CSEDI collaborative research: a multidisciplinary approach to investigate the origin of anisotropy at the base of the mantle
CSEDI 合作研究:采用多学科方法研究地幔底部各向异性的起源
基本信息
- 批准号:1067513
- 负责人:
- 金额:$ 38.32万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2011
- 资助国家:美国
- 起止时间:2011-09-01 至 2015-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Seismic anisotropy (i.e. seismic waves travel in different directions at different speeds) in the deeper earth was discovered in the mid-sixties and was soon interpreted in a qualitative way as a result of crystal alignment during convection (LPO). This concept since became generally accepted. More recently strong anisotropy and heterogeneity was documented in the lowermost mantle adjacent to the metallic and liquid core. This enigmatic D" zone is both a thermal and chemical boundary layer characterized complex dynamic processes that are reflected in many intriguing seismic observations. Much progress was recently achieved in mineral physics, to characterize elastic and deformation properties of lowermost mantle minerals including the post-perovskite phase. Advances in geodynamic modeling now allow us to track the strain evolution during mantle convection. As a result, there are now precise ways to compute synthetic seismograms in a 3D anisotropic earth down to body wave frequencies. Our proposed study follows on preliminary work started 2 years ago, and is focused on the forward modeling of LPO anisotropy in D", with the goal of combining tools and observations developed by geodynamicists, seismologists and mineral physicists, in order to gain better understanding of the origin of seismic anisotropy in D", and determine which microscopic and macroscopic processes may be at play. In our work to-date, we have set up a multi-step procedure for this purpose, which combines five modeling ingredients in a logical chain: (1) For a particular hypothesis regarding mantle dynamics, geodynamical models provide information on the macroscopic strain deformation accommodated by individual packets of mantle material. (2) This strain deformation information is then used as boundary conditions for numerical models that calculate the resulting mineralogical texture (i.e. LPO) within a polycrystalline mineral aggregate. (3) Seismic elastic constants, determined from mineral properties and preferred orientations, are applied to numerous mineral aggregates throughout the region of interest, (4) followed by forward seismic modeling through the 3D elastic anisotropic model acquired from steps 1-3. (5) Resulting models and seismic waveforms are compared to available seismic observations. Our initial results illustrate that we can use macroscopic observations to constrain plausible constituents and deformation mechanisms. So far, our work has focused on 2D models of a subducting slab reaching the core-mantle boundary (CMB) and its subsequent spreading along the CMB. We here propose to extend our set of geodynamic tools to the 3D case, which will allow us to explore the predicted distribution of different kinds of anisotropy at the base of the mantle in a more realistic framework and confront the resulting seismic wavefields to available broadband seismic data. We will perform experiments and theoretical mineral physics computations. This project promotes interdisciplinary work and cross-education in the fields of geodynamics, mineral physics and seismology among the PI's, participating students and postdoctoral associates, stimulating learning to solve complex scientific problems by sharing different expertise. It will also provide suggestions for future seismic experiments targeted at better characterizing anisotropy in D".
地震各向异性(即地震波以不同的速度沿不同方向传播)在60年代中期被发现,并很快被定性地解释为对流中晶体取向(LPO)的结果。这一概念后来被普遍接受。最近,在与金属核和液态核相邻的最下部地幔中发现了强烈的各向异性和不均质性。这个神秘的D“带既是一个热边界层,又是一个化学边界层,其特征是复杂的动态过程,这在许多有趣的地震观测中都有所反映。最近在矿物物理学方面取得了很大进展,用来表征包括后钙钛矿相在内的最低地幔矿物的弹性和变形性质。地球动力学模拟的进步现在使我们能够跟踪地幔对流过程中的应变演变。因此,现在有了精确的方法来计算3D各向异性地球中的合成地震图,精确到体波频率。我们建议的研究是在两年前开始的前期工作的基础上进行的,重点是D“的LPO各向异性的正演模拟,目的是将地球动力学、地震学家和矿物物理学家开发的工具和观测结合起来,以便更好地了解D”的地震各向异性的起源,并确定哪些微观和宏观过程可能在起作用。在我们到目前为止的工作中,我们已经为此目的建立了一个多步骤的过程,它在一个逻辑链中结合了五个建模成分:(1)对于关于地幔动力学的特定假设,地球动力学模型提供了关于由单独的地幔物质包容纳的宏观应变变形的信息。(2)这种应变变形信息随后被用作数值模型的边界条件,用于计算多晶矿物集合体内的结果矿物结构(即LPO)。(3)根据矿物性质和优选取向确定的地震弹性常数被应用于整个感兴趣区域的众多矿物集合体,(4)随后通过步骤1-3获得的三维弹性各向异性模型进行正演地震模拟。(5)将所得模型和地震波形与已有的地震观测资料进行了对比。我们的初步结果表明,我们可以使用宏观观察来约束可能的成分和变形机制。到目前为止,我们的工作主要集中在俯冲板块到达核幔边界(CMB)及其随后沿CMB扩散的2D模型上。我们在这里建议将我们的地球动力学工具集扩展到3D情况,这将使我们能够在更现实的框架内探索地幔底部不同类型各向异性的预测分布,并将产生的地震波场与可用的宽带地震数据对峙。我们将进行实验和理论矿物物理计算。该项目促进国际地球动力学、矿物物理和地震学领域的跨学科合作和交叉教育,鼓励参与的学生和博士后助理通过分享不同的专业知识来学习解决复杂的科学问题。它还将为今后的地震实验提供建议,目的是更好地表征D的各向异性。
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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Barbara Romanowicz其他文献
The buoyancy of Earth's deep mantle
地球深部地幔的浮力
- DOI:
10.1038/551308a - 发表时间:
2017-11-16 - 期刊:
- 影响因子:48.500
- 作者:
Barbara Romanowicz - 通讯作者:
Barbara Romanowicz
Geodynamics / Géodynamique 3 D structure of the Earth ’ s lower mantle
地球动力学 / Géodynamique 地球下地幔的 3D 结构
- DOI:
- 发表时间:
2003 - 期刊:
- 影响因子:0
- 作者:
Barbara Romanowicz - 通讯作者:
Barbara Romanowicz
Efficient hybrid numerical modeling of the seismic wavefield in the presence of solid-fluid boundaries
存在固液边界时地震波场的高效混合数值模拟
- DOI:
10.1038/s41467-025-56530-5 - 发表时间:
2025-02-18 - 期刊:
- 影响因子:15.700
- 作者:
Chao Lyu;Barbara Romanowicz;Liang Zhao;Yder Masson - 通讯作者:
Yder Masson
On moment‐length scaling of large strike slip earthquakes and the strength of faults
关于大走滑地震的矩长尺度和断层强度
- DOI:
10.1029/2001gl014479 - 发表时间:
2002 - 期刊:
- 影响因子:5.2
- 作者:
Barbara Romanowicz;L. Ruff - 通讯作者:
L. Ruff
The Romanian earthquake of August 30, 1986: A study based on GEOSCOPE very long-period and broadband data
- DOI:
10.1007/bf00877169 - 发表时间:
1990-04-01 - 期刊:
- 影响因子:1.900
- 作者:
Tony Monfret;Anne Deschamps;Barbara Romanowicz - 通讯作者:
Barbara Romanowicz
Barbara Romanowicz的其他文献
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{{ truncateString('Barbara Romanowicz', 18)}}的其他基金
CSEDI Collaborative Proposal: a multi-disciplinary investigation of slab deformation and resulting seismic anisotropy from the transition zone to the base of the mantle
CSEDI 合作提案:对板片变形和由此产生的从地幔底部过渡带的地震各向异性进行多学科研究
- 批准号:
2054951 - 财政年份:2021
- 资助金额:
$ 38.32万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: Understanding the origins of MORB geochemical heterogeneity using constraints from seismic tomography and geodynamic modeling
CSEDI 合作研究:利用地震层析成像和地球动力学建模的约束了解 MORB 地球化学非均质性的起源
- 批准号:
1800324 - 财政年份:2018
- 资助金额:
$ 38.32万 - 项目类别:
Standard Grant
Resolving the influence of mantle heterogeneity on estimates of inner core anisotropy
解决地幔非均质性对内核各向异性估计的影响
- 批准号:
1829283 - 财政年份:2018
- 资助金额:
$ 38.32万 - 项目类别:
Standard Grant
Implementation of "Box Tomography" for high resolution imaging of Target Regions in the Earth's Deep Mantle
实施“盒式断层扫描”,对地球深部地幔目标区域进行高分辨率成像
- 批准号:
1758198 - 财政年份:2018
- 资助金额:
$ 38.32万 - 项目类别:
Continuing Grant
Anisotropic Layering in the North American Upper Mantle Using a Combination of Seismological Approaches
结合地震学方法研究北美上地幔的各向异性分层
- 批准号:
1460205 - 财政年份:2015
- 资助金额:
$ 38.32万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: A Multidisciplinary Approach to Investigate the Origin of Anisotropy at the Base of the Mantle
CSEDI 合作研究:研究地幔底部各向异性起源的多学科方法
- 批准号:
1464014 - 财政年份:2015
- 资助金额:
$ 38.32万 - 项目类别:
Continuing Grant
Collaborative Research: Characterizing sources of infragravity waves and the earth's hum using data from the Cascadia Amphibious Array
合作研究:利用卡斯卡迪亚两栖阵列的数据来表征次重力波和地球嗡嗡声的来源
- 批准号:
1538276 - 财政年份:2015
- 资助金额:
$ 38.32万 - 项目类别:
Standard Grant
Collaborative Research: Developing a Three-Dimensional Seismic Reference Earth Model (REM-3D) in Collaboration with the Community
合作研究:与社区合作开发三维地震参考地球模型 (REM-3D)
- 批准号:
1345103 - 财政年份:2014
- 资助金额:
$ 38.32万 - 项目类别:
Standard Grant
Investigation of the earth's mantle plumbing system at the global scale using an advanced seismic imaging approach.
使用先进的地震成像方法在全球范围内研究地幔管道系统。
- 批准号:
1417229 - 财政年份:2014
- 资助金额:
$ 38.32万 - 项目类别:
Continuing Grant
2013 Interior of the Earth GRC/GRS
2013 地球内部 GRC/GRS
- 批准号:
1321488 - 财政年份:2013
- 资助金额:
$ 38.32万 - 项目类别:
Standard Grant
相似国自然基金
E-Learning中的协作式学习与个性化预测模型研究
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- 批准年份:2003
- 资助金额:24.0 万元
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相似海外基金
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