| DOI: | 10.1002/2013GL058918
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| 论文题名: | A ubiquitous low-velocity layer at the base of the mantle transition zone |
| 作者: | Shen X.; Yuan X.; Li X.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10410
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| EISSN: | 1944-10141
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| 出版年: | 2014
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| 卷: | 41, 期:3 | | 起始页码: | 836
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| 结束页码: | 842
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| 语种: | 英语
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| 英文关键词: | mantle discontinuity
; mineral phase transformation
; receiver function
; slant stack
; the 600 discontinuity
; the X-discontinuity
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| Scopus关键词: | Phase transitions
; Reverberation
; Thermal stratification
; Mantle discontinuities
; Mineral phase
; Receiver functions
; slant stack
; the 600 discontinuity
; X-discontinuity
; Structural geology
; crustal structure
; mantle
; oceanic crust
; seismic anisotropy
; transition zone
; velocity
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| 英文摘要: | Global stacks of receiver functions clearly exhibit the upper mantle stratification. Besides the most prominent seismic discontinuities, such as the Moho and the 410 and 660 km discontinuities, a negative discontinuity is detected at a depth of ∼600 km, indicating a low-velocity layer at the base of the mantle transition zone. The slant-slack technique helps to identify the primary conversions from the multiple reverberations. Presence of the negative 600 km discontinuity underneath both continent and ocean island stations, where the crustal thickness significantly differs, also precludes the possible cause of crustal reverberations. We conclude that the negative 600 km discontinuity could be a global feature, possibly resulted from accumulation of ancient subducted oceanic crust. The X-discontinuity at ∼300 km depth is also observed in our global stacks, which can be explained by the coesite-stishovite phase transformation. Key Points Global receiver function stacks revealed mantle stratification A positive 300 km and a negative 600 km discontinuity are observed Slant-stack technique identifies the primary conversions from the multiples ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893656238&doi=10.1002%2f2013GL058918&partnerID=40&md5=33e0e119220d2c6dc3dbaf307f5d5c61
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7674
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, China
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| Recommended Citation: | |
Shen X.,Yuan X.,Li X.. A ubiquitous low-velocity layer at the base of the mantle transition zone[J]. Geophysical Research Letters,2014-01-01,41(3).
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