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| DOI | 10.1002/2013GL058669 |
| The effect of large-scale shear-velocity heterogeneity on SS precursor amplitudes | |
| Bai, L.; Ritsema, J. | |
| 通讯作者 | Bai, L (通讯作者) |
| 发表日期 | 2013 |
| ISSN | 0094-8276 |
| EISSN | 1944-8007 |
| 起始页码 | 6054 |
| 结束页码 | 6058 |
| 卷号 | 40期号:23 |
| 英文摘要 | Precursors to the SS wave have been analyzed extensively to characterize seismic discontinuities in the upper mantle. We examine the influence of shear-velocity heterogeneity on the amplitude of underside shear wave reflections off the 410 (i.e., S410S) and 660 (i.e., S660S) discontinuities using waveform data from global seismic networks and spectral element method synthetics for four tomographic models of the crust and mantle. On average, the S660S/SS amplitude ratio is smaller than values predicted for the Preliminary Reference Earth Model (PREM) and tomographic models of shear velocity perturbations from PREM. The variation of S410S/SS and S660S/SS ratios determined for the 3-D models is significant. Its amplitude depends on the amplitude of shear-velocty heterogeneity in the mantle and on the incorporated model for the crust. The S410S/SS and S660S/SS amplitude variations are stronger in the dataand do not correlate spatially with the simulated ratios. It is therefore not certain that the spatial variation of S410S/SS and S660S/SS, as expressed by cap averaging, can be related to compositional heterogeneity in the mantle, given the profound influence of the heterogeneous crust and mantle. |
| 关键词 | TRANSITION ZONE DISCONTINUITIESSEISMIC DISCONTINUITYSTRUCTURE BENEATHEARTHS MANTLEP-WAVETOPOGRAPHYPHASEREFLECTIVITYCONSTRAINTSPACIFIC |
| 英文关键词 | mantle transition zone; SS precursors; velocity heterogeneity; amplitude |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000329141900008 |
| 来源期刊 | GEOPHYSICAL RESEARCH LETTERS
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/258136 |
| 推荐引用方式 GB/T 7714 | Bai, L.,Ritsema, J.. The effect of large-scale shear-velocity heterogeneity on SS precursor amplitudes[J]. 中国科学院青藏高原研究所,2013,40(23). |
| APA | Bai, L.,&Ritsema, J..(2013).The effect of large-scale shear-velocity heterogeneity on SS precursor amplitudes.GEOPHYSICAL RESEARCH LETTERS,40(23). |
| MLA | Bai, L.,et al."The effect of large-scale shear-velocity heterogeneity on SS precursor amplitudes".GEOPHYSICAL RESEARCH LETTERS 40.23(2013). |
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