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• W2770036597 abstract "Abstract The 410 and 660 km discontinuities ( d 410 and d 660, respectively) beneath Alaska and adjacent areas are imaged by stacking 75,296 radial receiver functions recorded by 438 broadband seismic stations with up to 30 years of recording period. When the 1‐D IASP91 Earth model is used for moveout correction and time depth conversion, significant and spatially systematic variations in the apparent depths of the d 410 and d 660 are observed. The mean apparent depth of the d 410 and d 660 for the entire study area is 417 ± 12 km and 665 ± 12 km, respectively, and the mean mantle transition zone (MTZ) thickness is 248 ± 8 km which is statistically identical to the global average. For most of the areas, the undulations of the apparent depths of the d 410 and d 660 are highly correlated, indicating that lateral velocity variations in the upper mantle above the d 410 contribute to the bulk of the observed apparent depth variations by affecting the traveltimes of the P ‐to‐ S converted phases from both discontinuities. Beneath central Alaska, a broad zone with greater than normal MTZ thicknesses and shallower than normal d 410 is imaged, implying that the subducting Pacific slab has reached the MTZ and is fragmented or significantly thickened. Within the proposed Northern Cordilleran slab window, an overall thinner than normal MTZ is observed and is most likely the result of a depressed d 410. This observation, when combined with results from seismic tomography investigations, may indicate advective thermal upwelling from the upper MTZ through the slab window." @default.
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• W2770036597 date "2017-12-01" @default.
• W2770036597 modified "2023-10-16" @default.
• W2770036597 title "Topography of the Mantle Transition Zone Discontinuities Beneath Alaska and Its Geodynamic Implications: Constraints From Receiver Function Stacking" @default.
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• W2770036597 doi "https://doi.org/10.1002/2017jb014604" @default.
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