other cones have been active during the Holocene, including the Kometsuka scoria cone as recently as about 210 AD. Historical eruptions have largely consisted of basaltic to basaltic-andesite ash emission with periodic strombolian and phreatomagmatic activity. The summit crater of Naka-dake is accessible by toll road and cable car, and is one of Kyushu’s most popular tourist destinations.
Click Here For The Rest Of Aso, Kyushu, Japan
Originally posted 2010-08-21 05:00:45.
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