Tectonic Escape of the Panama Microplate? Kinematics Along the Western Boundary, Costa Rica

巴拿马微板块的构造逃逸？

• 批准号: 9214832
• 负责人: Thomas Gardner
• 金额: $ 12.85万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9214832&HistoricalAwards=false
• 关键词: Tectonic; Escape; Panama; Microplate; Kinematics

Plate tectonics provides a conceptual framework for placing a number of structural features in rather specific tectonic settings, however the effects of second-order variations are not well constrained. This project will examine the possible effects of aseismic ridge subduction on an active system of faults in Panama. Presently, two hypotheses are viable- the deformation is due to "escape tectonics" resulting in Cocos Ridge penetration or the deformation is due simply to the west end of the Panama microplate, unrelated to the Cocos Ridge. These models will be tested by measuring displacements of Quaternary terraces and volcanic flows, structural studies of faults, and analysis of focal plane earthquake mechanisms. Each model predicts different spatial distributions of faults, different timing and styles of deformation. Results will help understand microplate boundaries and interactions in the western Caribbean/Central America area and are expected to apply to microplate tectonics in other areas.

板块构造学提供了一个概念框架， 将一些结构特征置于相当具体的 构造环境，然而，二阶效应 变化没有得到很好的限制。 该项目将 研究海岭俯冲可能对 巴拿马的一个活动断层系统 目前，两名 假设是可行的-变形是由于“逃逸 “构造”导致科科斯脊渗透或 巴拿马河的伦敦西区 与科科斯山脊无关的微板 这些模型将 通过测量第四纪阶地的位移来检验 和火山流，断层的结构研究， 震源机制分析。 每个模型 预测断层的不同空间分布， 不同的变形时间和方式。 结果将 有助于理解微孔板的边界和相互作用， 西加勒比/中美洲地区，预计 应用于其他领域的微板块构造。