Geophysical constraints on the crust and upper-mantle structure of Greenland

格陵兰岛地壳和上地幔结构的地球物理约束

• 批准号: 1304346
• 负责人: Meredith Nettles
• 金额: $ 54.54万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1304346&HistoricalAwards=false
• 关键词: Geophysical; constraints; crust; upper; mantle

This proposal requests support for an integrated geophysical study of the crust and upper mantle of Greenland. The study aims to characterize the seismic velocity structure of Greenland's crust and upper mantle in three dimensions; and to integrate these results with gravity and heat-flow data, laboratory estimates of material properties, and petrological data to map variations in temperature, composition, and heat flux. The project would make use of seismic data from the NSF- and internationally funded GLISN seismic network, supplemented by targeted collection of data at a limited number of temporary PASSCAL stations. The proposed research will lead to a greatly improved understanding of the crust and mantle structure of Greenland, the way this structure has evolved with time, and its influence on modern-day geophysical processes in the cryosphere and solid Earth. The results of this study will provide important inputs for ice-sheet models and models of glacial isostatic adjustment. The accuracy of both types of models is critical for accurate predictions of sea-level rise. The findings of this study will be relevant for understanding continental assembly and preservation worldwide. The seismological models derived in this project will also allow improved estimates of source parameters for tectonic and glacial earthquakes. Raw data and derived data products will be publicly available through the IRIS and UNAVCO archives. The educational materials produced through this project will be available for general use, and project outreach efforts will support U.S.-Greenland partnership in education. The project will train one graduate student and 2 to 3 undergraduate students.

这项建议要求支持对格陵兰地壳和上地幔进行综合地球物理研究。该研究旨在描述格陵兰地壳和上地幔三维地震速度结构的特征;并将这些结果与重力和热流数据、材料性质的实验室估计和岩石学数据相结合，以绘制温度、成分和热通量的变化。该项目将利用美国国家科学基金会和国际资助的全球LISN地震网络的地震数据，并辅之以在数量有限的临时PASSCAL台站有针对性地收集数据。拟议的研究将大大提高对格陵兰地壳和地幔结构的认识，这种结构随着时间的推移而演变的方式，以及它对冰冻圈和固体地球中现代地球物理过程的影响。研究结果将为冰盖模型和冰川均衡调整模型提供重要的输入。这两种模型的准确性对于准确预测海平面上升至关重要。这项研究的结果将有助于了解世界各地的大陆组装和保护。该项目中导出的地震学模型还将改进对构造地震和冰川地震的震源参数的估计。原始数据和衍生数据产品将通过综合资源信息系统和联阿援助团档案公开提供。通过该项目制作的教育材料将可供一般使用，项目外展工作将支持美国-格陵兰教育伙伴关系。该项目将培养1名研究生和2至3名本科生。