rift valley


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Related to rift valley: Rift Valley fever, Great Rift Valley

rift valley,

elongated depression, trough, or graben in the earth's crust, bounded on both sides by normal faults and occurring on the continents or under the oceans. The central flat block forming the trough slips downward relative to the crustal blocks on either side. The appearance is that of a fallen keystone in a broken arch. Rift valleys form by tensional forces, typically those associated with the initiation of plate separation (see plate tectonicsplate tectonics,
theory that unifies many of the features and characteristics of continental drift and seafloor spreading into a coherent model and has revolutionized geologists' understanding of continents, ocean basins, mountains, and earth history.
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). The development of a rift valley in a continent is believed to be a precursor to the breakup of the continent and the development of a new ocean basin by seafloor spreadingseafloor spreading,
theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. First proposed in the early 1960s by the American geologist Harry H.
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. Rift valleys, such as the Red Sea and the African rift valleys, are commonly the sites of volcanism and the locus of much earthquake activity.

rift valley

[′rift ‚val·ē]
(geology)
A deep, central cleft with a mountainous floor in the crest of a midoceanic ridge. Also known as central valley; midocean rift.

rift valley

a long narrow valley resulting from the subsidence of land between two parallel faults, often associated with volcanism. The East African Rift Valley is an example
References in periodicals archive ?
There has been disquiet within the Rift Valley Jubilee fraternity over the recent appointments, with some claiming the engagements did not favour the region.
All of Kenya's geothermal success thus far has come from the Olkaria Area, but the government now plans to "replicate the success" of Olkaria by exploiting eight more Rift Valley sites.
World Animal Health Information Database, 2012: event summary, Rift Valley fever, Namibia [cited 2015 Apr 27].
As Rift Valley Railways continues to rehabilitate its fleet and operations, reliance on the regional railway will surely grow.
Kenya has already developed 190 MW of geothermal power through a 1980s World Bank-financed project at the Rift Valley site of Olkaria, and last year obtained financing to expand its capacity by an additional 280 MW.
If you stripped away all of the ice here today, you'd see a feature every bit as dramatic as the huge rift valleys you see in Africa and in size as significant as the Grand Canyon.
Rift Valley Railways has a 25-year concession to operate a century-old rail line linking the Indian Ocean port of Mombasa in Kenya to the interior of Kenya and Uganda, including Kampala.
NAIVASHA, Kenya: The mist lifts from the mountains of Kenya's fabled Rift Valley, better known for its flamingoes and zebras than its wine, as women weave in and out with baskets of grapes on their heads.
Rift Valley fever (RVF) is a viral zoonosis endemic to Africa (1) that primarily affects domestic ruminants, causing large epizootics with high mortality rates in young animals and abortions.
Politicians and analysts predict that the referendum will be largely peaceful, but several hundred people in the country's Rift Valley have already fled their homes before the vote, fearing a new flare-up.
The second annual Rift Valley Charity Ball in aid of Justice for Children is to be held on Saturday at the Assembly Rooms in Newcastle.