Surface-Wave Tomography of Western Canada Using a Two-station Approach

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dc.contributor.authorZaporozan, Taras
dc.contributor.examiningcommitteeFerguson, Ian (Geological Sciences) Audet, Pascal (University of Ottawa)en_US
dc.contributor.supervisorFrederiksen, Andrew (Geological Sciences)en_US
dc.date.accessioned2017-01-05T18:03:10Z
dc.date.available2017-01-05T18:03:10Z
dc.date.issued2017
dc.degree.disciplineGeological Sciencesen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractSeismic data from 106 station pair-paths, from the CNSN (Canadian National Seismic Network) and POLARIS (Portable Observatories for Lithospheric Analysis and Research Investigating Seismicity) seismic networks, were used to measure surface waves from earthquake events. Fundamental-mode Rayleigh-wave dispersion curves were generated and inverted to obtain dispersion maps and S-velocity cross-sections. Results show a clear distinction between the Cordilleran and cratonic lithospheres. The Cordilleran lithopshere shows a low-velocity perturbation with values ranging from -2% to -5%, while the cratonic lithosphere shows a high-velocity perturbation with values ranging from 3% to 9%. The large range in perturbation between the Cordilleran and cratonic lithospheres resolves the Cordilleran/craton boundary, showing that the boundary is present down to 200 km in depth and dips under the cratonic lithosphere. A high-velocity anomaly within the already high velocity cratonic lithosphere is present under Great Slave Lake and is interpreted as preserved Precambrian slab material. Many small high-velocity perturbations, reaching about 4%, are present at depths of 300+ km throughout the survey, and interpreted as being remnants of the Kula or Farallon plates.en_US
dc.description.noteFebruary 2017en_US
dc.identifier.urihttp://hdl.handle.net/1993/31983
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectTomographyen_US
dc.subjectCordilleraen_US
dc.subjectGeophysicsen_US
dc.subjectCordilleran Deformation Fronten_US
dc.subjectTwo-stationen_US
dc.subjectSeismologyen_US
dc.subjectCratonen_US
dc.titleSurface-Wave Tomography of Western Canada Using a Two-station Approachen_US
dc.typemaster thesisen_US
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