rift zone

A rift zone is an elongate system of crustal fractures associated with an area that has undergone extension (ground has spread apart). On the great shield volcanoes in Hawai`i, a rift zone consists of many different features associated with the rise and eruption of magma from narrow dikes, including eruptive fissures, cinder and spatter cones, spatter ramparts, pit craters, lava flows, ground cracks, and normal faults.
Photograph by J.P. Lockwood in July 1975.
Aerial view of the northeast rift zone of Mauna Loa Volcano, Hawai`i. Dark lava flows spread away from the rift zone.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

Look at other dictionaries:

  • Rift zone — A rift zone is a feature of some volcanoes, especially the shield volcanoes of Hawaii, in which a linear series of fissures in the volcanic edifice allows lava to be erupted from the volcano s flank instead of from its summit. For example, in the …   Wikipedia

  • rift zone — Geol. a system of related, narrow structural depressions between parallel faults. [1965 70] * * * rift zone, Geology. a large area of the earth in which a rift occurs when plates of the earth s crust move away from one another …   Useful english dictionary

  • rift zone — Geol. a system of related, narrow structural depressions between parallel faults. [1965 70] * * * …   Universalium

  • Baikal Rift Zone — [ USGS factsheet] The Baikal Rift Zone is a divergent plate boundary centered beneath Lake Baikal in southeastern Russia. To its west is the Eurasian Plate and to its east is the Amur Plate which is moving away from the rift toward Japan at about …   Wikipedia

  • Rift — Chasm redirects here. For other uses, see Chasm (disambiguation). For other uses, see Rift (disambiguation). USGS image Plates in the crust of the earth, accordin …   Wikipedia

  • Rift Valley lakes — The Rift Valley lakes are a group of lakes in the Great Rift Valley formed by the East African Rift which runs through the whole eastern side of the African continent from north to south. These lakes include some of the oldest, largest and… …   Wikipedia

  • Rift valley — A rift valley is a linear shaped lowland between 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 …   Wikipedia

  • Rift lake — A rift lake is a lake formed as a result of subsidence related to movement on faults within a rift zone, an area of extensional tectonics in the continental crust. They are often found within rift valleys and may be very deep. Rift lakes may be… …   Wikipedia

  • rift — [ rift ] n. m. • 1942; mot angl., abrév. de rift valley « fossé d effondrement » ♦ Géogr. Fossé tectonique long de plusieurs centaines ou de plusieurs milliers de kilomètres, correspondant à une zone de fracture de l écorce terrestre. Les grands… …   Encyclopédie Universelle

  • RIFT — Entwickler Trion Wor …   Deutsch Wikipedia

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