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首页> 外文期刊>Journal of geodynamics >Crustal deformation due to Alaska-Yakutat collision
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Crustal deformation due to Alaska-Yakutat collision

机译：由于阿拉斯加-雅库塔特碰撞而引起的地壳变形

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摘要

The region of Alaska and adjacent northwest Canada is tectonically active and is subjected to multiple tectonic processes including plate subduction and terrane accretion. These tectonic processes and the forces originating thereof are responsible for high seismicity in the region and deformation of the crust. In the present-day tectonic setting, the Yakutat terrane is obliquely colliding with Alaska along the Aleutian Trench. Also, flat subduction due to under thrusting of a thickened crust, probably of oceanic affinity, is contributing to the tectonic evolution of this region in a basal traction collision style. This study uses the 2D, planform, thin-viscous-sheet model to investigate the effect of the Yakutat terrane colliding with Alaska and adjacent northwest Canada. Along with the obliquity and velocity of convergence, the lateral strength heterogeneities in the crust are considered in this investigation. The results of the numerical model are constrained with the observed topography and stress orientation in Alaska. It is shown that the Alaska-Yakutat collision is producing asymmetric deformation of the crust with respect to the normal to the collision boundary and that lateral strength heterogeneities contribute significantly to the deformation of the crust. Also, the influence of this collision can be observed up to a distance of ～700 km inland from the collision boundary.
机译：阿拉斯加地区和加拿大西北部邻近地区构造活跃，经历了多种构造过程，包括板块俯冲和地层增生。这些构造过程及其产生的力导致该区域的高地震活动和地壳变形。在当今的构造环境中，Yakutat地形沿阿留申海沟倾斜地与阿拉斯加相撞。而且，由于增厚的地壳的下推作用而造成的平面俯冲作用，可能是海洋亲缘关系，以基底牵引碰撞方式促进了该地区的构造演化。这项研究使用2D平面薄粘片模型来研究Yakutat地形与阿拉斯加和加拿大西北部相撞的影响。除了倾角和收敛速度外，本研究还考虑了地壳横向强度的异质性。数值模型的结果受阿拉斯加观测到的地形和应力方向的约束。结果表明，阿拉斯加-雅库塔特（Aakuka-Yakutat）冲撞相对于冲撞边界的法线正在产生地壳的不对称变形，并且横向强度的不均匀性显着地促进了地壳的变形。另外，从碰撞边界到内陆约700 km的距离，都可以观察到这种碰撞的影响。

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