GEOSCAN, résultats de la recherche


TitrePOLARIS: portable observatories for lithospheric analysis and research investigating seismicity - a Canadian proposal
AuteurCassidy, J F; Atkinson, G M; Bostock, M G; Eaton, D W; Asudeh, I; Snyder, D; Jones, A G; Adams, J; Ferguson, I J; Thomson, C J
SourceSeismological Research Letters vol. 71, 2000, 1 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090170
RéunionSeismological Society of America Annual Meeting; San Diego, CA; US; avril 9-12, 2000
Documentpublication en série
Mediapapier; en ligne; numérique
Sujetsbassins; analyses du bassin; levés sismiques; interpretations sismiques; techniques de cartographie; lithosphère; croûte continentale; géophysique
Résumé(disponible en anglais seulement)
POLARIS is a multi-institutional 10M$ proposal to the Canadian Foundation for Innovation for the creation of new, state-of-the-art portable geophysical observatories for research into lithospheric structure, continental dynamics, and earthquake hazards in Canada. The proposal brings together Universities, Governments, and Industry from across Canada. POLARIS infrastructure will comprise 108 three-component broadband seismographs and 30 magnetotelluric (MT) mobile field systems and complementary satellite telemetry data acquistion systems. Over the initial four year installation of this project, the seismograph network will be deployed as three subarrays of 36 instruments each. The MT instruments will be used in shorter-term deployments at each of the three seismic subarrays for lithospheric imaging, and continuous recording at selected elements for deep-mantle imaging. The initial scientific objectives include: 1) three-dimensional detailed mapping of the asthenosphere and upper mantle of the Slave Province in Canada's north to assist the emerging diamond industry; 2) mapping lithospheric structure and earthquake hazards in the heavily populated area of southern Ontario (identifying zones of crustal weakness, obtaining accurate earthquake parameters, and ground motion attenuation studies). 3) mapping the structure and earthquake hazards over the Cascadia subduction zone in southwest British Columbia (subducting oceanic plate, site-response in urban areas, identifying active crustal faults, and seismic attenuation studies). Further research initiaves that will be possible include: testing Rapid Warning Systems for ground shaking in the urban areas of Canada; developing new fine-scale imaging techniques using the scattered wavefield; and investigating geomagnetically induced currents that can cause major disruptions to electrical and pipeline infrastructure.