Global scale analysis and modelling of primary microseisms

Lucia Gualtieri, E. Stutzmann, C. Juretzek, C. Hadziioannou, F. Ardhuin

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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 frequencydependent 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.
Original languageEnglish (US)
Pages (from-to)560-572
Number of pages13
JournalGeophysical Journal International
Volume218
Issue number1
DOIs
StatePublished - Mar 28 2019
Externally publishedYes

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