The term graben comes from the German word for "trench", related etymologically to the word for "grave". Grabens can be produced by earthquakes; such subsidences caused great damage during the 1964 Alaska Earthquake. A graben is the geological opposite of a horst, which surrounds a graben. Alternating horsts and grabens are part of a basin and range system.

The Rhine river valley is probably the most famous example of a graben.

Schematic of a graben:

___________                         ___________
|          \                       /           |
|           \                     /            |
|            \___________________/             |
|             \                 /              |
|              \       |       /               |
|               \      |      /                |
|                \     |     /                 |
|                 \   \|/   /                  | 
|__________________\_______/___________________|

Log in or registerto write something here or to contact authors.