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Tracking major storms from microseismic and hydroacoustic observations on the seafloor ArchiMer
Davy, Celine; Barruol, Guilhem; Fontaine, Fabrice R.; Sigloch, Karin; Stutzmann, Eleonore.
Ocean wave activity excites seismic waves that propagate through the solid earth, known as microseismic noise. Here we use a network of 57 ocean bottom seismometers (OBS) deployed around La Réunion Island in the southwest Indian Ocean to investigate the noise generated in the secondary microseismic band as a tropical cyclone moved over the network. Spectral and polarization analyses show that microseisms strongly increase in the 0.1–0.35 Hz frequency band as the cyclone approaches and that this noise is composed of both compressional and surface waves, confirming theoretical predictions. We infer the location of maximum noise amplitude in space and time and show that it roughly coincides with the location of maximum ocean wave interactions. Although this...
Tipo: Text Palavras-chave: Microseismic noise; Ocean bottom seismometers (OBS); Major storms; Indian Ocean; Hydroacoustic; Rayleigh waves.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00287/39824/38331.pdf
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