Collaborative Proposal: Understanding Subduction Systems by Linking Anisotropic Seismic Imaging and Geodynamic Modeling
合作提案:通过连接各向异性地震成像和地球动力学建模来了解俯冲系统
基本信息
- 批准号:1520694
- 负责人:
- 金额:$ 16.8万
- 依托单位:
- 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
- 起止时间:2015-09-01 至 2018-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Recordings of distant earthquakes will be used in this project to infer the velocity at which the waves traveled beneath the Earth's surface. In turn, we use this information to understand the Earth's structure and, in particular, how subduction (the descent of an old tectonic plate into the Earth's mantle) produces volcanism and affects surface topography. When conducting this type of study, it is currently common to assume that the speed at which the waves travel is independent of their direction. In reality, seismic waves travel at different speeds depending on what their direction is relative to the orientation of minerals in the mantle. This phenomenon is known as anisotropy, and when not taken into account, it can bias the image of the subsurface in ways that can compromise the understanding of the subduction processes. In this project, seismologists will investigate ways to reduce this problem by incorporating physically-based estimates of the distribution of anisotropy into the imaging procedures. In this way, more accurate images of the subsurface will be determined advancing the understanding of how subduction affects the surface, including the distribution of volcanism.The project will combine travel-time tomography, SKS splitting observations and geodynamic flow modeling to produce self-consistent models of mantle structure (isotropic and anisotropic) in the vicinity of two subduction zones. The new approach will allow us to fully integrate mantle anisotropy into teleseismic tomography of subduction zones. By incorporating estimates of the anisotropy field into travel-time tomography the scientitists will significantly reduce major artifacts stemming from the isotropic assumption and obtain a physically-based model for the strain in the mantle wedge and beneath the subducting plate. The improved imaging will allow to better recover the mantle physical state (temperature, composition and melt fraction). This methodology will be applied to existing data from the western Mediterranean and Cascadia subduction zones.
远距离地震的记录将用于这个项目,以推断波在地球表面下传播的速度。反过来,我们利用这些信息来了解地球的结构,特别是俯冲(旧构造板块下降到地幔)如何产生火山活动并影响地表地形。在进行这种类型的研究时,目前通常假设波的传播速度与它们的方向无关。实际上,地震波以不同的速度传播,这取决于它们的方向相对于地幔中矿物的方向。这种现象被称为各向异性,如果不加以考虑,它可能会使地下图像产生偏差,从而影响对俯冲过程的理解。在这个项目中,地震学家将研究如何通过将基于物理的各向异性分布估计纳入成像程序来减少这个问题。通过这种方式,将确定更准确的地下图像,从而促进对俯冲作用如何影响地表的理解,包括火山活动的分布,该项目将结合联合收割机旅行时间层析成像、SKS分裂观测和地球动力学流动模拟,以产生两个俯冲带附近地幔结构(各向同性和各向异性)的自洽模型。新的方法将使我们能够充分整合地幔各向异性到俯冲带的地壳弹性层析成像。通过将各向异性场的估计纳入走时层析成像,科学家们将大大减少源于各向同性假设的主要人为因素,并获得地幔楔和俯冲板块下方应变的物理模型。改进的成像将允许更好地恢复地幔的物理状态(温度,成分和熔体分数)。这种方法将适用于现有的数据从西地中海和卡斯卡迪亚俯冲带。
项目成果
期刊论文数量(2)
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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Douglas Toomey其他文献
Douglas Toomey的其他文献
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{{ truncateString('Douglas Toomey', 18)}}的其他基金
Next-generation 3D imaging of the on- and off-axis mantle and crustal magmatic systems at the Endeavour segment
Endeavour 段的轴上和离轴地幔和地壳岩浆系统的下一代 3D 成像
- 批准号:
1634786 - 财政年份:2016
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
Collaborative Research: Structure and Dynamics of the Lithosphere-Asthenosphere System Beneath the Juan de Fuca Plate
合作研究:胡安德富卡板块下方岩石圈-软流圈系统的结构和动力学
- 批准号:
1333196 - 财政年份:2013
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
Support for the Cascadia Initiative Expedition Team
支持卡斯卡迪亚倡议探险队
- 批准号:
1139701 - 财政年份:2011
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
Acquisition of a Computational Facility, Geological Sciences, University of Oregon
收购俄勒冈大学地质科学计算设施
- 批准号:
0651123 - 财政年份:2007
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
Skew of Mantle Upwelling Beneath the EPR: A Reconsideration of Data and Models
EPR 下方地幔上升流的倾斜:数据和模型的重新考虑
- 批准号:
0732751 - 财政年份:2007
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
Collaborative Research: Testing Models of Magmatic and Hydrothermal Segmentation: A 3-D Seismic Tomography Experiment at the Endeavour Ridge
合作研究:测试岩浆和热液分段模型:奋进山脊的 3-D 地震层析成像实验
- 批准号:
0454747 - 财政年份:2006
- 资助金额:
$ 16.8万 - 项目类别:
Continuing Grant
Collaborative Research: Seismic Studies of the Galapagos Hotspot
合作研究:加拉帕戈斯热点地区的地震研究
- 批准号:
0221549 - 财政年份:2002
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
Collaborative Research: Constraining Mantle Flow, Melt Supply, and Lower Crustal Structure Between the Clipperton and Siqueiros Fracture Zones from a Seismic Undershoot Experiment
合作研究:通过地震下冲实验约束克利珀顿和西凯罗斯断裂带之间的地幔流动、熔体供应和下地壳结构
- 批准号:
0118597 - 财政年份:2001
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
Collaborative Proposal: Geodynamic Tomography: A New Approach to Studies of Mantle Upwelling and its Application to the Lau Basin and The East Pacific Rise
合作提案:地球动力学层析成像:研究地幔上升的新方法及其在劳盆地和东太平洋隆起中的应用
- 批准号:
0002501 - 财政年份:2001
- 资助金额:
$ 16.8万 - 项目类别:
Standard Grant
ITR: Computational Environment Infrastructure with Applications to Mid Ocean Ridge Research: The 'Virtual Research Vessel' Prototype
ITR:计算环境基础设施及其在中海脊研究中的应用:“虚拟研究船”原型
- 批准号:
0081487 - 财政年份:2000
- 资助金额:
$ 16.8万 - 项目类别:
Continuing Grant
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