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Titel |
The Mw = 6.3, November 21, 2004, Les Saintes earthquake (Guadeloupe): Tectonic setting and static stress modeling |
VerfasserIn |
Nathalie Feuillet, François Beauducel, Eric Jacques, Paul Tapponnier , Sara Bazin, Bertrand Delouis, Martin Vallée, Geoffrey C. P. King |
Konferenz |
EGU General Assembly 2010
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 12 (2010) |
Datensatznummer |
250041949
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Zusammenfassung |
On November 21, 2004, a magnitude 6.3 earthquake occurred offshore, 10-km south of Les
Saintes archipelago in Guadeloupe (FWI). The ensuing seismic sequence lasted more than
two years, with several tens of earthquakes still recorded monthly today by the Lesser
Antilles monitoring network. There were more than 30,000 aftershocks, most of them at
shallow depth near the islands of the archipelago. The main shock and its main aftershock of
February 14, 2005 (Mw = 5.8) ruptured a normal fault (Roseau fault) mapped and identified
as active from high-resolution bathymetric data a few years before. This fault belongs to an
arc-parallel en echelon fault system that follows the inner edge of the northern part
of the Lesser Antilles arc, accommodating the sinistral component of the oblique
convergence between the North American and Caribbean plates. The distribution of
aftershocks and damage (destruction and landslides) are consistent with the fault
location. The main shock increased the Coulomb stress at the tips of the ruptured
plane by more than 4 bar where most of the aftershocks occurred. Following the
November 21, 2004 earthquake, however, no increase in volcanic or geothermal
activity at Guadeloupe’s Soufrière volcano has yet been observed. This is somewhat
surprising, since the Boiling Lake in Dominica drained twice probably as a result of
the extensional strain induced by the latter earthquake and its main aftershock. |
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