Ottawa-Bonnechere Graben

Ottawa-Bonnechere Graben
Map of the Ottawa-Bonnechere and Timiskaming grabens
Map of the Ottawa-Bonnechere and Timiskaming grabens
LocationOntario and Quebec, Canada
Part ofSaint Lawrence rift system
AgeLate Proterozoic to Early Paleozoic
GeologyGraben
Dimensions
 • Length700 km (435 mi)

The Ottawa-Bonnechere Graben (also known as the Ottawa Graben) is a geological structure that coincides with a 55 km (34 mi) wide topographic depression extending from near Montréal through Ottawa. It is part of the Saint Lawrence rift system that also includes the seismically active Saguenay graben.[1] This rift valley was formed when the Earth's crust moved downward about a kilometre between two major fault zones known as the Mattawa and Petawawa faults.[2]

  1. ^ Rimando, Rolly E.; Benn, Keith (2005). "Evolution of faulting and paleo-stress field within the Ottawa graben, Canada". Journal of Geodynamics. 39 (4): 337–360. Bibcode:2005JGeo...39..337R. doi:10.1016/j.jog.2005.01.003.
  2. ^ Cite error: The named reference SI was invoked but never defined (see the help page).