Collaborative Research: Implications of Active Tectonics in Morocco for the Kinematics and Dynamics of Africa-Eurasia Plate Interactions in the Western Mediterranean

合作研究：摩洛哥活动构造对西地中海非洲-欧亚板块相互作用的运动学和动力学的影响

• 批准号: 0408728
• 负责人: Robert Reilinger
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0408728&HistoricalAwards=false
• 关键词: Collaborative; Research; Implications; Active; Tectonics

This project is using Global Positioning System (GPS) repeat observations, and Interferometric Synthetic Aperture Radar (InSAR) to monitor active deformation in Morocco associated with ongoing "collision" of the African plate with Iberia (Eurasia). Additionally, neotectonic and paleoseismic studies are helping better determine the relation between ongoing deformation, earthquake generation, and the development of geologic structures. Toward these ends, the investigators are upgrading three continuous GPS (CGPS) stations (Rabat, Tetouan, Ifrane) and establishing a new CGPS station near Agadir. These stations provide highly precise estimates of Africa (Nubia) plate motion as well as strong constraints on intraplate deformation, including anticipated shortening across the Atlas Mountains in central Morocco. In addition, the Moroccan CGPS network provides a framework for integrating survey-mode GPS observations that provide dense coverage to isolate individual, active structures. The relationship between interseismic deformation (as recorded by GPS and InSAR) and the earthquake cycle are being investigate with paleoseismic techniques. A major focus of our work is the Rif Mountains in northwestern Morocco that exhibit rapid SW motions relative to the African plate as a whole. GPS and InSAR measurements are better defining the special and temporal character of these anomalous motions. Using the improved deformation results, quantitative models to test extrusion models (crust being squeezed out of the collision zone) as well as models of crustal deformation associated with dynamic processes in the mantle (active subduction, lithospheric delamination) are being developed.

该项目利用全球定位系统重复观测和干涉合成孔径雷达（干涉合成孔径雷达）监测非洲板块与伊比利亚（欧亚大陆）持续“碰撞”引起的摩洛哥活跃变形。 此外，新构造和古地震研究有助于更好地确定正在进行的变形、地震发生和地质构造发展之间的关系。 为此目的，调查人员正在更新三个连续的全球定位系统（CGPS）站（拉巴特、得土安、伊夫兰），并在阿加迪尔附近建立一个新的CGPS站。 这些观测站提供了对非洲（努比亚）板块运动的高度精确的估计，以及对板内变形的强有力的限制，包括预期的横跨摩洛哥中部阿特拉斯山脉的缩短。 此外，摩洛哥CGPS网络还提供了一个整合测量模式GPS观测的框架，这些观测提供密集的覆盖范围，以隔离单个活动结构。 正在利用古地震技术研究震间变形（如GPS和干涉合成孔径雷达记录的）与地震周期之间的关系。 我们工作的一个主要焦点是摩洛哥西北部的里夫山脉，该山脉相对于整个非洲板块表现出快速的SW运动。 GPS和干涉合成孔径雷达测量较好地确定了这些异常运动的空间和时间特征。 利用改进的变形结果，正在开发测试挤压模型（地壳被挤出碰撞区）的定量模型以及与地幔动力学过程（主动俯冲、岩石圈拆沉）有关的地壳变形模型。