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| 2004 Les Saintes earthquake | |
|---|---|
| Name | 2004 Les Saintes earthquake |
| Date | 2004-11-21 |
| Time | 06:41:00 |
| Magnitude | 6.3 |
| Depth | 10 km |
| Affected | Guadeloupe, Les Saintes, Antigua and Barbuda, Dominica |
| Casualties | 2–3 dead, dozens injured |
2004 Les Saintes earthquake The 2004 Les Saintes earthquake was a moment magnitude ~6.3 seismic event that struck near the archipelago of Les Saintes in the Lesser Antilles on 21 November 2004. It produced strong shaking across Guadeloupe, perceptible tremors in Dominica and Antigua and Barbuda, and generated regional concern among institutions such as the United States Geological Survey, Institut de Physique du Globe de Paris, and Centre National de la Recherche Scientifique. The event prompted emergency response from the Préfecture de la Guadeloupe, coordination with the European Union Civil Protection Mechanism, and scientific investigation by researchers affiliated with Université des Antilles and international teams.
The earthquake occurred along the subduction and transform systems that shape the Lesser Antilles Volcanic Arc and the eastern Caribbean boundary between the North American Plate and the Caribbean Plate. Regional tectonics include the northward motion of the South American Plate relative to the Caribbean Plate and complexities introduced by the nearby Puerto Rico Trench, the Anegada Passage, and the fracture zones that link to the Greater Antilles. Historical seismicity in the region includes the 1843 Antigua earthquake, the 1843 Guadeloupe earthquake, the 1966 Dominica earthquake, and the 1997 Montserrat earthquake, all illustrating the seismic hazard posed to islands such as Basse-Terre (Guadeloupe), Terre-de-Haut and Terre-de-Bas. Local geology involves volcanic edifices like La Grande Soufrière, reef platforms around Marie-Galante, and sedimentary basins that influence shaking intensity and tsunami potential.
Seismological analyses by the United States Geological Survey, Institut de Physique du Globe de Paris, and teams from Université Paris Diderot estimated a focal depth of roughly 10 km and a moment magnitude in the mid-6 range, with focal mechanisms consistent with shallow thrust or oblique-reverse faulting along the plate interface. Deployments of broadband seismometers by the Seismological Research Centre and field measurements by the Observatoire Volcanologique et Sismologique de Guadeloupe recorded strong ground motion, peak ground accelerations, and frequency content that were compared against attenuation models developed by the European Seismological Commission and the International Seismological Centre. Geodetic data from local GPS stations operated by Institut national des sciences appliquées and crustal deformation studies supported rupture dimensions limited to a few tens of kilometers, consistent with finite-fault models published in journals associated with American Geophysical Union meetings.
The earthquake caused structural damage on Basse-Terre (Guadeloupe), in the town of Pointe-à-Pitre, on the islands of Les Saintes, and on neighboring islands including Dominica and Antigua and Barbuda. Reports from the Red Cross delegation in Guadeloupe and the Agence France-Presse dispatches detailed collapsed masonry, cracked masonry churches, damaged historic buildings such as colonial-era forts, and interrupted utilities managed by Société Guadeloupéenne d'Énergie. Casualties reported by the Préfecture de la Guadeloupe and the Ministry of Overseas France numbered a small number of fatalities and dozens injured, with numerous residents displaced to shelters organized by Croix-Rouge française and municipal authorities in Trois-Rivières and Saint-Claude. Economic disruption affected tourism centers including Porte d'Enfer, ferry services linking Les Saintes to Basse-Terre, and infrastructure such as ports overseen by the Port of Pointe-à-Pitre authority.
A prominent aftershock sequence followed, recorded by networks coordinated by the Seismological Research Unit and regional observatories; dozens of events with magnitudes up to approximately M5.0 occurred over subsequent days and weeks. The temporal decay of aftershocks conformed broadly to Omori-type behavior studied in publications from the Seismological Society of America and presentations at conferences of the European Geosciences Union. These aftershocks were located along faults mapped in bathymetric surveys conducted by the French Naval Hydrographic and Oceanographic Service and by seismic reflection profiles used by research groups at Institut de Recherche pour le Développement and IFREMER.
Emergency response involved local civil protection authorities in Guadeloupe, coordination with the Direction Générale de la Sécurité Civile et de la Gestion des Crises in metropolitan France, and humanitarian assistance from humanitarian organizations including Médecins Sans Frontières and International Federation of Red Cross and Red Crescent Societies. Reconstruction programs received oversight from the Conseil Général de la Guadeloupe and were informed by engineering assessments from institutions such as École Centrale Paris and the Bureau de Recherches Géologiques et Minières. Recovery prioritized restoration of lifelines managed by Société Guadeloupéenne d'Électricité and retrofitting of cultural heritage sites like the Citadelle du Moule. Financial aid and risk mitigation funding involved agencies including the European Investment Bank and coordination with the Ministry of Overseas France for rebuilding resilient infrastructure.
The earthquake stimulated multidisciplinary research on Caribbean subduction processes, seismic hazard assessment, and tsunami potential by teams from Institut de Physique du Globe de Paris, Université des Antilles, IFREMER, and international partners including National Oceanic and Atmospheric Administration, Lamont–Doherty Earth Observatory, and Scripps Institution of Oceanography. Studies published in venues associated with the American Geophysical Union, Geophysical Research Letters, and the Journal of Geophysical Research used waveform inversion, finite-fault modeling, and GPS deformation to refine seismic source parameters and to reassess seismic hazard maps produced by the European Seismic Hazard Model and local authorities. The sequence also contributed data to global catalogs maintained by the International Seismological Centre and influenced updates to building codes applicable in overseas departments, with policy discussions referenced in publications by the World Bank and the Inter-American Development Bank.
Category:Earthquakes in Guadeloupe Category:2004 earthquakes Category:2004 in Guadeloupe