EAGER: Collaborative Research: A New Approach to Imaging Mantle Discontinuity Structure with USArray

EAGER：合作研究：利用 USArray 对地幔不连续结构进行成像的新方法

• 批准号: 1247825
• 负责人: Matthew Fouch
• 金额: $ 0.31万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1247825&HistoricalAwards=false
• 关键词: EAGER; Collaborative; Research; New; Approach

The goal of this project is to develop new methods of analyzing seismic data from densely spaced seismometer arrays, such as EarthScope?s USArray. A key seismological tool for answering the fundamental question of how the mantle circulates is the imaging of seismic discontinuities that are sensitive to the thermal and chemical properties of the mantle. The wealth of data provided by EarthScope allows geoscientists to study the structure of seismic discontinuities on a scale and at a level of detail that have never been possible before. The first phase of this project is funded by the EArly-concept Grants for Exploratory Research (EAGER) program, bringing together a team of seismologists with a broad range of expertise that is led by Dr. Nicholas Schmerr at the University of Maryland and Goddard Space Flight Center. The team is developing a new algorithm and suite of computational tools to analyze seismic energy that reflects from the topside of a seismic discontinuity, providing detailed upper mantle discontinuity structure at scale lengths of several hundred kilometers or less. This tool requires the use of array methodologies enabled by the dense station spacing of the USArray. Development of this new data analysis methodology should stimulate fundamental advances in understanding of the mantle in the fields of mineral physics, mantle petrology, seismology, and geodynamics, adding to the richness of information on the geological history of the mantle beneath the North American continent. The project is providing next-generation open-source scientific research tools, datasets, and measurements made freely available to the scientific community to empower a broader cross section of scientists to handle large datasets such as those provided by EarthScope. These newly developed seismological tools and discontinuity models are being disseminated to the scientific community through the PI?s website.

该项目的目的是开发新的方法来分析来自地震计阵列（例如EarthScope's Usarray）的地震数据。 回答地幔如何循环的基本问题的关键地震学工具是对地震敏感的地震不连续性的成像。 Earthscope提供的大量数据使地球科学家能够以一定程度的细节研究地震不连续性的结构。该项目的第一阶段是由探索性研究（急切）计划的早期概念赠款资助的，将一组具有广泛专业知识的地震学家组成，由马里兰大学和戈达德太空飞行中心的Nicholas Schmerr博士领导。 该团队正在开发一种新的算法和计算工具套件，以分析地震能量，这反映了地震不连续性的顶部，以几百公里或更小的规模长度提供了详细的上层地幔不连续结构。该工具需要使用USARRAY密集的站间距启用的数组方法。这种新数据分析方法的开发应刺激理解矿物质，地幔岩石学，地震学和地球动力学领域的地幔的基本进步，从而增加了有关北美大陆地幔地质历史的丰富信息。该项目正在提供下一代开源科学研究工具，数据集以及对科学界自由使用的测量值，以增强科学家的更广泛的横截面，以处理大型数据集，例如Earthscope提供的数据集。这些新开发的地震工具和不连续性模型正在通过PI的网站传播到科学界。