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Geosciences 2018, 8(9), 336; https://doi.org/10.3390/geosciences8090336

Combined Geophysical and Geotechnical Approaches for Microzonation Studies in Hispaniola Island

1
Seismic and Volcanic Risk Unit, Risk and Prevention Division, BRGM, 3, Avenue Claude Guillemin, BP 36009, 45060 Orléans Cedex 2, France
2
Servicio Geológico Nacional de República Dominicana, Ensanche Piantini 10148, Santo Domingo, República Dominicana
3
Bureau des Mines et de l’Energie, P. O. Box 2174, Port-au-Prince, Haiti
*
Author to whom correspondence should be addressed.
Received: 6 April 2018 / Revised: 28 August 2018 / Accepted: 28 August 2018 / Published: 5 September 2018
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Abstract

In this paper, we describe recent studies for the geophysical and geomechanical characterization of soils in Hispaniola (Greater Antilles), an island threatened by the eventual rupture of major seismogenic fault systems. The investigations were performed for four different cities settled on complex geological formations in Haiti (Cap-Haïtien, Port-au-Prince) and the Dominican Republic (Santo Domingo, Santiago de los Caballeros). We present the complete methodology we implemented for mapping zones of homogeneous seismic response and for microzonation studies, but each main stage of investigation is described as it was conducted in one or two cities. Therefore, first we present our site-characterization technique applied to Santo Domingo and Santiago de los Caballeros, which is based on geotechnical data, geophysical multichannel analysis of surface waves, and ambient-noise recordings. Then we present the site-response analysis through numerical analysis with nonlinear soil models that we performed for the city of Cap-Haïtien. Finally, we describe the amplification factors for site-specific response spectra that we derived for the microzonation of Port-au-Prince. We argue for the implementation of a multidisciplinary approach built upon complementary field geological, geophysical, and geotechnical data rather than solely depending on geophysical measures for the characterization of VS30. In addition, we explore the compatibility of the soil classes recommended by the International Building Code (IBC) in the context of local seismic amplification. View Full-Text
Keywords: site effects; microzonation; site characterization; site response; geophysical techniques; design spectra site effects; microzonation; site characterization; site response; geophysical techniques; design spectra
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Belvaux, M.; Meza-Fajardo, K.; Abad, J.; Bertil, D.; Roullé, A.; Muñoz, S.; Prépetit, C. Combined Geophysical and Geotechnical Approaches for Microzonation Studies in Hispaniola Island. Geosciences 2018, 8, 336.

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