The Gulf of Alaska is a complex environment, where geologic processes have formed a variety of features including troughs, canyons, channels, gullies, and other structures. We measured feature shape characteristics to assess relationships between drainage morphology, glaciomarine, and fault processes. Principal component analysis of fifteen parameters guided geographically weighted
regression (GWR) using four proxy variables for ice sheets, faults, and
instability. The GWR coefficients provide estimates of the influence of each parameter locally and regionally. Our results, combined with interpretation of geophysical data provide insight into the combination of geologic processes operating on the shelf-slope. Ice sheet extent explains the most drainage shape variation regionally, but the distance from an instability zone was the strongest local correlation; the fault coefficient was largest near the Transition fault where deformation has resulted in variable seafloor topography and slope failure.
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