Seismic Microzonation: A Comparison between Geotechnical and Seismological Approaches in Pointe-à-Pitre (French West Indies) |
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| Authors: | Benoit LeBrun Anne-Marie Duval Pierre-Yves Bard Olivier Monge Myriam Bour Sylvain Vidal Hubert Fabriol |
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| Institution: | (1) BRGM, 117 av. de Luminy, F 13276, MARSEILLE Cedex, 9;(2) CETE Méditerranée, 56 bd Stalingrad, F 06359, Nice Cedex, 4;(3) LCPC, 58, bd Lefebvre, F 75732, PARIS Cedex, 15;(4) GeoTer International, Espace 890, Route Nationale 96, 890, F 13360, Roquevaire, France |
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| Abstract: | Pointe-à-Pitre, the main city of Guadeloupe in the French West Indies, has on several occasions been partially destroyed by
major historical earthquakes. Moreover, a post-seismic assessment of the damage from the 1985 Montserrat earthquake indicates
that the town is prone to site effects. Consequently, from 1996 to 1998, BRGM conducted a seismic microzonation study based
on geotechnical and geological data. At the same time, three seismological studies were being conducted – two based on earthquake
recordings using a time-series analysis and the classical spectral ratio (CSR) method (CETE/LCPC and BRGM), and the third
based on noise measurement at 400 points using the horizontal-to-vertical noise ratio (HVNR) method (CETE/LCPC). The objective
of this paper is not to carry out a new microzonation study by taking into account all the results, but rather to show in
what respects the results of these different methods are in agreement or not. A comparison of the results of the seismological
studies with the geotechnical microzonation shows that they are in fairly good agreement, albeit with some discrepancies.
The results indicate that the seismological methods and the geotechnical data are highly complementary and should be used
together in compiling seismic transfer-function microzonation maps.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Guadeloupe H/V technique microzonation spectral ratio transfer function |
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