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Surface Deformation of Alaska

Surface Deformation of Alaska. Modeled continuous velocity field. Modeled strain rate magnitudes. Yellow vectors from PBO and others Red vectors, continuous model velocity field. Evidence for a rigid Bering plate Extension in northwestern Alaska and eastern Russia

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Surface Deformation of Alaska

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  1. Surface Deformation of Alaska Modeled continuous velocity field Modeled strain rate magnitudes Yellow vectors from PBO and others Red vectors, continuous model velocity field • 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 Area of inferred Yakutat flat slab subduction 500 km Finzel et al. (2011)

  2. A New Deformation Model for Alaska and Western Canada Old Alaskan paradigm New perspective on Alaska • 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 Yakutat microplate 500 km Finzel et al. (2011)

  3. 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 Finzel et al. 2011

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