ARC-ARC COLLISION BY THE EXAMPLE OF THE ALEUTIAN AND KAMCHATKA ISLAND ARCS
A.I. Kozhurin1,2, T.K. Pinegina2
1Institute of Volcanology and Seismology of Far Eastern Branch of RAS, Russia
2Geological Institute of RAS, Moscow, Russia
Keywords: Kamchatka, Aleutian Arc, arc-arc collision, active faults
Abstract
The article presents data on active faulting in the Kamchatsky Peninsula (Kamchatka, Russia) located between the converging Aleutian and Kamchatka Island arcs. Convergence of the arcs leads to shortening of the Kamchatsky Peninsula, transverse to Kamchatka, and is accomplished by underthrusting of the blocks involved in the collision – of the Aleutian Arc under the Kamchatsky Peninsula and that of the Kamchatsky Peninsula under Kamchatka. It is shown that underthrusting as the way absorbing convergence is also characteristic for larger collision zones, as in case of collision of the Indian and Arabian plates with the Eurasian plate. In all the cases, the plate (block) underthrusts, in the rear of which there is a source of movements.
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