Collaborative Research: Active, Upper Plate Deformation in Response to Migration of the Panama Triple Junction, Pacific Coast, Panama and Costa Rica

合作研究：巴拿马三重交界处、太平洋沿岸、巴拿马和哥斯达黎加迁移引起的活跃上部板块变形

• 批准号: 0738941
• 负责人: Donald Fisher
• 金额: $ 27.96万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0738941&HistoricalAwards=false
• 关键词: Collaborative; Research; Active; Upper; Plate

This multidisciplinary study of forearc evolution examines the short term (years) and long term (thousands to millions of years) patterns of strain in the upper plate of a subduction zone that straddles the subducting Panama Fracture Zone, an active transform fault. The project goals are to test several hypotheses, including: 1) upper plate deformation is primarily a consequence of indentation tectonics related to Cocos Ridge collision; 2) the Fila Costena thrust belt is propagating laterally into Panama with the migration of the Panama Triple Junction; 3) the velocity field in the upper plate reflects Cocos Ridge collision, including shortening across the Fila Costena, shear/uplift across the onshore projection of the Panama Fracture Zone, and the elastic strain associated with the earthquake cycle. The research team is using structural analyses, Quaternary geologic mapping and dating, and geodetic GPS and modeling studies in an effort to integrate a long-term record of deformation with short-term indicators of kinematics to allow for assessment of rates and styles of deformation of the upper plate. Intersection of the leading edge of the Fila Costena thrust belt with a volcanic debris fan provides excellent timelines to constrain deformation. Radiocarbon and Optically Stimulated Luminescence dating of a superb flight of marine terraces on the Burica Peninsula yield an excellent record of late Quaternary deformation of the peninsula. Geodetic research of strain partitioning will determine the spatial and temporal patterns of short-term elastic strain.Subduction zones are sites of the largest earthquakes on earth, with buildup of elastic strain along the plate boundary until release of this stored energy during earthquakes. By combining short-term and long-term indicators of deformation in the upper plate of the Middle America plate boundary, the elastic or recoverable strain that leads to earthquakes as well as the permanent strain that averages the effects of many earthquakes can be evaluated. This project specifically addresses the coupling attributes of the plate boundary in southern Costa Rica and southwestern Panama, with an assessment of the earthquake hazard of these regions. The project, under the direction of principal investigators from Pennsylvania State University and Trinity University, involves graduate and undergraduate students and scientific collaborations with Costa Rican and Panamanian researchers. The project is supported by the NSF Earth Sciences Division Tectonics Program and the NSF Office of International Science and Engineering.

这项对前臂进化的多学科研究研究了俯冲带的上板的短期（年）和长期（数千至数百万年）的应变模式，该模式跨越了俯冲的巴拿马断裂区，这是一个主动变换。项目目标是检验几个假设，包括：1）上板变形主要是与可口可乐碰撞有关的压痕构造的结果； 2）随着巴拿马三连接的迁移，Fila Costena推力带在横向传播到巴拿马； 3）上板上的速度场反映了可可脊碰撞，包括横跨Fila Costena的缩短，横跨巴拿马断裂区域的陆上投影以及与地震周期相关的弹性菌株。研究团队正在使用结构分析，第四纪地质映射和约会以及大地GPS和建模研究，以努力将变形的长期记录与运动学的短期指标相结合，以允许评估速率和风格的变形和风格。上板。 Fila Costena推力带与火山碎片风扇的前沿相交为限制变形提供了出色的时间表。放射性碳和光学刺激的发光日期在缅甸半岛上出色的海洋梯田飞行产生了半岛晚期变形后期的出色记录。应变分配的大地研究将确定短期弹性应变的空间和时间模式。提取区域是地球上最大地震的部位，沿板界沿板界堆积了弹性应变，直到地震期间释放了这种存储的能量。通过结合中美洲板边界上部板中变形的短期和长期指标，可以评估导致地震的弹性或可回收应变以及平均的永久性应变，即可以评估许多地震的影响。该项目专门针对哥斯达黎加南部和西南巴拿马板边界的耦合属性，并评估了这些地区的地震危险。该项目在宾夕法尼亚州立大学和三一大学的主要研究人员的指导下，涉及研究生和本科生以及与哥斯达黎加和巴拿马研究人员的科学合作。该项目得到了NSF地球科学部构造计划和NSF国际科学与工程办公室的支持。