Journal
COMPTES RENDUS GEOSCIENCE
Volume 343, Issue 8-9, Pages 548-557Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crte.2011.04.005
Keywords
Ocean microseism; Time-dependent noise tomography; USA
Categories
Funding
- National Aeronautics and Space Administration
- National Science Foundation [EAR-0838247]
- internal Research and Technology Development program
- Division Of Earth Sciences
- Directorate For Geosciences [0838247] Funding Source: National Science Foundation
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A qualitative analysis of ocean microseism source distribution observed in North America during fall and winter months was carried out. I review the theory of the origin of ocean microseisms and show that it can be used in conjunction with wave-wave interaction maps to quantify the source distribution anisotropy. It is demonstrated that microseisms generation in the North Atlantic and in the North Pacific Oceans are inherently different. North Atlantic microseisms are generated predominantly in the deep ocean, while North Pacific microseisms are dominated by coastal reflections. In spite of these differences both result from repeated ocean wave patterns that give rise to an anisotropic noise pattern, which cannot be randomized by time averaging. Considering time-varying ambient noise imaging, which aims to resolve a fraction of a percent changes in the crust over short distances, the source anisotropy would introduce a relatively significant error that needs to be accounted for. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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