EAGER: Vectorial Anisotropic Body and Surface Wave Tomography Using USArray Data

EAGER：使用 USArray 数据进行矢量各向异性体和表面波断层扫描

• 批准号: 1154039
• 负责人: Mark Panning
• 金额: $ 17.83万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-03-01 至 2014-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1154039&HistoricalAwards=false
• 关键词: EAGER; Vectorial; Anisotropic; Body; Surface

Robust modeling of both strength and orientation of anisotropicstructure is a tantalizing tool for constraining the dynamic processes in the lithospheric andsub-lithospheric mantle beneath North America, directly meeting the Earthscope goals of understandingthe active deformation of North America and tying it to deep Earth structure anddynamics. The long term goal of this research is to develop more detailed regional and globalmodels of seismic anisotropy that can both illuminate the dynamic processes of the upper mantle,as well as allowing for direct comparison with geodynamically predicted models. Theobjective of this EAGER application, which is the next step towards this long-term goal, is todevelop a new approach to image dynamic processes in the lithospheric and sub-lithosphericmantle beneath North America with a novel technique combining both body wave and surfacewave observables that allows for finite-frequency vectorial tomography. The international collaborationproposed here is uniquely suited to bring these approaches the PI and the researchgroup of S´ebastien Chevrot have been working on together and take advantage of the incredibledataset offered by the USArray transportable array to move towards obtaining an unprecedentedmodel of anisotropic structure beneath North America. The project will develop these modelsby pursuing the following specific aims. 1) Perform synthetic testing of joint inversions usingthis new approach. The inversions will allow us to gain unprecedented information about bothstrength and orientation of anisotropy. 2) Assemble and process USArray shear splitting andsurface wave data and merge and improve existing software between the two research groups.Dense data coverage of both splitting intensity and multi-taper fundamental mode phase delaywill be possible, and since both approaches have been developed from a consistent elastic parameterization,merging the software and performing joint inversions of the data shows greatpotential for greatly improving the capabilities of anisotropic modeling.

对各向异性结构的强度和方向的鲁棒建模是一种约束北美岩石圈和亚岩石圈地幔动力学过程的诱人工具，直接满足Earthscope的目标，即了解北美的活动变形并将其与地球深部结构和动力学联系起来。这项研究的长期目标是开发更详细的区域和全球地震各向异性模型，既可以阐明上地幔的动力学过程，也可以与地球动力学预测模型进行直接比较。这个EAGER应用程序的目标，这是朝着这个长期目标的下一步，是开发一种新的方法来图像动力学过程中的岩石圈和sub-lithosphere地幔下北美与一种新的技术相结合的体波和表面波可观的，允许有限频率矢量层析成像。这里提出的国际合作非常适合将PI和S 'ebastien Chevrot的研究小组一直在共同研究的这些方法，并利用USAray可移动阵列提供的合理数据集，以获得北美地下各向异性结构的前所未有的模型。该项目将通过追求以下具体目标来开发这些模型。1)使用这种新方法进行联合反演的合成测试。反演将使我们获得有关各向异性强度和方向的前所未有的信息。2)收集和处理美国阵列剪切分裂和表面波数据，合并和改进两个研究小组之间现有的软件。分裂强度和多锥度基模相位延迟的密集数据覆盖将是可能的，并且由于这两种方法都是从一致的弹性参数化发展而来的，合并软件和执行数据的联合反演显示了极大提高各向异性建模能力的巨大潜力。