Whole-mantle body-wave tomography under the hotspot of La Réunion

留尼汪岛热点下的全地幔体波断层扫描

基本信息

  • 批准号:
    247995824
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    德国
  • 项目类别:
    Research Grants
  • 财政年份:
    2014
  • 资助国家:
    德国
  • 起止时间:
    2013-12-31 至 2018-12-31
  • 项目状态:
    已结题

项目摘要

The island of La Reunion is one of the most active and long-Iived volcanoes in the world. Its time- progressive, 5500-km long hotspot track emerges from the Deccan Traps of India, one of the largest flood basalt provinces on earth, which had a massive impact on global climate and life when they erupted. We want to establish the heat source and "plumbing system" that has been fueling this powerful hotspot for 65 million years. Through the RHUM-RUM project, a German- French effort funded mainly by the DFG and the ANR, we have deployed more than 90 broadband, ocean-bottom and Sand seismometers across the western Indian Ocean since 2011.The goal of RHUM-RUM is to seismically image a mantle plume - or lack of plume - from the surface down to the core-mantle boundary, and to understand the results in terms of material and heat flow. This comprises vertically ascending flow in the plume conduit, as well as any lateral flow spreading into the upper mantle of the western Indian Ocean. Here we are asking for funding for a Ph.D. Student to work the acquired waveform data into three-dimensional, whole-mantle P- and S-wave models of the mantle. We will be using multi-frequency tomography, a state-of-the art waveform Inversion method. Technical novelties or near-novelties include(i) the fully finite-frequency processing and Inversion of ocean-bottom and island seismograms across the entire usable frequency range of body waves.(ii) embedding of the RHUM-RUM data into a hemisphere-scale, whole-mantle model by joint Inversion with all other broadband data available for the hemisphere.(iii) the inclusion of core-diffracted waves, thanks to fully numerical waveform modeling. The goal is a significant improvement in structure of the lowermost mantle, the presumed footing region of deep mantle plumes.
留尼旺岛是世界上最活跃、寿命最长的火山之一。它的时间渐进,5500公里长的热点轨道出现在印度的德干陷阱,地球上最大的洪水玄武岩省之一,当它们爆发时,对全球气候和生命产生了巨大的影响。我们想建立热源和“管道系统”,它为这个强大的热点提供了6500万年的燃料。通过主要由DFG和ANR资助的德国-法国合作项目RHUM-RUM,自2011年以来,我们在西印度洋部署了90多个宽带海底和沙地地震仪。RHUM-RUM的目标是对从地表到核-幔边界的地幔柱(或缺乏地幔柱)进行地震成像,并从物质和热流的角度来理解结果。这包括羽流管道中的垂直上升流,以及扩散到西印度洋上地幔的任何横向流。我们在这里申请一个博士学位。学生将获得的波形数据转换为地幔的三维全地幔P波和S波模型。我们将使用多频层析成像,一种最先进的波形反演方法。技术上的新颖性或接近新颖性包括(i)在体波的整个可用频率范围内对海底和岛屿地震图进行完全有限频率处理和反演。(ii)将RHUM-RUM数据嵌入到半球尺度的全地幔模型中,通过与半球的所有其他宽带数据进行联合反演。(iii)包括核心衍射波,由于完全数值波形建模。其目标是显著改善最低地幔的结构,这是深地幔柱的假定基础区域。

项目成果

期刊论文数量(1)
专著数量(0)
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Professor Dr. Heiner Igel其他文献

Professor Dr. Heiner Igel的其他文献

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{{ truncateString('Professor Dr. Heiner Igel', 18)}}的其他基金

Geodynamic modelling and tomographic visibility of a mantle plume under La Réunion
留尼汪岛地幔柱的地球动力学建模和层析可见性
  • 批准号:
    247034637
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Translation, Strain and Rotation: New Approaches to SeismicProcessing and Inversion
平移、应变和旋转:地震处理和反演的新方法
  • 批准号:
    227695946
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Research Grants
RHUM-RUM (Réunion Hotspot and Upper Mantle & Réunions Unterer Mantel): Seismological imaging of a mantle plume under La Réunion, western Indian Ocean
RHUM-RUM(留尼汪热点和上地幔
  • 批准号:
    207475088
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Web-based technology for storage, processing, and simulation of multi-component data in seismology - First steps towards a new design
基于网络的地震学多分量数据存储、处理和模拟技术 - 迈向新设计的第一步
  • 批准号:
    29077640
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Earthquake induced rotational ground motions
地震引起的旋转地面运动
  • 批准号:
    28526099
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Investigation of fluid-controlled seismicity in a swarmquake area
群震区流体控制地震活动研究
  • 批准号:
    5409162
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Research Grants
The 3-D seismic signature of plumes: wavefield effects and experiment optimization
羽流的 3D 地震特征:波场效应和实验优化
  • 批准号:
    5323096
  • 财政年份:
    2001
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Three-dimensinal waveform effects in global seismology: algorithms - parallelism - data analysis
全球地震学中的三维波形效应:算法-并行性-数据分析
  • 批准号:
    5233786
  • 财政年份:
    2000
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Near-Surface Seismic Exploration of Planetary Bodys with Adaptive Networks
利用自适应网络对行星体进行近地表地震勘探
  • 批准号:
    517291159
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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