Canadian Cordillera

Cordilleras are the site of tectonic accretion and mountain building through the sustained action of convergent tectonic forces. In northwestern Canada, research into the architecture of the Canadian Cordillera has been historically limited by sparse geophysical monitoring infrastructure. In 2012, our group established a CFI-funded network of broadband seismograph stations (Yukon-Northwest Seismograph Network, YNSN) that provide open, continuous data in real time across northwestern Canada. Led by former Banting Fellow A. Schaeffer and colleagues at the Northwest Territories Geological Survey, our group installed an additional network of stations on Banks Island, NT, in the western Canadian Arctic (Banks Island Seismic Network, BISN). Results from these studies are accumulating fast and our group has made outstanding discoveries on the structure and dynamics of the lithosphere in the Cordillera. Specifically, we has found conclusive evidence that hidden processes in the lithospheric mantle play a dominant role in shaping the Canadian Cordillera.

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Pascal Audet
Associate Professor of Geophysics & University Research Chair

Publications

Moho variations across the northern Canadian Cordillera

Moho morphology in orogens provides important constraints on the rheology and density structure of the crust and underlying mantle. …

The upper mantle structure of northwestern Canada from teleseismic body wave tomography

The Northern Canadian Cordillera (NCC) is an actively deforming orogenic belt in northwestern Canada. Geochemical and geophysical data …

Seismic evidence for a mantle suture and implications for the origin of the Canadian Cordillera

The origin of the North American Cordillera and its affinity with the bounding craton are subjects of contentious debate. The …

Seismic evidence for lithospheric thinning and heat in the Northern Canadian Cordillera

Geophysical and geological data indicate that the lithosphere in the northern Canadian Cordillera (NCC) is thin and hot. However, lack …

Mapping Curie depth across western Canada from a wavelet analysis of magnetic anomaly data

In western Canada, geophysical studies infer an abrupt change in crustal temperatures between the Canadian Cordillera and the adjacent …

Deep crustal earthquakes in the Beaufort Sea, western Canadian arctic, from teleseismic depth phase analysis

The Beaufort Sea seismic cluster in the western Canadian Arctic is an active seismic zone characterized by approximately one magnitude …

Structure and fabric of the crust and uppermost mantle in the northern Canadian Cordillera from Rayleigh-wave tomography

The seismic structure and fabric of the lithosphere and underlying mantle beneath the northern Canadian Cordillera provides important …

Source Properties of the 16 July 2014 Magnitude ∼4.5 Double Earthquakes in the Northern Canadian Cordillera

On 16 July 2014, two moderate earthquakes with similar body‐wave magnitude (⁠MB 4.5 and 4.6) and epicentral location occurred within 9 …

Architecture of the crust and uppermost mantle in the northern Canadian Cordillera from receiver functions

The northern Canadian Cordillera (NCC) is an active orogenic belt in northwestern Canada characterized by deformed autochtonous and …

Seismic velocity model of the crust in the northern Canadian Cordillera from Rayleigh wave dispersion data

Models of the seismic velocity structure of the crust in the seismically active northern Canadian Cordillera remain poorly constrained, …

Control of lithospheric inheritance on neotectonic activity in northwestern Canada?

Lithospheric inheritance is thought to affect the location and reactivation of tectonic structures through successive cycles of …