CSEDI: Collaborative Research: Toward a Comprehensive Model of Mantle Flow & Seismic Anisotropy in the Western US - Using Mineral Physics to Directly link Geodynamics & Se

CSEDI：合作研究：建立地幔流综合模型

• 批准号: 0330755
• 负责人: Donna Blackman
• 金额: $ 17.33万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0330755&HistoricalAwards=false
• 关键词: CSEDI; Collaborative; Research; Toward; Comprehensive

Quantifying the relationship between seismic anisotropy and mantle flow is important for advancing our understanding of surface tectonics and convection in the Earth's mantle. The investigators propose a joint approach: to calculate regional geodynamic flow models, compare derived finite strain to mineral physics calculations of texture, and perform seismological modeling to find both strain and texture predictions for anisotropy that are compatible with observations. They strive to answer the following questions: How are strain, mantle flow, and anisotropy related, in orientation and in magnitude? To what degree are deep convective currents coupled to the lithosphere? Can results from laboratory deformation experiments be applied to the behavior of the mantle at much lower strain rates? The western United States are an ideal natural test-bed for this project since the density of seismic and geodetic data is one of the highest worldwide, allowing for good lateral and depth resolution, which will increase further during the Earthscope efforts. The proposed study will also be useful for planning the future deployment of seismic instrumentation, in particular within the western United States plate boundary region. Funding will provide support for two female PIs and for the career development of two junior researchers working on a self-directed project. At the end of the funding period, the PIs expect to provide the community with a real-world test of texture formation algorithms and strain-anisotropy relationships, and with a quantitative guide to the interpretation of seismological observations of anisotropy with respect to geodynamics.

量化地震各向异性和地幔流之间的关系对于增进我们对地幔表面构造和对流的理解非常重要。研究人员提出了一种联合方法：计算区域地球动力流模型，将导出的有限应变与纹理的矿物物理计算进行比较，并进行地震建模以找到与观测结果兼容的各向异性的应变和纹理预测。他们努力回答以下问题：应变、地幔流和各向异性在方向和大小方面如何相关？ 深对流与岩石圈的耦合程度如何？ 实验室变形实验的结果是否可以应用于地幔在低得多的应变率下的行为？美国西部是该项目理想的天然试验场，因为地震和大地测量数据的密度是世界上最高的之一，具有良好的横向和深度分辨率，在 Earthscope 工作期间，这种分辨率将进一步提高。拟议的研究还将有助于规划地震仪器的未来部署，特别是在美国西部板块边界区域内。资金将为两名女性 PI 和两名从事自主项目的初级研究人员的职业发展提供支持。在资助期结束时，PI 希望为社区提供纹理形成算法和应变各向异性关系的真实世界测试，并提供解释地震各向异性与地球动力学观测结果的定量指南。