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Saguenay Graben
The Saguenay Graben is a rift valley or graben in the geological Grenville Province of southern Quebec, Canada. It is an elongated flat-bottomed basin long and wide, bounded by normal faults running parallel to its length.〔(【引用サイトリンク】url=http://www.canadiangeographic.ca/atlas/themes.aspx?id=rivers&sub=rivers_east_saguenay )〕
== Formation of the Saguenay Graben ==
The time of formation of the faults related to the Saugenay Graben is still under debate because it is difficult to accurately measure the age of faulting. Evidence suggests it was either the opening of the Iapetus Ocean (600-400 Ma), or the opening of the Atlantic Ocean (195-170 Ma) that caused the faulting.〔
During the opening of one of these oceans, fragmentation of the landmass occurred creating two fault planes, one to the North and one to the South. The resulting bedrock between dropped down along the normal faults, creating the Saguenay Graben.〔 The extent of these faults are only known at the surface and therefore their extension and shape at depth is unknown.〔
The faults associated with the Saguenay Graben have been the source for earthquakes, including the 1988 Saguenay earthquake.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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