Global scale analysis and modelling of primary microseisms - Archive ouverte HAL Access content directly
Journal Articles Geophysical Journal International Year : 2019

Global scale analysis and modelling of primary microseisms

, (1) , , , (2)
1
2
L. Gualtieri
  • Function : Author
C. Juretzek
  • Function : Author
C. Hadziioannou
  • Function : Author

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.
Fichier principal
Vignette du fichier
62990.pdf (4.26 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03586638 , version 1 (24-02-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

L. Gualtieri, E. Stutzmann, C. Juretzek, C. Hadziioannou, F. Ardhuin. Global scale analysis and modelling of primary microseisms. Geophysical Journal International, 2019, 218, pp.560-572. ⟨10.1093/gji/ggz161⟩. ⟨insu-03586638⟩
12 View
7 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More