COLLABORATIVE RESEARCH: Geologic and GPS Strain Study: Displacement Partitioning and Arc-Parallel Extension in the Aleutian Volcanic Arc

合作研究：地质和 GPS 应变研究：阿留申火山弧的位移分区和弧平行延伸

• 批准号: 9714906
• 负责人: Hans Ave Lallemant
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714906&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Geologic; GPS; Strain

9714906 AveLallemant 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.

小行星9714906 在两个板块之间的会聚矢量是斜向缝合线的情况下，变形分为弧平行（走滑）和弧正常（逆冲）的组成部分。 控制这种划分的参数并不为人所知，存在几种模型。 阿留申岛弧的这项研究利用了板块之间的弯曲缝合线，其中矢量从近O（正交）到近90 o（纯走滑）平滑变化，以解决一些可能的参数。 如果上板和下板之间的耦合保持恒定，则应观察到上板中的弧平行延伸随着结晶度的增加而增加。 然而，如果耦合随着倾斜度的增加而减小，则不需要发生弧平行延伸。 该项目将采用全球定位系统技术来确定阿留申岛弧沿着岛屿的平移，并进行结构分析来确定有效滑动和变形响应。 结果应记录分区的应变增加的结晶度，确定操作滑动机制，并允许测试的几个假设分区的情况下，收敛向量是倾斜的板块边缘。