Collaborative Research: Investigating the limits of ray-based global surface-wave tomography
合作研究:研究基于射线的全局表面波断层扫描的局限性
基本信息
- 批准号:0910803
- 负责人:
- 金额:$ 9.48万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2009
- 资助国家:美国
- 起止时间:2009-10-01 至 2012-09-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This project involves an investigation of different technical approaches used to image the Earth's interior. Much of what is known about the structure, composition and temperature of the deep Earth comes from mapping of elastic properties using seismic waves from earthquakes recorded on hundreds of seismic stations distributed worldwide. All of the computational tools and techniques used to image the deep Earth are approximate, and significant uncertainty exists concerning the accuracy and precision of models that are the result of so-called seismic tomography. This project uses synthetic data sets, generated using a highly accurate computer code and a prescribed Earth structure, and standard analysis techniques to image the interior structure using the synthetic data. Comparison of the prescribed and recovered Earth structures allows the true resolution of common analysis techniques to be investigated and quantified. The project aims to develop guidelines for the applicability and limitations of different techniques.Large data sets of long-period seismograms for a suite of Earth models with different elastic and anelastic characteristics are generated using the spectral-element method. Realistic distributions of earthquakes and seismic stations are used to mimic real conditions, and earthquake mechanisms are determined directly from the data. Surface-wave propagation anomalies are measured from the data with standard techniques, and the anomalies are interpreted in terms of Earth structure employing methods of different levels of theoretical and computational complexity. In particular, the performance of ray theory and two-dimensional and three-dimensional Born scattering approaches are compared for different three-dimensional Earth models.
该奖项是根据2009年美国复苏和再投资法案(公法111-5)资助的。该项目涉及对用于地球内部成像的不同技术方法的调查。关于地球深部的结构、组成和温度的大部分知识来自于利用分布在世界各地的数百个地震台站记录的地震波绘制的弹性特性图。用于对地球深部进行成像的所有计算工具和技术都是近似的,在所谓的地震层析成像所产生的模型的准确性和精确度方面存在很大的不确定性。该项目使用合成数据集,这些数据集是使用高度精确的计算机代码和规定的地球结构生成的,并使用标准分析技术,利用合成数据对内部结构进行成像。规定的和恢复的地球结构的比较允许真正的解决方案的共同分析技术进行调查和量化。该项目旨在为不同技术的适用性和局限性制定准则,利用谱元法生成一套具有不同弹性和滞弹性特性的地球模型的长周期地震图的大数据集。地震和地震台站的真实分布被用来模拟真实的条件,地震机制直接从数据中确定。面波传播异常测量的数据与标准技术,并解释异常的地球结构,采用不同层次的理论和计算复杂性的方法。特别是,射线理论和二维和三维玻恩散射方法的性能进行了比较,为不同的三维地球模型。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Colleen Dalton其他文献
Colleen Dalton的其他文献
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{{ truncateString('Colleen Dalton', 18)}}的其他基金
Collaborative Research: Towards a new framework for interpreting mantle deformation: integrating theory, experiments, and observations spanning seismic to convective timescales
合作研究:建立解释地幔变形的新框架:整合从地震到对流时间尺度的理论、实验和观测
- 批准号:
2218542 - 财政年份:2022
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
Seismological studies of cratonic lithosphere: investigating lithospheric rheology, heat flow beneath ice sheets, and the origin of mid-lithospheric discontinuities
克拉通岩石圈的地震学研究:研究岩石圈流变学、冰盖下的热流以及岩石圈中部不连续面的起源
- 批准号:
2044136 - 财政年份:2021
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
Tectonic control of the carbon cycle and climate: Resolving the effects of global spreading-rate variations with high temporal resolution over the past 20 Myr
碳循环和气候的构造控制:以高时间分辨率解决过去20马里全球扩散率变化的影响
- 批准号:
1737109 - 财政年份:2017
- 资助金额:
$ 9.48万 - 项目类别:
Standard Grant
CAREER: Illuminating the Tectonic History of North America with Seismic Models of Shear Attenuation and Velocity
职业:用剪切衰减和速度的地震模型阐明北美的构造历史
- 批准号:
1553367 - 财政年份:2016
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
High-resolution seismic models of the upper mantle beneath the Indian Ocean
印度洋下上地幔的高分辨率地震模型
- 批准号:
1435751 - 财政年份:2014
- 资助金额:
$ 9.48万 - 项目类别:
Standard Grant
Collaborative Research: Investigating Temperature, Melting, and Mantle Flow in the North American Upper Mantle with 3-D Models of Shear Velocity, Radial Anisotropy, and Attenuation
合作研究:利用剪切速度、径向各向异性和衰减的 3D 模型研究北美上地幔的温度、熔化和地幔流动
- 批准号:
1444421 - 财政年份:2014
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
Collaborative Research: Surface wave and body wave modeling of attenuation in the mantle transition zone
合作研究:地幔过渡区衰减的表面波和体波建模
- 批准号:
1444432 - 财政年份:2014
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
Collaborative Research: Investigating Temperature, Melting, and Mantle Flow in the North American Upper Mantle with 3-D Models of Shear Velocity, Radial Anisotropy, and Attenuation
合作研究:利用剪切速度、径向各向异性和衰减的 3D 模型研究北美上地幔的温度、熔化和地幔流动
- 批准号:
1252069 - 财政年份:2013
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
Collaborative Research: Surface wave and body wave modeling of attenuation in the mantle transition zone
合作研究:地幔过渡区衰减的表面波和体波建模
- 批准号:
0944148 - 财政年份:2011
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
Collaborative Research: Variations in Upper-Mantle Temperature, Deformation, and Melting Inferred from the Seismic Structure of the Atlantic Basin
合作研究:从大西洋盆地地震结构推断上地幔温度、变形和熔化的变化
- 批准号:
0838180 - 财政年份:2009
- 资助金额:
$ 9.48万 - 项目类别:
Continuing Grant
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