Neotectonics seismicity in the south-eastern Beaufort Sea polar continental margin of north-western Canadaстатья
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Аннотация:A two!dimensional numerical model is presented that links inferences about recent rates of onshore uplift
in the area of the Mackenzie Delta to rapid subsidence of the o}shore BeaufortMackenzie Basin and the
present!day upper lithospheric structure across the continent!ocean transition in this region of north!western
Canada[ The model results comprise a self!consistent set of internal displacements "velocities# and boundary
conditions which predict a concentration of shear stress in the oceanic crust "and overlying sedimentary
basin# in a region of the south!eastern Beaufort Sea featuring a concentration of earthquake epicentres[ The
mode of faulting implied by the calculated stress tensors is normal\ consistent with a published fault!plane
solution and in!situ stress measurements suggesting the axis of maximum compression to be perpendicular to
the model cross!section[ The results indicate that the uplift:subsidence pattern and seismicity are tectonically
related but do not support models invoking tectonic compression\ which have been previously proposed
here and on other seismically active continental margins with rapidly subsiding sedimentary basins[ Rather\
a key role for dynamic processes in the upper mantle "including the asthenosphere#\ related to the continent!
ocean lithosphere transition at passive continental margins\ is implied[ 0887 Elsevier Science Ltd[ All
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