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Baikal Rift Zone
The Baikal Rift Zone is a divergent plate boundary centered beneath Lake Baikal in southeastern Russia. Along it form a series of basins more than long. To its west is the Eurasian Plate and the Siberian platform and to its east is the Amur Plate which is moving away from the rift toward Japan at about 4 mm per year.
== Extent ==
As in all divergent plate boundary zones, the crust in the Baikal Rift Zone is thinning and magma is very close to the surface. Hot springs are present both on land and under Lake Baikal, although thus far, no evidence of actual volcanism has been found in the immediate vicinity of the lake. However, geologically-recent volcanic activity has occurred nearby and is probably associated with the Baikal Rift Zone. These volcanic centers are the Udokan Plateau, located about 400 km ENE of the northern tip of Lake Baikal, the Oka Plateau, located about 200 km WNW of the southwest tip of Lake Baikal, and the Vitim Plateau, around 200 km east of the rift.
Not all forces within the system form a divergent plate boundary, some strike-slip movement occurs in the fault system.
The driving forces of the rift are unknown; however, possibilities include the subduction of the Pacific Plate and the collision of the Indian subcontinent with Eurasia. Locally, there may be a mantle up-welling driving the extension.〔
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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