An elongated block of the earth's crust lying between two faults and displaced downwards relative to the blocks on either side, as in a rift valley.‘These faults bound horsts, grabens and tilted blocks.’
- ‘The area is characterized by a series of low-relief Jurassic horsts and graben.’
- ‘A graben is a down-dropped block of the crust resulting from extension, or pulling, of the crust.’
- ‘Earlier workers typically regarded the Messaras basin as a simple east-west-trending graben.’
- ‘The fault discovered by the team begins near the Swiss Jura mountains south of Basel and extends nearly five miles northeasterly through the Rhine graben, a valley near the city's southern edge.’
Late 19th century from German Graben ‘a ditch’.
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