The global pattern of crustal seismic anisotropy inferred from teleseismic converted phases

大量的地震学数据，现在已经成为长期运行（永久）全球分布的台站，开辟了独特的机会，应用新的方法来测试目前的假设，地震各向异性的相对意义在地壳和地幔下的大陆。这种独特的时间和空间数据覆盖范围使我们能够以前所未有的分辨率研究地壳地震各向异性，并将观测结果与地表地质特征和/或先前推导的地幔各向异性模式相关联。 地壳各向异性的相对量对全球范围内的地震观测有多大意义？（二） 地壳各向异性在地质/构造边界上是连续的，还是与这些区域不同并相互关联？第三章 在不同构造环境中，岩石圈壳幔部分的变形之间有什么样的关系？(Is以前提出的岩石圈垂直相干变形真的有效吗？）四、 地壳地震各向异性对剪切波分裂测量的影响有多大？第五章） 在不同的构造环境中，校正后的地幔各向异性是如何变化的？拟议的调查所需的数据将通过国际数据储存库，如IRIS DMC、GEOSCOPE、GEOFON和ORFEUS，从全球三分量宽带常设台站收集。欧洲和中东的地方和区域地震台网提供的其他数据将补充这一数据集，最近已经有了利用壳幔边界（莫霍面不连续面）的P波到S波转换（Ps）相位的新方法，这些方法将用于推断地壳各向异性的强度和方向以及全球范围的地壳厚度和平均Vp/Vs比。地壳各向异性参数随后将用于校正现有SKS数据库中的地幔分裂参数，并将开发一种自动程序，以便对如此大量的数据进行分析。这项研究还将包括开发和建立一个基于互联网的地壳和（经校正的）地幔各向异性参考数据库。

The enormous amount of seismological data, which has now become available from long-running (permanent) globally-distributed stations, opens up unique opportunities for applying new methods to test current hypotheses about the relative significance of seismic anisotropy in the crust and mantle beneath the continents. This unique temporal and spatial data coverage enables us to study crustal seismic anisotropy at unprecedented resolution and to correlate the observations with surface geological features and/or previously derived patterns of mantle anisotropy.This study is motivated by a number of unanswered questions, including:1) How significant is the relative amount of crustal anisotropy for seismological observations on a global scale?2) Is the crustal anisotropy continuous across the geological/tectonic boundaries or is it distinct and correlated with such provinces?3) What is the relationship between the deformation in the crust and mantle portions of lithosphere in various tectonic environments? (Is the previously proposed Vertical Coherent Deformation of the lithosphere really valid?)4) How much are shear wave (SKS) splitting measurements affected by crustal seismic anisotropy?5) How does the corrected mantle anisotropy vary across diverse tectonic environments?The data required for the proposed investigation will be assembled from global 3-component broad-band permanent stations through the international data repositories such as the IRIS DMC, GEOSCOPE, GEOFON and ORFEUS. The dataset will be supplemented by additional data from local and regional seismic networks from Europe and the Middle-East.New methods to exploit P-to-S waves converted (Ps) phases from the crust-mantle boundary (Moho discontinuity) have recently become available and will be used to infer the strength and direction of crustal anisotropy as well as the crustal thickness and average Vp/Vs ratios on a global scale. The parameters of crustal anisotropy will be subsequently used to correct the mantle splitting parameters available through the present SKS data bases.An automatic procedure will be developed to make the analysis of such a great amount of data feasible. The study will also include the development and setup of an internet-based reference database for crustal and (corrected) mantle anisotropy.