Imaging the topography of the Lithosphere-Asthenosphere Boundary beneath South and East Africa using S receiver functions; a key to understand continental lithospheric evolution in and around active rifting systems

使用 S 接收器函数对南非和东非下方岩石圈-软流圈边界的地形进行成像；

• 批准号: 166045095
• 负责人: Professor Dr. Rainer Kind
• 金额: --
• 依托单位: Fachrichtung Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/166045095?language=en
• 关键词: Imaging; topography; Lithosphere; Asthenosphere; Boundary

The aim of this proposal is to study the structure of the mantle lithosphere beneath South and East Africa. No high resolution image of the Lithosphere-Asthenosphere Boundary (LAB) exists yet in this geodynamically active region, although for understanding the global tectonics, knowledge of the complete structure of lithospheric plates is required rather than only the easier accessible crustal structure. This goal will be achieved using the novel technique of S receiver function. This technique employing S-to-P conversions appears promising for detecting the LAB beneath seismic stations in Africa and has already proven its power for mapping the LAB in the tectonically different regions (see enclosures). The recently tested plain summation technique will also be used to determine the complete P and S receiver site Green s function. This technique will serve to constrain P and S multiples from the LAB resulting in absolute LAB depth estimation. Due to the available data from more than 200 permanent and temporary broadband stations in East and South Africa, it is now possible to obtain maps of the LAB topography with so far unprecedented resolution. The results may obtain detailed images of geodynamic processes and significantly improve the knowledge of continental lithospheric evolution as well as deeper mantle processes related to the continental rifting.

这项建议的目的是研究南非和东非地幔岩石圈的结构。在这个地球动力学活跃的地区，还没有高分辨率的岩石圈-软流圈边界（LAB）图像，尽管为了了解全球构造，需要了解岩石圈板块的完整结构，而不仅仅是更容易获得的地壳结构。这一目标将使用S接收器函数的新技术来实现。这种采用S到P转换的技术似乎很有希望探测非洲地震台站下方的LAB，并已证明其在绘制不同构造区域LAB图方面的能力（见附文）。最近测试的普通求和技术也将用于确定完整的P和S接收器站点绿色函数。该技术将用于约束来自LAB的P和S多次波，从而导致绝对LAB深度估计。由于东非和南非200多个永久和临时宽带站提供的数据，现在可以获得具有前所未有分辨率的LAB地形图。研究结果可获得地球动力学过程的详细图像，并可显著提高对大陆岩石圈演化以及与大陆裂谷作用有关的深部地幔过程的认识。

项目成果

Seismic evidence for stratification in composition and anisotropic fabric within the thick lithosphere of Kalahari Craton

• DOI: 10.1002/2013gc004955
• 发表时间: 2013-12
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: F. Sodoudi;X. Yuan;R. Kind;S. Lebedev;J. Adam;E. Kästle;F. Tilmann

Structure of the upper mantle in the north-western and central United States from USArray S-receiver functions

• DOI: 10.5194/se-6-957-2015
• 发表时间: 2015-07
• 期刊: Solid Earth
• 影响因子: 3.4
• 作者: R. Kind;X. Yuan;J. Mechie;F. Sodoudi

Thickness of the lithosphere beneath Turkey and surroundings from S-receiver functions

• DOI: 10.5194/se-6-971-2015
• 发表时间: 2015-07
• 期刊: Solid Earth
• 影响因子: 3.4
• 作者: R. Kind;T. Eken;F. Tilmann;F. Sodoudi;T. Taymaz;F. Bulut;X. Yuan;B. Can;Felix Schneider

Seismic receiver functions and the lithosphere–asthenosphere boundary

地震接收函数和岩石圈-软流圈边界

• DOI: 10.1016/j.tecto.2012.03.005
• 发表时间: 2012
• 期刊: Tectonophysics
• 影响因子: 2.9

Scandinavia: A former Tibet?

斯堪的纳维亚半岛：前西藏？

• DOI: 10.1002/ggge.20251
• 发表时间: 2013
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: Sodoudi;Shomali;Roberts;Bianchi;Tilmann;Balling;Jacobsen;P. And Geissler
• 通讯作者: P. And Geissler