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| Becel, A.; Laigle, Mireille; Diaz, J.; Montagner, J. -p.; Hirn, A.. |
| Three unburied ocean bottom seismometers (OBS) equipped with Trillium 240 s broad-band seismometers recorded spheroidal free oscillations of the Earth out to periods over 1000 s period, for the M = 8.1, April 1, 2007 Solomon Islands earthquake. In contrast to broadband observatories of the global network that operate in quiet continental locations, these instruments were dropped on the several-km thick layer of sediments of the forearc and accretionary wedge of the Lesser Antilles subduction zone. Furthermore, a high ambient noise level due to the ocean surface infragravity waves is expected to cover the frequency band of Earth's normal modes band when recorded at these sites. In spite of these hostile environmental conditions, the frequency of clearly... |
| Tipo: Text |
Palavras-chave: Lesser Antilles; Broadband seismology; Free oscillations; Ocean bottom seismometers. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00185/29606/27971.pdf |
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