Definitions for rift valley
This page provides all possible meanings and translations of the word rift valley
Random House Webster's College Dictionary
Origin of rift valley:
a valley with steep sides; formed by a rift in the earth's crust
A graben structure between two tectonic plates which are opening relative to each other.
A mid-oceanic ridge system with central valleys.
A rift valley is a linear-shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. This action is manifest as crustal extension, a spreading apart of the surface, which is subsequently further deepened by the forces of erosion. When the tensional forces are strong enough to cause the plate to split apart, it will do so such that a center block will drop down relative to its flanking blocks, forming a graben. This creates the nearly parallel steeply dipping walls. This feature is the beginning of the rift valley. As this process continues, the valley widens, until it becomes a large basin, that fills with sediment from the rift walls and the surrounding area. One of the better long-term examples of this process is the East African Rift. Rifts can occur at all elevations, from the sea floor to plateaus and mountain ranges. They can occur in continental crust or in oceanic crust. Rift valleys are often associated with a number of adjoining subsidiary or co-extensive valleys, which are typically considered part of the principal rift valley geologically. The most extensive rift valley is located along the crest of the mid-ocean ridge system and is the result of sea floor spreading. Examples of this type of rift include the Mid-Atlantic Ridge and the East Pacific Rise.
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