DOI: 10.1002/2016GL070286
论文题名: Scattered energy from a rough core-mantle boundary modeled by a Monte Carlo seismic particle method: Application to PKKP precursors
作者: Mancinelli N. ; Shearer P.
刊名: Geophysical Research Letters
ISSN: 0094-8792
EISSN: 1944-8523
出版年: 2016
卷: 43, 期: 15 起始页码: 7963
结束页码: 7972
语种: 英语
英文关键词: core-mantle boundary
; interface topography
; outer-core structure
; scattering
Scopus关键词: Monte Carlo methods
; Scattering
; Seismology
; Core structure
; Core-mantle boundary
; Correlation lengths
; Interface topography
; Range dependence
; Relative amplitude
; Seismic velocity models
; Velocity gradients
; Topography
英文摘要: We stack a large global data set of 1 Hz PKKP waveforms to constrain globally averaged properties of PKKP precursors. We find that the precursor observations are better explained by scattering from core-mantle boundary (CMB) topography than by scattering from the near surface, lower mantle, outer core, or inner core. However, as previously noted, simple models of CMB topography and standard 1-D seismic velocity models fail to model the range dependence of the relative amplitude between PKKPbc and its precursors. We find that this systematic mismatch is due, at least in part, to the assumed velocity gradient in the lowermost 250 km of the outer core. Our globally averaged PKKP precursor observations are consistent with random CMB topography with RMS variations of ∼390 m and a horizontal correlation length of ∼7 km. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84983488867&doi=10.1002%2f2016GL070286&partnerID=40&md5=a481e24469cc55e7f83f7d3cc1f5274c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9755
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 Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Mancinelli N.,Shearer P.. Scattered energy from a rough core-mantle boundary modeled by a Monte Carlo seismic particle method: Application to PKKP precursors[J]. Geophysical Research Letters,2016-01-01,43(15).