High Quality Content by WIKIPEDIA articles! The Saguenay Graben is a graben in the Greenville Province of southern Quebec, Canada. It contains a long flat-bottomed basin 250 km (155 mi) long and 50 km (31 mi) wide. The faults associated with the Saguenay Graben have been the source for earthquakes, including the 1988 Saguenay earthquake. In geology, a graben is a depressed block of land bordered by parallel faults. Graben is German for ditch. Graben is used for both the singular and plural. 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 structures are indicative of tensional forces and crustal stretching.