Synthetic waveform modelling of SS precursors from anisotropic upper-mantle discontinuities

Synthetic waveform modelling of SS precursors from anisotropic upper-mantle discontinuities
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来自各向异性上地幔不连续面的SS前体的综合波形建模

DOI:
10.1093/gji/ggt474
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发表时间:
2014
影响因子:
2.8
通讯作者:
Rychert C
Rychert C
中科院分区:
地球科学2区
文献类型:
--
作者:
Rychert C

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SS前兆是研究上地幔不连续结构的有力工具。这些不连续性中的一些可以完全或部分地由各向异性随深度的变化来定义。因此,需要对各向异性不连续面的SS前兆波形预测进行仔细评估。在这里,我们进行合成波形建模,以评估潜在的usingSS前兆约束各向异性的不连续性。我们investigateSS前兆振幅模型与方位各向异性的不连续性与假设的六角形对称。我们证明了SS前兆极性变化是强大的,在很宽的范围内的震源极化我们的各向异性模型。虽然极性变化在所有具有各向异性不连续性的潜在两层模型中不是唯一的,但其他可观测量,例如前兆和构造环境的相对到达时间,可用于约束各向异性结构。我们讨论了以前的成像上地幔不连续性,可能是各向异性的,如莱曼不连续性,和不连续性的深度范围内的岩石圈-软流圈边界下太平洋的影响。
SSprecursors are a powerful tool for interrogating upper-mantle discontinuity structure. Some of these discontinuities may be defined fully or partially by a variation in anisotropy with depth. Therefore, a careful evaluation ofSSprecursor waveform predictions from anisotropic discontinuities is required. Here, we perform synthetic waveform modelling to evaluate the potential for usingSSprecursors to constrain anisotropic discontinuities. We investigateSSprecursor amplitudes from models with azimuthally anisotropic discontinuities with assumed hexagonal symmetry. We demonstrate thatSSprecursor polarity variations are robust across a wide range of earthquake source polarizations for our anisotropic models. While polarity variations are not unique among all potential two-layer models with anisotropic discontinuities, other observables, such as the relative arrival time of the precursor and tectonic settings, may be used to constrain anisotropic structure. We discuss implications for previous imaging of upper-mantle discontinuities that may be anisotropic, such as the Lehmann discontinuity, and discontinuities in depth range of the lithosphere–asthenosphere boundary beneath the Pacific.
SS前兆对东亚地区岩石圈和上地幔不连续面的研究
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