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Investigating tomographic resolution in global crustal imaging

Investigating tomographic resolution in global crustal imaging
研究全球地壳成像中的层析分辨率
批准号:
1348131
负责人:
Ying Zhou
金额:
$9.2万
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
2015
资助国家:
美国
项目状态:
已结题
起止时间:
2015-05-01 至 2017-07-31

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中文摘要
翻译
地壳的地震结构对于了解大陆和海洋盆地的形成和演化具有重要意义。目前全球地壳模型的分辨率受到高度不均匀数据复盖率的限制,因为折射和反射实验和接收函数分析在海洋区域和偏远的大陆内部很稀少。与其他地震数据集相比,地震面波可以用来更好地在全球范围内约束地壳结构,因为它们在地球的外壳中传播,并提供最佳的空间复盖。然而,在全球地壳层析成像中理解面波的横向和垂直分辨率仍然是一个挑战。这项研究将把莫霍面成像的有限频率理论的发展和用谱元方法模拟波的传播结合起来,研究射线理论和有限频率理论在全球地壳结构面波层析成像中的分辨率极限。PI将发展基于行波模式耦合的有限频率理论来成像各向异性介质中的莫霍面地形,并研究基于相速度敏感核的非线性全球地壳层析成像的分辨率极限。该小组将量化全球地壳模型中绕射效应的尺度依赖性,以及与层析成像理论中的近似和不完善的全球数据复盖率相关的分辨率限制。波速和莫霍面地形的权衡将在不连续地形和波速结构的联合反演中进行分析。
英文摘要
Seismic structure of the Earth's crust is important for the understanding of the formation and evolution of continents and ocean basins. The resolution of current global crustal models are limited by highly inhomogeneous data coverage as refraction and reflection experiments and receiver function analysis are sparse in oceanic regions and remote continent interiors. Seismic surface waves can be potentially used to better constrain crustal structure at a global scale as they propagate in the outer shell of the earth and provide best spatial coverage compared with other seismic data sets. However, understanding the lateral and vertical resolution of surface waves in global crustal tomography remains a challenge. This research will integrate development of finite-frequency theory for Moho discontinuity imaging and wave propagation simulations using the Spectral Element Method to investigate resolution limits of ray theory and finite-frequency theory in surface-wave tomography of global crustal structure.The PI will develop finite-frequency theory based on travelling-wave mode coupling for imaging the Moho discontinuity topography in anisotropic media and investigate resolution limits in non-linear global crustal tomography based on phase-velocity sensitivity kernels. The team will quantify the scale-dependence of diffractional effects in global crustal models as well as resolution limits associated with approximations in tomographic theory and imperfect global data coverage. The tradeoff between wavespeed and Moho topography will be analyzed in joint inversions of discontinuity topography and wavespeed structure.
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会议论文
Finite-frequency Imaging of the Mantle Transition Zone Discontinuities
High-resolution Imaging of the Mantle Transition Zone using EarthScope USArray
CSEDI: Testing Resolution of Deep Earth Seismic Structure Under the Pacific Using Geodynamic Models
Mapping elastic and anelastic structure in the global upper mantle
国内基金
海外基金
基于Tomographic TR-PIV 技术的液固两相湍流边界层拟序结构的实验研究
  • 批准号:
    11572357
  • 项目类别:
    面上项目
  • 资助金额:
    92.0万元
  • 批准年份:
    2015
  • 负责人:
    陈文义
  • 依托单位:
基于Tomographic PIV技术的湍流边界层拟序结构研究
  • 批准号:
    11102013
  • 项目类别:
    青年科学基金项目
  • 资助金额:
    28.0万元
  • 批准年份:
    2011
  • 负责人:
    高琪
  • 依托单位: