GEOSCAN, résultats de la recherche


TitreMonitoring the earthquake activity in New Brunswick to help define the level of background activity and its source characteristics
AuteurLamontagne, M; Lavoie, D; Ma, S; Burke, K B S
SourceNew Brunswick Exploration, Mining and Petroleum conference program and abstracts volume; 2014 p. 62
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140203
Éditeurtment of Mines and Energy New Brunswick
RéunionNew Brunswick Exploration, Mining and Petroleum Conference 2014; Fredericton; CA; Novembre 2-4, 2014
Mediaen ligne; numérique
SNRC21G; 21H; 21I; 21J; 21O; 21P
Lat/Long OENS -68.0000 -64.0000 48.0000 45.0000
Sujetssecousses séismiques; magnitudes des séismes; risque sismique; risque de tremblement de terre; schistes; gaz; sismographes; géophysique; combustibles fossiles
ProgrammeGaz de schiste - sismicité, Géosciences environnementales
Résumé(disponible en anglais seulement)
Shale gas projects at the Geological Survey of Canada are part of two research programs: Geoscience for New Energy Supply (resource evaluation and characterization) and Environmental Geoscience (groundwater and induced seismicity). Research activities are directly in line with the May 2014 recommendations for geological investigations put for ward in the Canadian Council of Academies' report of potential environmental impacts of shale gas development. In New Brunswick, one project completed in March 2014 presented a synthesis of available geological and hydrogeological data for sedimentary basi ns as well as a study of groundwater over the McCully gas field. A second project, initiated in 2012 aims at defining the regional natural seismicity of the Moncton and Sussex sub - basins of southern New - Brunswick prior to an eventual full - scale hydraulic f racturing program in this area. New Brunswick has a low level of naturally occurring, small magnitude earthquakes. Prior to 1980, however, five events had magnitudes estimated in the Nuttli magnitude (mN ) 5.4 - 6.0 range; two in the Central Highlands, two in Passamaquoddy Bay region and one near Moncton (1855; magnitude 5.4). The latter was strong enough to cause some chimney and road damage. Since 1980, the earthquake activity has been routinely monitored by the Canadian National Seismograph Network (CNSN) . This network provides earthquake location completeness slightly better than magnitude (mN) 2.0. Three earthquakes with magnitudes in the 5 to 6 range were recorded in the Central Highlands in 1982. To better monitor the Sussex Basin area, five additiona l seismographs with broadband sensors were installed (one in 2012 and four in 2013) to complement the CNSN. The area is currently monitored by a dense six - station seismograph network that can provide the background seismicity level and allows for the calcu lation of focal depths. Since 2010, only one seismic event in the Sussex Basin was recorded but the long period between its occurrence and hydraulic fracturing at McCully field (almost two years) makes a connection unlikely. A study is currently underway t o define the depth distribution of earthquakes in SE NB using conversional and regional depth phase modeling (rdpm) methods.
Résumé(Résumé en langage clair et simple, non publié)
Cette présentation invitée discutera de notre connaissance actuelle de la sismicité naturelle dans le sud du Nouveau-Brunswick sur la base de données historique et notre suivi actuel basé sur le réseau dense de seismographes récemment installé. Cette recherche fournira les données de base avant les activités de fracturation hydraulique.