Finite-frequency tomography and waveform modeling of the South Atlantic mantle

这种体波层析成像的目的是在所有地幔深度成像整个大西洋南部和中部的热点区域。其目标是从观测到的宽带地震记录中最大限度地提取信息。利用所有可用的区域数据集，它将嵌入到全球有限频率的P波和PP波反演中。作为一个核心组成部分和技术创新，我们将利用全波形模拟的灵敏度核来发展岩心绕射P波层析成像。这种波型擦过地核，因此对地幔最深的部分进行了广泛的采样。因此，我们希望更好地了解地幔热柱的“立足点”和非洲巨大异常的内部结构。南大西洋和中大西洋是绕射P波层析成像的主要目标，因为它是唯一一个既有像样的样品，又有推测的地幔热柱积累的地区。层析模型将通过全3D波形建模进行验证，我们将使用我们可观的超级计算资源将其推向最高观测频率。它们的解释--根据热通量和地幔加热制度--将定量地与地幔环流数值模拟和矿物学模拟联系在一起。

This body-wave tomography aims to image the entire cluster of hotspots in the South and Central Atlantic, at all mantle depths. The goal is to extract a maximum of information from observed broadband seismograms. Exploiting all available regional data sets, it will be embedded in a global finite-frequency P- and PP-wave inversion. As a central component and technical novelty, we will develop the tomography of core-diffracted P-waves, by means of sensitivity kernels from full-waveform modeling. This wave type grazes the core and therefore samples the deepest part of the mantle extensively. Hence we hope for better information on the “footing” of mantle plumes and the internal structure of the vast African anomaly. The South and Central Atlantic is the prime target for diffracted P-wave tomography, since it is the only region with both decent sampling and an accumulation of presumed mantle plumes. The tomographic models will be verified with full 3D waveform modeling, which we will push to the highest observed frequencies using our considerable supercomputing resources. Their interpretation -- in terms of heat fluxes and mantle heating regime -- will be quantitatively tied to numerical mantle circulation simulations and mineralogical modeling.