Geomorphic Evidence for Crustal Uplift Adjacent to a Subducting Aseismic Ridge, Pacific Coast of Costa Rica

该奖项将提供部分支持教授。托马斯加德纳的 宾夕法尼亚州立大学在科斯塔休假 Rica将计算从河流阶地确定的抬升速率 沿着哥斯达黎加西北部的层序， 将这些数据与板块构造模型联系起来， 毗邻亚速尔群岛的科科斯山脊 研究应提供 “正常”地壳抬升速率的关键数据 俯冲期间哥斯达黎加西北部的俯冲 位于哥斯达黎加东南部的科科斯海岭。 拟建场地 为确定所需的构造提供了理想的位置 数据，因为该地区的板块构造历史是 众所周知。 有浮力的海洋岩石圈以海洋 高原，海隆脊，或非常年轻的岩石圈可能是 导致板块沿着会聚的异常构造活动 边界 虽然后一种活动可以广义地理解， 其具体原因和数量仍然主要是 没有地址 太平洋沿岸的哥斯达黎加代表了 一个无与伦比的网站，研究其中一个特定的案例， 现象：地壳的垂直运动在接近一个 包含海隆脊的俯冲洋岩石圈。 这项研究是NSF支持的一项更大研究的一部分， 将涉及国家地理研究所的科学家， 哥斯达黎加大学和哥斯达黎加大学 电力 特别是， 哥斯达黎加大学将正式参与该领域 工作 通过让来自哥斯达黎加的科学家密切参与 研究，这个奖项有助于推进的目标， 发展中国家科学计划。

This award will provide partial support to Prof. Thomas Gardner of The Pennsylvania State University for a sabbatical stay in Costa Rica to calculate uplift rates determined from fluvial terrace sequences along the northwestern portion of Costa Rica and to relate that data to the plate tectonic model for subduction of the adjacent aseismic Cocos Ridge. The research should provide critical data on crustal uplift rates resulting from "normal" subduction in northwestern Costa Rica during the time of subduction of the Cocos Ridge in southeastern Costa Rica. The proposed site provides the ideal location for determining the needed tectonic data because the Quatenary plate tectonic history of the region is well known. The subduction of buoyant, ocean lithosphere in the form of oceanic plateaus, aseismic ridges, or very young lithosphere may be responsible for anomalous tectonic activity along convergent plate boundaries. While the latter activity may be broadly understood, its specific causes and quantifications remain largely unaddressed. The Pacific coast of Costa Rica represents an unsurpassed site for a study of one specific case among these phenomena: the vertical motions of the crust in proximity to a subducting oceanic lithosphere that contains an aseismic ridge. This study, which is part of a larger study supported by the NSF, will involve scientists from the Instituto Geografico Nacional, the Universidad de Costa Rica, and the Instituto Costarricense de Electricidad. In particular, Prof. Ana Chinchilla of the Universidad de Costa Rica will formally participate in the field work. By closely involving scientists from Costa Rica in the research, this award serves to advance the objectives of the Science in Developing Countries Program.