Aspherical structure of the core‐mantle boundary fromPKPtravel times
作者:
Kenneth C. Creager,
Thomas H. Jordan,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 13
页码: 1497-1500
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i013p01497
数据来源: WILEY
摘要:
Maps of aspherical structure in the vicinity of the core‐mantle boundary have been constructed from a tomographic analysis ofP′DFandP′ABtravel times in the distance range 150°‐180°. These maps reveal long‐wavelength features not previously detected by mantle tomography. The peak‐to‐peak amplitude of these features is on the order of 1 s in vertical travel time, too large to be explained by conventional thermal boundary layer models or dynamically supported topography on the core‐mantle boundary. We hypothesize the existence of one or more chemical boundary layers whose large‐scale accumulations on the surface of the core may in some ways be analogous to continents at
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