CSEDI: Collaborative Res.: Toward Mapping 3D Variations in Temperature and Chemical Composition in the Upper Mantle through a Mineral Physics-based Inversion of Seismic Waveforms
CSEDI:协作研究:通过基于矿物物理的地震波形反演绘制上地幔温度和化学成分的 3D 变化
基本信息
- 批准号:0111824
- 负责人:
- 金额:$ 6.49万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2001
- 资助国家:美国
- 起止时间:2001-08-15 至 2003-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Romanowicz Karato This is a collaborative study between seismologists at UC Berkeley and mineral physicists at Yale University, to explore the feasibility of inverting seismic long period waveform data directly for 3D variations in effective temperature and major element chemistry in the upper mantle. Effective temperature will include the effects of temperature and water content, which cannot be easily separated from seismic data alone. Water content is likely to have large effects on rheology and therefore has significant influence on the dynamics of the Earth's mantle. They will use the mineral physics framework to delineate contributions from these various factors and provide estimates of relevant partial derivatives. Effects of major element chemistry can be distinguished from that of water, because water has a large influence on anelasticity whereas major element chemistry does not. On the other hand anelasticity is more strongly dependent on temperature than seismic velocity. At the heart of this study is the conjecture, supported by theoretical considerations, that the one step inversion of seismic waveforms for physical parameters such as composition C and (effective) temperature T*, should yield more stable results than the standard approach of first inverting for velocity and Q structure and then interpreting the obtained maps in terms of physical parameters. The latter is currently inhibited by the poor resolution in 3D upper mantle Q, due to contamination of amplitudes by largely unmodelled, but significant, effects of focusing and scattering. In the one step inversion the effects of C and T* are coupled in the inversion matrix elements, whereas in the standard approach, only the amplitudes depend on anelastic terms, while both phase and amplitudes depend on the elastic ones, leading to strong biases in the distribution of Q inferred. The coupled character of the equations in the one step approach, combined with the strong sensitivity of amplitudes to T* (through anelastic terms) should offset the approximate character of the available mineral physics partial derivatives and the errors due to inadequate theoretical treatment of focusing.
Romanowicz Karato 这是加州大学伯克利分校地震学家和耶鲁大学矿物物理学家之间的一项合作研究,旨在探索直接反演地震长周期波形数据以获得上地幔有效温度和主要元素化学的 3D 变化的可行性。有效温度包括温度和含水量的影响,不能轻易地将其与地震数据分开。水含量可能对流变学有很大影响,因此对地幔的动力学有重大影响。他们将使用矿物物理框架来描述这些不同因素的贡献,并提供相关偏导数的估计。主元素化学的影响可以与水的影响区分开来,因为水对迟弹性有很大影响,而主元素化学则没有。另一方面,与地震速度相比,迟弹性对温度的依赖性更强。这项研究的核心是在理论考虑的支持下的猜想,即成分 C 和(有效)温度 T* 等物理参数的地震波形的一步反演应该比首先反演速度和 Q 结构然后根据物理参数解释所获得的图的标准方法产生更稳定的结果。后者目前受到 3D 上地幔 Q 分辨率差的抑制,这是由于很大程度上未建模但显着的聚焦和散射效应对振幅的污染。在一步反演中,C 和 T* 的影响耦合在反演矩阵元素中,而在标准方法中,只有振幅取决于非弹性项,而相位和振幅都取决于弹性项,导致推断的 Q 分布存在强烈偏差。一步法中方程的耦合特性,加上振幅对 T* 的强烈敏感性(通过滞弹性项),应抵消可用矿物物理偏导数的近似特性以及由于聚焦理论处理不充分而产生的误差。
项目成果
期刊论文数量(0)
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Shun-ichiro Karato其他文献
Properties and dynamics of mantle and core
地幔和地核的性质和动力学
- DOI:
- 发表时间:
2008 - 期刊:
- 影响因子:0
- 作者:
Bernhard Steinberger;Eiji Ohta ni;Geld Steinle-Neumann;Jame s Connolly;Shun-ichiro Karato - 通讯作者:
Shun-ichiro Karato
High-resolution mapping of North America suggests numerous low-velocity zones above and below the mantle transition zone
对北美洲的高分辨率测绘显示,在地幔过渡带上下存在众多低速带。
- DOI:
10.1016/j.tecto.2025.230775 - 发表时间:
2025-06-27 - 期刊:
- 影响因子:2.600
- 作者:
Steve A.B. Carr;Tolulope Olugboji;Jeffrey Park;Shun-ichiro Karato - 通讯作者:
Shun-ichiro Karato
Correction to: strength of single-crystal orthopyroxene under lithospheric conditions
- DOI:
10.1007/s00410-018-1458-1 - 发表时间:
2018-04-01 - 期刊:
- 影响因子:3.700
- 作者:
Tomohiro Ohuchi;Shun-ichiro Karato;Kiyoshi Fujino - 通讯作者:
Kiyoshi Fujino
Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics
- DOI:
https://doi.org/10.1016/j.epsl.2020.116642 - 发表时间:
2021 - 期刊:
- 影响因子:
- 作者:
Han Guangjie;Li Juan;Guo Guangrui;Walter D. Mooney;Shun-ichiro Karato;David A. Yuen - 通讯作者:
David A. Yuen
Deep mantle melting, global water circulation and its implications for the stability of the ocean mass
- DOI:
10.1186/s40645-020-00379-3 - 发表时间:
2020-12-10 - 期刊:
- 影响因子:2.800
- 作者:
Shun-ichiro Karato;Bijaya Karki;Jeffrey Park - 通讯作者:
Jeffrey Park
Shun-ichiro Karato的其他文献
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{{ truncateString('Shun-ichiro Karato', 18)}}的其他基金
Collaborative Research: CSEDI: Understanding the Role of Hydrogen and Melting in the Water Transport Across the Transition Zone-Lower Mantle Boundary
合作研究:CSEDI:了解氢和熔化在跨过渡带-下地幔边界的水传输中的作用
- 批准号:
2001339 - 财政年份:2020
- 资助金额:
$ 6.49万 - 项目类别:
Standard Grant
Collaborative Research: Understanding the Origin of the mid-lithospheric discontinuity within a stable continent from a combined geophysics-mineral physics approach
合作研究:通过地球物理学-矿物物理学相结合的方法了解稳定大陆内岩石圈中部不连续性的起源
- 批准号:
1818792 - 财政年份:2018
- 资助金额:
$ 6.49万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: Understanding the nature of water transport between the transition zone and the lower mantle through the interdisciplinary studies
CSEDI合作研究:通过跨学科研究了解过渡带与下地幔之间的水运移本质
- 批准号:
1764271 - 财政年份:2018
- 资助金额:
$ 6.49万 - 项目类别:
Continuing Grant
An experimental study on grain-size evolution during phase transformations in the mantle transition zone and its influence on rheological properties
地幔过渡带相变过程中晶粒尺寸演化及其对流变特性影响的实验研究
- 批准号:
1445356 - 财政年份:2015
- 资助金额:
$ 6.49万 - 项目类别:
Continuing Grant
Experimental studies on plastic deformation of the lower mantle materials
下地幔材料塑性变形的实验研究
- 批准号:
1520006 - 财政年份:2015
- 资助金额:
$ 6.49万 - 项目类别:
Continuing Grant
CSEDI Collaborative Research: Understanding the nature of water and melt transport between the transition zone and the lower mantle combining mineral physics and seismology
CSEDI合作研究:结合矿物物理和地震学了解过渡带和下地幔之间水和熔体传输的性质
- 批准号:
1464003 - 财政年份:2015
- 资助金额:
$ 6.49万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: Grand Challenge for Experimental Study of Plastic Deformation Under Deep Earth Conditions
CSEDI合作研究:深地条件下塑性变形实验研究的巨大挑战
- 批准号:
1361327 - 财政年份:2014
- 资助金额:
$ 6.49万 - 项目类别:
Continuing Grant
CSEDI: Understanding the structure of the continental upper mantle through the use of magnetotelluric and seismic observations
CSEDI:通过使用大地电磁和地震观测了解大陆上地幔的结构
- 批准号:
1160932 - 财政年份:2012
- 资助金额:
$ 6.49万 - 项目类别:
Standard Grant
An Experimental Study on the Strength of the Lithosphere: Large-strain shear deformation experiments of olivine + orthopyroxene aggregates
岩石圈强度的实验研究:橄榄石斜方辉石聚集体大应变剪切变形实验
- 批准号:
1214861 - 财政年份:2012
- 资助金额:
$ 6.49万 - 项目类别:
Standard Grant
Experimental studies on rheological properties of transition zone minerals
过渡带矿物流变特性的实验研究
- 批准号:
1015336 - 财政年份:2011
- 资助金额:
$ 6.49万 - 项目类别:
Continuing Grant
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