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Author
L. Gualtieri, E. Stutzmann, C. Juretzek, C. Hadziioannou, F. Ardhuin
Title
Global scale analysis and modelling of primary microseisms
Type
Journal
Year
2019
Publication
Geophysical Journal International
Abbreviated Journal
Volume
218
Issue
1
Pages
560-572
Keywords
Abstract
Primary microseism is the less studied seismic background vibration of the Earth. Evidence points to sources caused by ocean gravity waves coupling with the seafloor topography. As a result, these sources should be in water depth smaller than the wavelength of ocean waves. Using a state-of-the-art ocean wave model, we carry out the first global-scale seismic modelling of the vertical-component power spectral density of primary microseisms. Our modelling allows us to infer that the observed weak seasonality of primary microseisms in the southern hemisphere corresponds to a weak local seasonality of the sources. Moreover, a systematic analysis of the source regions that mostly contribute to each station reveals that stations on both the east and west sides of the North Atlantic Ocean are sensitive to frequency-dependent source regions. At low frequency (i.e. 0.05 Hz), the dominant source regions can be located thousands of kilometres away from the stations. This observation suggests that identifying the source regions of primary microseisms at the closest coasts can be misleading.
Programme
133
Campaign
Address
Corporate Author
Thesis
Bachelor's thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
0956-540X
ISBN
0956-540X
Medium
Area
Expedition
Conference
Notes
Approved
yes
Call Number
Serial
7478
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