COLLABORATIVE RESEARCH: Geologic and GPS Study: DisplacementPartitioning and Arc-Parallel Extension in the Aleutian Volcanic Island Arc

9714887 Oldow在两个板块之间的辐合矢量向缝合线倾斜的情况下，变形被划分为弧平行（走滑）和弧正（逆冲）分量。控制这种分区的参数还不是很清楚，存在几种模型。这项在阿留申弧的研究利用了板块之间的弯曲缝线，其中矢量从近0度（正交）平滑地变化到近90度（纯走滑），以解决一些可能的参数。如果上下板之间的耦合保持不变，则应观察到上板的弧平行延伸随着倾角的增加而增加。然而，如果耦合随着倾角的增加而减小，则不需要发生弧平行延伸。该项目将采用GPS技术来确定阿留申弧沿线岛屿的平移，并通过结构分析来确定有效滑动和变形响应。结果应记录随倾角增加的应变分配，确定操作滑动机制，并允许在收敛向量斜向板边缘的情况下测试关于分配的几种假设。

9714887 Oldow In circumstances where the convergence vector between two plates is oblique to the suture, deformation is partitioned into arc-parallel (strike-slip) and arc normal (thrust) components. The parameters controlling this partitioning are not well known, and several models exist. This research in the Aleutian arc takes advantage of a curved suture between plate where the vector varies smoothly from near O (orthogonal) to near 90o (pure strike-slip) to address some of the possible parameters. If the coupling between upper and lower plates remains constant, increasing arc-parallel extension in the upper plate with increasing obliquity should be observed. However, no arc-parallel extension need occur if coupling decreases with increasing obliquity. This project will employ GPS technology to determine translations of the islands along the Aleutian arc and structural analysis to determine operative slip and deformation response. Results should document partitioning of strain with increasing obliquity, identify operative slip mechanisms and allow testing of several hypotheses about partitioning in situation where convergent vectors are oblique to plate margins.