Modeled continuous velocity field Modeled strain rate magnitudes Surface Deformation of Alaska • Evidence for a rigid Bering plate • Extension in northwestern Alaska and eastern Russia • Extrusion toward northwestern Canada • Deformation propagates far inboard from the plate margin 500 km inzel et al. (2011) Yellow vectors from PBO and others Red vectors, continuous model velocity field Area of inferred Yakutat flat slab subduction
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Modeled continuous velocity fieldModeled strain rate magnitudes Surface Deformation of Alaska Evidence for a rigid Bering plate Extension in northwestern.
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Modeled continuous velocity field Modeled strain rate magnitudes
Surface Deformation of Alaska
• Evidence for a rigid Bering plate• Extension in northwestern Alaska and eastern Russia• Extrusion toward northwestern Canada• Deformation propagates far inboard from the plate
margin
500 km
Finzel et al. (2011)
Yellow vectors from PBO and othersRed vectors, continuous model velocity field
Area of inferred Yakutat flat slab
subduction
A New Deformation Model for Alaska and Western Canada
New perspective on Alaska
Finzel et al. (2011)
Old Alaskan paradigm
500 km
Yakutatmicroplate
• Highly deforming regions • Abundant seismicity, high gradients in the modeled velocity field, high strain rate magnitudes
• Relatively rigid regions• Sparse seismicity, very small gradients in the modeled velocity field, low strain rate
magnitudes
Contributions to our understanding of the Alaskan convergent margin
• A new kinematic model for Alaska and western Canada, including the location and nature of the present day plate boundaries in the region that includes:• Evidence for a rigid Bering plate• Extension in northwestern Alaska and eastern Russia• Extrusion toward northwestern Canada• Deformation propagates far inboard from the plate margin