Data/hora: 01/06/2024 09:26:46

Provedor de dados: | 5
País: | France
Título: | How ocean waves rock the Earth: two mechanisms explain microseisms with periods 3 to 300 s
Autores: | Ardhuin, Fabrice; Gualtieri, Lucia; Stutzmann, Eleonore.
Data: | 2015-02
Ano: | 2015
Palavras-chave: | Hum; Infragravity waves; Numerical model; Microseisms.
Resumo: | Microseismic activity, recorded everywhere on Earth, is largely due to ocean waves. Recent progress has clearly identified sources of microseisms in the most energetic band, with periods from 3 to 10 s. In contrast, the generation of longer-period microseisms has been strongly debated. Two mechanisms have been proposed to explain seismic wave generation: a primary mechanism, by which ocean waves propagating over bottom slopes generate seismic waves, and a secondary mechanism which relies on the nonlinear interaction of ocean waves. Here we show that the primary mechanism explains the average power, frequency distribution, and most of the variability in signals recorded by vertical seismometers, for seismic periods ranging from 13 to 300 s. The secondary mechanism only explains seismic motions with periods shorter than 13 s. Our results build on a quantitative numerical model that gives access to time-varying maps of seismic noise sources.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00251/36219/34769.pdf

https://archimer.ifremer.fr/doc/00251/36219/34770.pdf

DOI:10.1002/2014GL062782

https://archimer.ifremer.fr/doc/00251/36219/

Editor: | Amer Geophysical Union
Formato: | application/pdf
Fonte: | Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2015-02 , Vol. 42 , N. 3 , P. 765-772

Fonte:

2015. American Geophysical Union. All Rights Reserved.

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