Array study of the Reunion hotspot region from the mantle transition zone to the core-mantle boundary

留尼旺热点区地幔过渡带至核幔边界的阵列研究

• 批准号: 247997550
• 负责人: Professorin Dr. Christine Thomas
• 金额: --
• 依托单位: Institut für Geophysik
• 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
• 来源: https://gepris.dfg.de/gepris/projekt/247997550?language=en
• 关键词: Array; study; Reunion; hotspot; region

The aim of this project is to search for evidence of the Réunion hotspot and hotspot track situated in the Indian Ocean and its extent into the deep mantle. We will use data from the recently deployed RHUM-RUM experiment (land and ocean bottom seismometers) and additionally available data to study the upper mantle discontinuities as well as seismic structures near the core-mantle boundary beneath La Réunion. Studying a seldom utilised seismic probe (SP) and its precursors which originate from reflections off mantle seismic discontinuities, we will determine the depths of these discontinuities. This in turn will provide information on mantle temperatures and possible upwellings in the region. Combining these novel data with other seismic waves we will have an unprecedented coverage of the mantle beneath the Indian Ocean allowing us to derive a detailed, high-resolution picture of the seismic structures. In addition seismic structures in the lowermost Earth's mantle will provide information on mantle flow at the base of the mantle and will give information on the extent of the Réunion plume into the deep mantle.

该项目的目的是寻找位于印度洋的留尼旺热点和热点轨迹的证据及其深入地幔的范围。我们将使用最近部署的RHUM-RUM实验（陆地和海底地震仪）的数据以及其他可用数据来研究上地幔不连续性以及La Réunion下方核幔边界附近的地震结构。研究一种很少使用的地震探头（SP）及其由地幔地震不连续面反射产生的前兆，我们将确定这些不连续面的深度。这反过来将提供有关地幔温度和该地区可能发生的地壳上升的信息。将这些新数据与其他地震波相结合，我们将对印度洋下的地幔进行前所未有的覆盖，使我们能够获得详细的高分辨率地震结构图。此外，最低地幔的地震结构将提供关于地幔底部地幔流动的信息，并将提供关于留尼旺地幔柱进入深地幔的范围的信息。

项目成果

Improvement of coda phase detectability and reconstruction of global seismic data using frequency-wavenumber methods

• DOI: 10.1093/gji/ggx477
• 发表时间: 2018-02
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: S. Schneider;C. Thomas;R. Dokht;Y. Gu;Yunfeng Chen

A hot midmantle anomaly in the area of the Indian Ocean Geoid Low

印度洋大地水准面低压区的中地幔热异常

• DOI: 10.1002/2017gl073440
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: C. Thomas;J. van Driel;B. Heyn
• 通讯作者: B. Heyn

Using SP precursor waves to detect upper-mantle discontinuities

• DOI: 10.1093/gji/ggy369
• 发表时间: 2018-09
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: A. Reiss;C. Thomas;T. Lecocq