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Modelling secondary microseismic noise by normal mode summation ArchiMer
Gualtieri, L.; Stutzmann, E.; Capdeville, Y.; Ardhuin, Fabrice; Schimmel, M.; Mangeney, A.; Morelli, A..
Secondary microseisms recorded by seismic stations are generated in the ocean by the interaction of ocean gravity waves. We present here the theory for modelling secondary microseismic noise by normal mode summation. We show that the noise sources can be modelled by vertical forces and how to derive them from a realistic ocean wave model. We then show how to compute bathymetry excitation effect in a realistic earth model by using normal modes and a comparison with Longuet-Higgins approach. The strongest excitation areas in the oceans depends on the bathymetry and period and are different for each seismic mode. Seismic noise is then modelled by normal mode summation considering varying bathymetry. We derive an attenuation model that enables to fit well the...
Tipo: Text Palavras-chave: Surface waves and free oscillations; Seismic attenuation; Theoretical seismology; Wave propagation.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00146/25703/24020.pdf
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