Synthetic waveform modelling of SS precursors from anisotropic upper-mantle discontinuities
Synthetic waveform modelling of SS precursors from anisotropic upper-mantle discontinuities
复制标题
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
中科院分区:
文献类型:
--
作者:
Rychert C
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.
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影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2005
期刊:
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DOI:
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期刊:
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通讯作者:
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DOI:
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期刊:
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