
1) German geological term
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https://www.crosswordclues.com/clue/graben

A crustal block of rock generally long and narrow, that has dropped down along boundary faults relative to the adjacent rocks.
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http://earthquakescanada.nrcan.gc.ca/info-gen/glossa-eng.php

In geology, a graben is a depressed block of land bordered by parallel faults. Graben is German for ditch or trench. The plural form is variously given as graben or grabens. A graben is the result of a block of land being downthrown producing a valley with a distinct scarp on each side. Graben often occur side-by-side with horsts. Horst and graben...
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http://en.wikipedia.org/wiki/Graben

An elongate crustal block that is relatively depressed (downdropped) between two fault systems.
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http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html

a rift valley
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http://phrontistery.info/g.html

An elongate crustal block that is relatively depressed (downdropped) between two fault systems.
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http://volcano.oregonstate.edu/glossary/1

(from the article `horst and graben`) elongate fault blocks of the Earth`s crust that have been raised and lowered, respectively, relative to their surrounding areas as a direct effect ... ...the surrounding fault blocks, which commonly rise during an episode of crustal extension, creates a rift valley or tectonic basin. The geologic ....
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http://www.britannica.com/eb/a-z/g/54

Credit: US Geological Survey A long, relatively narrow area of rock that has slid down between parallel faults. Unless erosion wears these down to its level, the result is a rift valley. See also horst. • GEOLOGY AND PLANETARY SCIENCE Source: U.S. Geological Survey
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http://www.daviddarling.info/encyclopedia/G/graben.html

An elongate crustal block that is relatively depressed (downdropped) between two fault systems.
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http://www.encyclo.co.uk/local/21455

A block of rock that lies between two faults and has moved downward to form a depression between the two adjacent fault blocks. See also horst.
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http://www.encyclo.co.uk/local/22291

A downthrown block between two normal faults of parallel strike but converging dips
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http://www.encyclo.co.uk/local/22392

a normally faulted elongate trough or block of rock, down-thrown on both sides;
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http://www.encyclo.co.uk/visitor-contributions.php

a topographic valley, created by motions along faults at the edges of the valley (see Fig. 2a).
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http://www.encyclo.co.uk/visitor-contributions.php

An elongate fault block that has been lowered in relation to the blocks on either side.
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http://www.evcforum.net/WebPages/Glossary_Geology.html

A downthrown block between two normal faults of parallel strike but converging dips; hence a tensional feature. See also horst.
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http://www.scientificpsychic.com/etc/geology-glossary.html

An elongated, relatively depressed crustal unit or block that is bounded by faults on its sides.
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http://www.solarviews.com/eng/terms.htm
(single location Germany)Found on
https://glossary.wein.plus/graben-single-location-germany

A long, relatively depressed crustal unit or block that is bounded by faults along its sides; a trough.
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https://pds.jpl.nasa.gov/planets/special/glossary.htm

see rift
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https://www.encyclo.co.uk/local/22327

A down faulted block of rock.
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https://www.encyclo.co.uk/local/22734
No exact match found.