内核地震各向异性是立方体铁塑性流动的标志吗？
Is inner core seismic anisotropy a marker of plastic flow of cubic iron?
摘要：
本文研究地震各向异性的观测结果是否与内核铁合金的立方结构相一致。我们假设各向异性是由在内核赤道处的优先生长引起的大尺度流动中的塑性形变的结果。根据文献中的弹性模量，bcc-或fcc-Fe产生的地震各向异性远低于地震观测值（$\textless{}0.4\%$）。蒙特卡罗方法使我们能够将这一结果推广到立方系统中任何形式的弹性各向异性。在我们的模型中，内核全局各向异性与铁合金的立方结构是不相容的。因此，如果内核材料确实是立方的，则必须存在与由大尺度流动引起的塑性形变不相容的大尺度相干各向异性结构。
英文摘要：
This paper investigates whether observations of seismic anisotropy are compatible with a cubic structure of the inner core Fe alloy. We assume that anisotropy is the result of plastic deformation within a large scale flow induced by preferred growth at the inner core equator. Based on elastic moduli from the literature, bcc- or fcc-Fe produce seismic anisotropy well below seismic observations ($\textless{}0.4\%$). A Monte-Carlo approach allows us to generalize this result to any form of elastic anisotropy in a cubic system. Within our model, inner core global anisotropy is not compatible with a cubic structure of Fe alloy. Hence, if the inner core material is indeed cubic, large scale coherent anisotropic structures, incompatible with plastic deformation induced by large scale flow, must be present.
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