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| HAL : hal-00598587, version 1 |
| arXiv : 1106.1268 |
| DOI : 10.1785/0120100129 |
| Fiche détaillée |  Récupérer au format |
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| Bulletin of the Seismological Society of America 101, 3 (2011) pp.1073-1080 |
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| A Natural Seismic Isolating System: The Buried Mangrove Effects |
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| Philippe Gueguen 1, 2Mickael Langlais 1 |
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| (2011) |
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| The Belleplaine test site, located in the island of Guadeloupe (French Lesser Antilles) includes a three-accelerometer vertical array, designed for liquefac- tion studies. The seismic response of the soil column at the test site is computed using three methods: the spectral ratio method using the vertical array data, a numerical method using the geotechnical properties of the soil column, and an operative fre- quency domain decomposition (FDD) modal analysis method. The Belleplaine test site is characterized by a mangrove layer overlaid by a stiff sandy deposit. This con- figuration is widely found at the border coast of the Caribbean region, which is exposed to high seismic hazard. We show that the buried mangrove layer plays the role of an isolation system equivalent to those usually employed in earthquake engineering aimed at reducing the seismic shear forces by reducing the internal stress within the structure. In our case, the flexibility of the mangrove layer reduces the distortion and the stress in the sandy upper layer, and consequently reduces the potential of liquefaction of the site. |
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| 1 : | Institut des sciences de la Terre (ISTerre) |
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CNRS : UMR5275 – IFSTTAR – Université de Savoie – Université Joseph Fourier - Grenoble I – INSU – OSUG – IRD : UR219 |
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| 2 : | Laboratoire Central des Ponts et Chaussées (LCPC) |
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LCPC |
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| 3 : | Laboratoire sols, solides, structures - risques (3S-R) |
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CNRS : UMR5521 – Institut National Polytechnique de Grenoble (INPG) – Université Joseph Fourier - Grenoble I |
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| Domaine | : | Planète et Univers/Sciences de la Terre/Géophysique Physique/Physique/Géophysique Sciences de l'environnement/Milieux et Changements globaux |
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| seismology – modal analysis – site effects – Antilles |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00598587, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00598587 | |
| oai:hal.archives-ouvertes.fr:hal-00598587 | |
| Contributeur : Philippe Gueguen | |
| Soumis le : Mardi 7 Juin 2011, 09:21:34 | |
| Dernière modification le : Mardi 27 Mars 2012, 12:05:07 | |
