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- W3158826848 abstract "Shear-wave splitting observations can provide insight into mantle flow, due to the link between the deformation of mantle rocks and their direction-dependent seismic wave velocities. We identify anisotropy in the Cook Inlet segment of the Alaska subduction zone by analyzing splitting parameters of S waves from local intraslab earthquakes between 50 and 200 km depths, recorded from 2015–2017 and emphasizing stations from the Southern Alaska Lithosphere and Mantle Observation Network experiment. We classify 678 high-quality local shear-wave splitting observations into four regions, from northwest to southeast: (L1b) splitting measurements parallel to Pacific plate motion, (L1a) arc-perpendicular splitting pattern, (L2) sharp transition to arc-parallel splitting, and (L3) splitting parallel to Pacific plate motion. Forward modeling of splitting from various mantle fabrics shows that no one simple model fully explains the observed splitting patterns. An A-type olivine fabric with fast direction dipping 45° to the northwest (300°)—aligned with the dipping slab—predicts fast directions that fit L1a observations well, but not L2. The inability of the forward model fabrics to fit all the observed splitting patterns suggests that the anisotropy variations are not due to variable ray angles, but require distinct differences in the anisotropy regime below the arc, forearc, and subducting plate." @default.
- W3158826848 created "2021-05-10" @default.
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- W3158826848 date "2021-05-01" @default.
- W3158826848 modified "2023-10-14" @default.
- W3158826848 title "Anisotropy Variations in the Alaska Subduction Zone Based on Shear‐Wave Splitting From Intraslab Earthquakes" @default.
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- W3158826848 doi "https://doi.org/10.1029/2020gc009558" @default.
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