DOI: 10.1002/grl.50257
论文题名: Broadband array observations of the 300 km seismic discontinuity
作者: Schmerr N.C. ; Kelly B.M. ; Thorne M.S.
刊名: Geophysical Research Letters
ISSN: 0094-9264
EISSN: 1944-8995
出版年: 2013
卷: 40, 期: 5 起始页码: 841
结束页码: 846
语种: 英语
英文关键词: 300 km discontinuity
; basalt
; EarthScope
; eclogite
; High Lava Plains Seismic Experiment
; SS and PP precursors
; wave propagation
Scopus关键词: 300 km discontinuity
; EarthScope
; Eclogites
; Finite difference model
; Lateral variations
; Numerical experiments
; Seismic discontinuities
; SS and PP precursors
; Basalt
; Experiments
; Metamorphic rocks
; Structural geology
; Wave propagation
; Seismology
; broadband data
; discontinuity
; experimental study
; finite difference method
; numerical model
; seismic moment
; wave propagation
; Pacific Ocean
; South America
英文摘要: Intermittent seismic discontinuities near 250-300 km depth beneath South America and the Pacific basin are detected with high-resolution seismic array methods that use SS and PP precursors recorded at the High Lava Plains Seismic Experiment and the EarthScope Transportable Array. The transformation of coesite to stishovite in an eclogite-rich mantle composition produces a seismic discontinuity near 300 km depth; lateral changes in basalt fraction of the upper mantle will thus produce an intermittent seismic discontinuity. The sensitivity of the precursors to intermittent seismic structure is addressed using an axisymmetric finite difference model of wave propagation in the mantle. These numerical experiments find that the precursors are sensitive to structures ≥500 km in lateral extent and that the observations of this discontinuity are plausibly tied to lateral variations in basaltic composition of the upper mantle related to dynamics, such as plumes and subduction. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876782453&doi=10.1002%2fgrl.50257&partnerID=40&md5=bdbd17d64868e9079250068dccb2ee8b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6528
Appears in Collections: 气候减缓与适应
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作者单位: NASA Goddard Space Flight Center, Planetary Geodynamics Laboratory, Code 698, Greenbelt, MD 20771, United States
Recommended Citation:
Schmerr N.C.,Kelly B.M.,Thorne M.S.. Broadband array observations of the 300 km seismic discontinuity[J]. Geophysical Research Letters,2013-01-01,40(5).