Résumé
The deployment of temporary seismic networks, notably the EarthScope USArray‐Transportable Array, has drastically improved the station coverage across northwestern Canada over the past decade, enabling the application of high‐resolution passive‐source seismic methods. This chapter highlights the main discoveries pertaining to the seismic velocity structure, origin, and deformation of the lithosphere in the northern Canadian Cordillera (NCC). High‐resolution seismic tomography models reveal that the lower crust in the NCC is marked by low‐velocity anomalies extending from the Gulf of Alaska to the Cordilleran deformation front, which is interpreted to reflect elevated temperatures that buoyantly support regional high elevations and potentially represent the seismic signature of strain transfer from the Yakutat collision zone to the Mackenzie Mountains. The Moho is relatively flat and shallow across the NCC and is underlain by a thin layer of mantle lithosphere. Seismic velocity models further unveiled large‐scale mantle structures associated with the unexposed Mackenzie craton in the north, and the Liard Transfer Zone in the south, which appear to buttress the NCC and focus deformation in the eastern NCC. Seismic anisotropy and tomography provide evidence that the Tintina and Denali faults penetrate into the lithospheric mantle and played a first‐order role in shaping the present‐day NCC.