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.

该提案要求支持格陵兰地壳和上层地幔的整合地球物理研究。该研究旨在表征格陵兰地壳和上地幔的地震速度结构在三个维度上。为了将这些结果与重力和热流数据相结合，实验室材料特性的估计以及岩石学数据以绘制温度，组成和热通量的变化。该项目将利用来自NSF和国际资助的GLISN地震网络的地震数据，并在有限数量的临时密封站以有针对性的数据收集来补充。拟议的研究将极大地提高人们对格陵兰的地壳和地幔结构的理解，这种结构随着时间的流逝而演变的方式及其对冰冻层和固体地球中现代地球物理过程的影响。这项研究的结果将为冰盖模型和冰川等静态调整模型提供重要的投入。两种模型的准确性对于准确预测海平面上升至关重要。这项研究的发现将与了解全球大陆集会和保存有关。该项目中得出的地震模型还将允许改进构造和冰川地震的来源参数的估计值。原始数据和衍生数据产品将通过IRIS和UNAVCO档案公开获得。通过该项目生产的教育材料将用于一般用途，项目外展工作将支持美国 - 绿地教育合作伙伴关系。该项目将培训一名研究生和2至3名本科生。