Constraining depth dependent anisotropy in Australia through Ps Receiver function analysis, frequency-dependent shear wave splitting and forward modeling
通过 Ps 接收器函数分析、频率相关剪切波分裂和正演建模约束澳大利亚的深度相关各向异性
基本信息
- 批准号:1620386
- 负责人:
- 金额:$ 15.83万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2016
- 资助国家:美国
- 起止时间:2016-07-01 至 2021-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The continental lithosphere has witnessed much of the Earth's geologic and biologic evolution, giving us an unprecedented view into our planet's history. While our understanding of many aspects of the physical evolution of the Earth has flourished in recent years, fundamental gaps in our knowledge of some processes persist. One particular deficiency is in our understanding of the structure and geologic evolution of continents. While oceanic lithosphere has a life cycle that begins at mid-ocean ridges and ends at subduction zones, we still do not have a clear understanding of how the continental lithosphere first formed, or why the lithosphere has remained stable over billions of years, despite undergoing significant deformation in later tectonic events. In Australia, the oldest parts of the continental lithosphere are dated to about 3.2 billion years old, making it an excellent location for testing out hypotheses related to continental formation and evolution. Detailed geologic studies over decades have placed constraints on the timing of many of Australia's major tectonic events. However, observations of seismic anisotropy, which are used to infer information about tectonic deformation, tell a story about the Australian lithosphere that is significantly more complicated than what is inferred from the surface geology. The goal of this project is to use newly developed seismological methods to provide a more detailed and accurate picture of seismic anisotropy to help infer the tectonic evolution within the Australian continent, in order to better understand the processes of continental formation, assembly and evolution more generally. The character of the anisotropic structure in the mantle lithosphere and asthenosphere beneath Australia represents a long-standing puzzle, largely because inferences gleaned from different data analysis methods (SKS splitting vs. surface wave tomography) often conflict. This proposal will apply frequency-dependent SKS splitting analysis and anisotropic Ps receiver function analysis to place more precise constraints on the lateral and depth variability of anisotropy beneath the Australian continent. The proposed work has three specific goals: 1) Use data from 26 permanent broadband stations to measure frequency-dependent SKS splitting and apply Ps receiver function analysis, and for a subset of stations, carry out detailed forward modeling of the structure and compare results across methods for a subset of these stations. 2) Investigate the origin of depth-dependent anisotropy beneath Australia by analyzing models for anisotropic structure in terms of tectonic history and setting. 3) Understand the origin of the discrepancies between azimuthally anisotropic surface wave models and SKS splitting observations beneath Australia via comparisons with the independent depth-dependent models. Some specific science questions addressed by this work include: How does anisotropy vary with depth beneath the Australian continent? Do variations in anisotropic structure correspond to geologic and/or tectonic structures? Does the anisotropic structure of the mantle lithosphere shed light on past episodes of deformation? Why have previous studies identified discrepancies between surface wave tomography models and SKS splitting observations?
大陆岩石圈见证了地球的许多地质和生物进化,使我们对地球的历史有了前所未有的了解。虽然近年来我们对地球物理进化的许多方面的理解蓬勃发展,但我们对某些过程的认识仍然存在根本性的差距。一个特别的缺陷是我们对大陆的构造和地质演化的理解。虽然海洋岩石圈有一个从洋中脊开始到俯冲带结束的生命周期,但我们仍然不清楚大陆岩石圈最初是如何形成的,也不清楚为什么岩石圈在后来的构造事件中经历了重大的变形,却在数十亿年的时间里保持稳定。在澳大利亚,大陆岩石圈最古老的部分大约有32亿年的历史,这使它成为检验与大陆形成和演化有关的假设的绝佳地点。几十年来,详细的地质研究已经对澳大利亚许多主要构造事件的时间进行了限制。然而,对地震各向异性的观察,用来推断构造变形的信息,讲述了一个关于澳大利亚岩石圈的故事,这个故事比从地表地质推断的要复杂得多。该项目的目标是利用新开发的地震学方法提供更详细和准确的地震各向异性图像,以帮助推断澳大利亚大陆的构造演化,从而更好地了解大陆的形成、组合和演化过程。澳大利亚地幔岩石圈和软流圈各向异性结构的特征是一个长期存在的难题,主要是因为从不同的数据分析方法(SKS分裂与面波断层扫描)收集的推断经常相互冲突。该建议将应用频率相关的SKS分裂分析和各向异性Ps接收函数分析,对澳大利亚大陆下各向异性的横向和深度变异性进行更精确的约束。提出的工作有三个具体目标:1)使用来自26个永久宽带站的数据来测量频率相关的SKS分裂并应用Ps接收函数分析,并对一部分站进行详细的结构正演建模,并对其中一部分站的不同方法进行结果比较。2)从构造历史和环境角度分析各向异性构造模式,探讨澳大利亚地下深度相关各向异性的成因。3)通过与独立的深度依赖模型的比较,了解澳大利亚海底方位各向异性面波模型和SKS分裂观测之间差异的根源。这项工作解决了一些具体的科学问题,包括:各向异性是如何随着澳大利亚大陆下面的深度而变化的?各向异性结构的变化是否与地质和/或构造结构相对应?地幔岩石圈的各向异性结构是否揭示了过去的变形事件?为什么以前的研究发现了表面波层析模型和SKS分裂观测之间的差异?
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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Heather Ford其他文献
Wikidata as Semantic Infrastructure: Knowledge Representation, Data Labor, and Truth in a More-Than-Technical Project
维基数据作为语义基础设施:知识表示、数据劳动和超技术项目中的真相
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:5.2
- 作者:
Heather Ford;Andrew Iliadis - 通讯作者:
Andrew Iliadis
Examining perspective-taking skills in introductory geoscience students
检查地球科学入门学生的观点采择能力
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
G. Goldhagen;Heather Ford;K. Atit - 通讯作者:
K. Atit
Inverting {{Citation needed}}: critical design reflection of a citation learning game
反转{{需要引文}}:引文学习游戏的关键设计反思
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
Simon Knight;A. Shibani;Heather Ford;Simon Chambers - 通讯作者:
Simon Chambers
Navigating uncertainty: public diplomacy vs. AI
应对不确定性:公共外交与人工智能
- DOI:
10.1057/s41254-024-00330-z - 发表时间:
2024 - 期刊:
- 影响因子:1.5
- 作者:
Luigi Di Martino;Heather Ford - 通讯作者:
Heather Ford
Heather Ford的其他文献
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{{ truncateString('Heather Ford', 18)}}的其他基金
NERC - NSFGEO: Pliocene Lessons for the Indian Ocean Dipole (PLIOD)
NERC - NSFGEO:印度洋偶极子的上新世教训 (PLIOD)
- 批准号:
NE/Y001443/1 - 财政年份:2024
- 资助金额:
$ 15.83万 - 项目类别:
Research Grant
Reconstructing intermediate and deep ocean circulation during the Pliocene warm period
重建上新世温暖期的中层和深层海洋环流
- 批准号:
NE/N015045/2 - 财政年份:2018
- 资助金额:
$ 15.83万 - 项目类别:
Fellowship
Reconstructing intermediate and deep ocean circulation during the Pliocene warm period
重建上新世温暖期的中层和深层海洋环流
- 批准号:
NE/N015045/1 - 财政年份:2016
- 资助金额:
$ 15.83万 - 项目类别:
Fellowship
North Atlantic Bottom Water Temperature and Ice Volume Records from the Mid-Pleistocene Transition
中更新世过渡期北大西洋底层水温和冰量记录
- 批准号:
1436014 - 财政年份:2014
- 资助金额:
$ 15.83万 - 项目类别:
Standard Grant
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