graben

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grabenBrian, cyan, Gaian, Geminian, Hawaiian, ion, iron, Ixion, lion, Lyon, Mayan, Narayan, O'Brien, Orion, Paraguayan, prion, Ryan, scion, Uruguayan, Zion •andiron •gridiron, midiron •dandelion • anion • Bruneian •cation, flatiron •gowan, Palawan, rowen •anthozoan, bryozoan, Goan, hydrozoan, Minoan, protozoan, protozoon, rowan, Samoan, spermatozoon •Ohioan • Chicagoan • Virgoan •Idahoan •doyen, Illinoisan, IroquoianEwan, Labuan, McEwan, McLuhan, Siouan •Saskatchewan • Papuan • Paduan •Nicaraguan • gargantuan •carbon, chlorofluorocarbon, graben, hydrocarbon, Laban, radiocarbon •ebon • Melbourne • Theban •gibbon, ribbon •Brisbane, Lisbon •Tyburn •auburn, Bourbon •Alban • Manitoban • Cuban •stubborn •Durban, exurban, suburban, turban, urban

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graben A downthrown, linear, crustal block, bordered lengthways by normal faults. The upstanding blocks on either side may have been lowered by erosion. It is a structural feature, which may be of considerable length, caused by the relative lowering of a block between two faults or fault zones. The faults are commonly high-angle, normal faults which are parallel in their strike direction. Half-graben are bounded on only one side by one or more faults and are associated mainly with tilt-block tectonics. Graben with a regional extent and topographic expression can also be called rift valleys. Compare HORST.