Investigation of the influence of mantle structures on Earth's core observations

地核的地震研究通常是利用体波进行的，而波PKP和SKS在这里非常重要。通常假设波在地幔中的路径是相似的，在分析核相时可以忽略地幔结构。然而，他的假设并不一定是正确的，这一提议的目的是量化地幔结构如何影响地震核相。为此，我们计划对五个路径使用阵列地震学方法，并测量地震波的路径偏差(慢度和后方位角)，这最终会导致旅行时间偏差。如果忽略路径偏差，产生的旅行时差将投射到核心，这可能导致误导模型，如果核心。转换波(SKP和PKS)在部分地幔路径上具有不同的路径，与PKP波结合使用，可以区分地幔结构和核结构。除了阵列观测外，地震三维模拟还将显示高分辨率地震速度模型(层析成像)对地震波的路径和走时的影响程度，以及地幔和核部的结构产生了我们研究中使用的波的路径和走时偏差。此外，使用3D建模，我们的目标是对不同的路径进行预测，这些路径可以用于未来的核心研究。这项研究的结果不仅对地震学模型有影响，而且对地球动力学和矿物学研究也有影响，因为走时变化被用来约束岩心的各向异性。由于构造对S波和P波的不同影响可以提供有关地球深部矿物学的信息，利用穿过地幔同一区域的PKP波和SKS波也可以更好地量化最下地幔的结构。

Seismic investigations of the Earth's core are often carried out using body waves and the waves PKP and SKS are of great importance here. Usually the assumption is made that the paths of the waves are similar in the mantle and that mantle structures can be neglected when analysing core phases. However, his assumption does not have to be correct and the aim of this proposal is to quantify how mantle structures can influence seismic core phases. For this we are planning to use array seismological methods for five paths and measure path deviations (slowness and backazimuth) of the seismic waves, which ultimately lead to travel time deviations. If the path deviations are neglected, the resulting travel time differences will be projected into the core and this can lead to mis-leading models if the inner core. The use of converted waves (SKP and PKS), which have a different path on part of the mantle path, in combination with PKP waves allow the differential investigation of mantle and core structures. In addition to the array observations, seismic 3D modeling will show the extent to which the paths and travel times of the seismic waves are influenced by high-resolution seismic velocity models (tomography) and which structures in the mantle and core generate path and travel time deviations those waves used in our study. Furthermore, using 3D modeling we aim to make predictions for different paths that can be used for future core investigations. The results of this study have an influence not only on seismological models but also on geodynamic and mineralogical investigations, since travel time variations have been used to constrain core anisotropy. By using PKP and SKS waves, which pass through the same regions in the mantle, structures of the lowermost mantle can also be better quantified, since the different effect of structures on S-waves and P-waves can provide information about deep Earth mineralogy.