| 项目编号: | 1565511
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| 项目名称: | What are the seismic expressions of deep thermal and thermochemical plumes? |
| 作者: | Jeroen Ritsema
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| 承担单位: | University of Michigan Ann Arbor
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| 批准年: | 2016
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| 开始日期: | 2016-04-01
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| 结束日期: | 2018-03-31
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| 资助金额: | 194195
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | plume
; thermochemical plume ascent
; plume signature
; thermochemical plume
; plume morphology
; plume formation
; mantle plume
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| 英文摘要: | Hawaii and Iceland are classic examples of volcanic islands associated with dynamical upwellings (i.e., plumes) from the deep mantle. Plumes form naturally and abundantly in laboratory simulations of Earth convection. Yet, there is no consensus among Earth scientists whether rising plumes exist in the Earth. The burden is on seismologists to find expressions of plumes in seismic data. This proposal is aimed at identifying how physically plausible thermal and thermochemical plumes may perturb seismic waves and how these perturbations can be found in seismic data. The project will support one PhD student. The research expands an ongoing international collaboration that provides important international experience to the PhD student at Michigan and the two students in Europe who are directly involved in the project.
This proposal leverages significant investments made by the NSF in observational geophysics (including EarthScope and dedicated seismic arrays) by using the available data and providing a new, interdisciplinary investigation into the resolvability of mantle plumes by observational geophysics.
By combining multidisciplinary expertise, the work in this proposal will develop high-resolution simulations of plume formation and plume morphology and it will quantify the expected plume signatures in seismic data. The research involves computer simulations of thermal and thermochemical plume ascent, mineral physics calculations of the seismic wave speed variations within plumes, and 3D simulation of the distortion of the seismic wave field by plumes. Waveform and traveltime tomography and receiver function analysis of simulated waveforms will demonstrate how plumes are imaged tomographically and whether they produce observable deflections of phase boundaries in the transition zone. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/92660
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Jeroen Ritsema. What are the seismic expressions of deep thermal and thermochemical plumes?. 2016-01-01.
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