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TitreThe 23 July 2010 mN 4.1 Laurier-Station, Quebec, earthquake: a midcrustal tectonic earthquake occurrence unrelated to nearby underground natural gas storage
AuteurLamontagne, M; Keating, P; Bent, A; Peci, V; Drysdale, J
SourceSeismological Research Letters vol. 83, no. 5, 2012 p. 921-932,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110276
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC21E; 21L; 21M; 22H; 22I; 22P
Lat/Long OENS -74.0000 -70.0000 48.0000 45.0000
Sujetssecousses séismiques; magnitudes des séismes; mécanismes de tremblement de terre; études séismiques; géologie du substratum rocheux; interpretations sismiques; ondes sismiques; zones sismiques; sismicité; géophysique
Illustrationsseismograms; location maps
ProgrammeEastern Canada Geohazards Assessment Project, Géoscience pour la sécurité publique
Diffusé2012 09 06
Résumé(disponible en anglais seulement)
On 23 July 2010, at 17:24 coordinated universal time (13:24 local time), a Nuttli magnitude (mN) 4.1 (Mw 3.5) earthquake occurred near Laurier-Station, Quebec, approximately 40 km southwest of Quebec City, Quebec. The earthquake was widely felt by most people within 50 km of the epicenter and by some up to 170 km. The event had an oblique thrust mechanism at a depth of approximately 23.5 km. This focal depth indicates that the earthquake occurred in the Precambrian basement, much deeper than the 6-km-thick sedimentary layers at the surface. The earthquake could represent a reactivation of one of the regional normal faults imaged in the magnetic field and on reflection profiles. The immediate epicentral region is not very seismically active, and for this reason, the question arose as to whether local deep natural gas storage or shale gas hydraulic fracturing close to the area could have triggered the earthquake. The only aftershock-recorded mN 2.1 was within 2 hours of the mainshock and took place before a field instrument was in place. Based mainly on the mid-crustal focal depth of the earthquake, our study shows that the earthquake is not linked to the near-surface natural gas storage or to the shale gas hydraulic fracturing in the area.