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TitreFocal mechanisms and depths of aftershocks of the 2010 Haiti earthquake
AuteurBent, A L
SourceCommission géologique du Canada, Dossier public 6713, 2011, 32 pages,
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Lat/Long OENS-74.0000 -72.0000 18.7500 17.0000
Sujetssecousses séismiques; magnitudes des séismes; foyers des séismes; études séismiques; risque de tremblement de terre; sismicité; sismographes; réseau sismique; séismologie; risque sismique; répliques sismiques; géophysique
Illustrationslocation maps; graphs; plots; stereonets; tables
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
ProgrammeService d'information sur les dangers naturels au Canada, Service d'information sur les dangers naturels au Canada
Diffusé2011 03 01
Résumé(disponible en anglais seulement)
The devastating magnitude 7.0 earthquake that struck Haiti on 12 January 2010 was followed by hundreds of aftershocks. The largest were recorded at regional to teleseismic distances. The smaller aftershocks were not recorded in the days immediately following the mainshock as there was no seismic monitoring capacity within Haiti. With the installation of a real time three-station network in Haiti by the GSC in mid-February the ability to monitor the aftershocks was vastly improved. Using the new Haitian stations as well as existing stations elsewhere in the Caribbean, focal mechanisms and depths of many of the aftershocks can be determined, both of which provide insight into the seismotectonics of the region and implications for future seismic hazard assessments. This paper summarizes the focal mechanisms and depths of the larger (magnitude ? 4.5) aftershocks determined by regional moment tensor inversion and the focal mechanisms of the smaller aftershocks determined by a composite first motion inversion. The results are consistent with the teleseismically determined focal mechanisms of the mainshock and largest aftershock and provide further evidence for a complex faulting regime consisting of strike-slip faulting in the east of the aftershock zone where the mainshock initiated and thrust faulting in the west where the largest number of aftershocks has occurred.