Ambient seismic noise tomography of Canada and adjacent regions: Part I. Crustal structures
- H Kao (10126208)
- Y Behr (10120436)
- C Currie (10126211)
- R Hyndman (10126214)
- John Townend (8509452)
- FC Lin (10120400)
- M Ritzwoller (10126217)
- S Shan (10126220)
- J He (7713734)
DOIAbstract
This paper presents the first continental-scale study of the crust and upper mantle shear velocity (Vs) structure of Canada and adjacent regions using ambient noise tomography. Continuous waveform data recorded between 2003 and 2009 with 788 broadband seismograph stations in Canada and adjacent regions were used in the analysis. The higher primary frequency band of the ambient noise provides better resolution of crustal structures than previous tomographic models based on earthquake waveforms. Prominent low velocity anomalies are observed at shallow depths (<20 km) beneath the Gulf of St. Lawrence in east Canada, the sedimentary basins of west Canada, and the Cordillera. In contrast, the Canadian Shield exhibits high crustal velocities. We ...
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