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Contribution à la connaissance de l'aléa sismique dans les Antilles françaises: analyses des données sismologiques et accélérométriques régionales.

Abstract : The Lesser Antilles is an area of high volcanic and earthquake activity, characterized by a 1000 km convergence zone resulting from the Atlantic plate subduction under the Caribbean plate with a slow convergent motion (2 cm/year). With five years of available data, the CDSA data base presents a more homogeneous vision of Lesser Antilles arc seismicity and allows detecting low seismic activity zones, in the north near the Virgin Islands, and in the south between St-Lucia and Grenada. The accuracy improvements of location is used to better study the relationship between tectonic structures and seismicity, to better define the subduction slab geometry, and to analyse the spatial variations of the Gutenberg-Richter law b-value. Concerning the 21 november 2004 Les Saintes earthquake, EMS98 intensities in Les Saintes islands were evaluated from an individual request and hypocenter relocalisations of the Les Saintes earthquake and the biggest aftershock of 14 february 2005 were made using a method of master/slave in order to contrain the seismic source of the mainchock. As seismic hazard assessment depends from strong ground motion generated by earthquakes, the last part of this work concerns modeling accelerometric records of the Les Saintes earthquakes, combining a composite source model with an empirical Green Function technique. In our study, we used Les Saintes aftershocks as Empirical Green Function.
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https://tel.archives-ouvertes.fr/tel-00409021
Contributor : Mendy Bengoubou-Valerius <>
Submitted on : Tuesday, August 4, 2009 - 6:22:24 PM
Last modification on : Thursday, December 10, 2020 - 3:05:51 AM
Long-term archiving on: : Tuesday, June 15, 2010 - 8:34:30 PM

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  • HAL Id : tel-00409021, version 1

Citation

Mendy Bengoubou-Valerius. Contribution à la connaissance de l'aléa sismique dans les Antilles françaises: analyses des données sismologiques et accélérométriques régionales.. Planète et Univers [physics]. Université des Antilles-Guyane, 2008. Français. ⟨tel-00409021⟩

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