Computer simulations of Alaskan neotectonics

Article Abstract:

Thin-plate finite-element methods simulate the deformation and fault slip in the Alaskan/Bering Sea region. The methods consider the anelastic strain rate, stress and velocity fields. They produce simulations for systematic changes in shear traction on the megathrust, fault friction within North America, internal friction of lithospheric blocks, and mantle creep strength. The most suitable model for the simulation has low-stress and shows that the present deformation is a temporary response to the Plio-Pleistocene glacial mass redistribution.

Usage, Finite element method, Neotectonics

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Kinematic history of the Laramide orogeny in latitudes 35 degrees - 49 degrees N, western United States

Article Abstract:

It has been possible to use a new algorithm to compute the kinematics of the Rocky Mountain foreland and adjacent areas back to 85 Ma. This method produces estimated histories of the slip on each fault and the drift and rotation of each paleomagnetic site. It has also been possible to estimate velocity field through time for the entire region. During the Laramide orogeny in the foreland, the mean shortening azimuth was steady at 40 degrees until 50 Ma and then rotated clockwise to 55 degrees. There was no counterclockwise stress rotation.

Faults (Geology), Rocky Mountains

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Opposing gradients of permanent strain in the aseismic zone and elastic strain across the seismogenic zone of the Kodiak shelf and slope, Alaska

Article Abstract:

Permanent strain over the marine area of the Kodiak margin, Alaska was estimated from a seismic image. Tectonic shortening was estimated and the transect was divided into segments to estimate the duration of deformation. The long-term permanent strain pattern was compared to a coseismic slip model from the 1964 Alaska earthquake. A qualitative tectonic and geologic model provides an explanation for weak contractile deformation in spite of strong compressional coseismic strain release over the northern Kodiak shelf.

Observations, Geology, Structural, Structural geology, Seismological research

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