| Barrier Volcano | |
|---|---|
  Barrier Volcano Location in Kenya | |
| Highest point | |
| Elevation | 1,032 m (3,386 ft) |
| Listing | List of volcanoes in Kenya |
| Coordinates | 2°19′09″N36°35′16″E / 2.319198°N 36.587906°E Coordinates: 2°19′09″N36°35′16″E / 2.319198°N 36.587906°E |
| Geography | |
| Location | Kenya |
| Geology | |
| Mountain type | Shield volcano |
| Last eruption | 1921 or 1922 |
The Barrier Volcano is an active shield volcano located in the north of Kenya. It is last known to have erupted in 1921. [1]
The Barrier Volcano was given its name because it forms a barrier about 20 kilometres (12 mi) long across the Kenyan Rift Valley. It has a width of 15 kilometres (9.3 mi) and separates Lake Turkana to the north and the Suguta Valley and the small Lake Logipi to the south. The volcanic complex consists of four distinct volcanoes. From west to east these are Kalolenyang, Kakorinya, Likaiu West and Likaiu East. The foundation rocks are mainly basalt. About 90% of the volume is trachyte. [2]
Kakorinya is the youngest of the group and forms the center of the complex, with a well-preserved circular crater that has not been breached. [2] The 3.8 kilometres (2.4 mi) wide summit caldera of Kakorinya was formed about 92,000 years ago. [1] Much of the floor of the caldera is filled with trachytic and phonolitic lava domes and flows that recently erupted within the caldera and along its ring fracture. There are scoria cones and lava flows from the early Holocene on the north and south flanks of the volcano complex. In the 19th and 20th centuries there have been explosive eruptions and lava flows from Teleki on the northern side and from Andrew's cone on the south side of Kakorinya. The last known eruption was in 1921. [1]
A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid lava, which travels farther and forms thinner flows than the more viscous lava erupted from a stratovolcano. Repeated eruptions results in the steady accumulation of broad sheets of lava, building up the shield volcano's distinctive form.
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Cerro Azul, sometimes referred to as Quizapu, is an active stratovolcano in the Maule Region of central Chile, immediately south of Descabezado Grande. Part of the South Volcanic Zone of the Andes, its summit is 3,788 meters (12,428 ft) above sea level, and is capped by a summit crater that is 500 meters (1,600 ft) wide and opens to the north. Beneath the summit, the volcano features numerous scoria cones and flank vents.
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Namarunu is a shield volcano located in the Great Rift Valley, Kenya.
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The geology of the Pacific Northwest includes the composition, structure, physical properties and the processes that shape the Pacific Northwest region of North America. The region is part of the Ring of Fire: the subduction of the Pacific and Farallon Plates under the North American Plate is responsible for many of the area's scenic features as well as some of its hazards, such as volcanoes, earthquakes, and landslides.
The Silverthrone Caldera is a potentially active caldera complex in southwestern British Columbia, Canada, located over 350 kilometres (220 mi) northwest of the city of Vancouver and about 50 kilometres (31 mi) west of Mount Waddington in the Pacific Ranges of the Coast Mountains. The caldera is one of the largest of the few calderas in western Canada, measuring about 30 kilometres (19 mi) long (north-south) and 20 kilometres (12 mi) wide (east-west). Mount Silverthrone, an eroded lava dome on the caldera's northern flank that is 2,864 metres (9,396 ft) high, may be the highest volcano in Canada.
The Mount Edziza volcanic complex is a large and potentially active north-south trending complex volcano in Stikine Country, northwestern British Columbia, Canada, located 38 kilometres (24 mi) southeast of the small community of Telegraph Creek. It occupies the southeastern portion of the Tahltan Highland, an upland area of plateau and lower mountain ranges, lying east of the Boundary Ranges and south of the Inklin River, which is the east fork of the Taku River. As a volcanic complex, it consists of many types of volcanoes, including shield volcanoes, calderas, lava domes, stratovolcanoes, and cinder cones.
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