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Ardhuin, Fabrice. |
Primary microseisms are background seismic oscillations recorded everywhere on Earth with typical frequencies 0.05 < f < 0.1 Hz. They appear to be generated by ocean waves of the same frequency f, propagating over shallow bottom topography. Previous quantitative models for the generation of primary microseisms considered wave propagation over topographic features with either large scales, equivalent to a vertical point force, or small scales matching ocean wave wavelengths, equivalent to a horizontal force. While the first requires unrealistic bottom slopes to explain measured Rayleigh wave amplitudes, the second produced Love waves and not enough Rayleigh waves. Here we show how the small scales actually produce comparable horizontal and vertical... |
Tipo: Text |
Palavras-chave: Microseisms; Ocean waves; Topography; Sand waves. |
Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00461/57240/59237.pdf |
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Lanckneus, J.; De Moor, G.; Berné, S.; Chamley, H.; De Batist, M.; Henriet, J.-P.; Terwindt, J.; Trentesaux, A.. |
The paper analyses the first results obtained in the framework of the RESECUSED project (MAST) whose objectives are the detailed analysis of the behaviour of sediments and bedforms of and on the Middelkerke Bank (Belgian Continental Shelf) and the study of the interaction between water movement, sediment transport and bedform mobility. The results include a preliminary analysis of the residual bottom load transport paths deduced from side scan sonar registrations, a map of the sandwaves on the bank, the first grain-size results of the superficial sediment and a study on the internal structure of the bank. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bed forms; Continental shelves; Grain size; Granulometry; Sand waves; Sediment dynamics; Sediment transport; Shelf facies; Side scan sonar. |
Ano: 1991 |
URL: http://www.vliz.be/imisdocs/publications/262327.pdf |
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