DOI: 10.1002/2015GL063989
论文题名: D″ discontinuity structure beneath the North Atlantic from Scd observations
作者: Yao Y. ; Whittaker S. ; Thorne M.S.
刊名: Geophysical Research Letters
ISSN: 0094-9371
EISSN: 1944-9102
出版年: 2015
卷: 42, 期: 10 起始页码: 3793
结束页码: 3801
语种: 英语
英文关键词: array
; body waves
; core-mantle boundary
; mantle discontinuities
Scopus关键词: Earth sciences
; Geophysics
; Array
; Body waves
; Broadband station
; Core-mantle boundary
; Discontinuity structures
; Mantle discontinuities
; North Atlantic Ocean
; Radial component
; Earthquakes
; amplitude
; body wave
; core-mantle boundary
; discontinuity layer
; earthquake magnitude
; geophysical array
; mantle discontinuity
; seismogram
; Atlantic Ocean
; Atlantic Ocean (North)
; California
; Farallon Islands
; North America
; United States
; Vespa
英文摘要: We analyzed transverse and radial component recordings from the 2010 M6.3 southern Spain earthquake (depth = 620 km) recorded on 370 broadband stations in North America. We grouped these seismograms into subarrays and applied fourth root vespa processing (vespagram analysis) in order to enhance low-amplitude arrivals. These vespagrams show clear Scd arrivals which indicate the existence of the D″ discontinuity beneath the North Atlantic Ocean (45-60°N, 45-55°W). These observations are best fit with a +2-4% velocity increase at the top of the D″ discontinuity at a height above the core-mantle boundary of 304 ± 14 km. We do not observe Scd arrivals at the eastern end of our study region which is consistent with the presence of the easternmost edge of the ancient Farallon plate. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931563760&doi=10.1002%2f2015GL063989&partnerID=40&md5=d3fe81b88dd67b3b9a570fa36ca57025
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8986
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Yao Y.,Whittaker S.,Thorne M.S.. D″ discontinuity structure beneath the North Atlantic from Scd observations[J]. Geophysical Research Letters,2015-01-01,42(10).