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- W2794878008 abstract "To characterize the along-strike structural variations of the Juan de Fuca (JdF) Plate as it enters the Cascadia subduction zone, we present prestack time migrated multichannel seismic reflection images of the JdF Plate along a 400-km-long trench-parallel transect extending from 44.3°N to 47.8°N. Beneath the 1.8–3.0-km-thick sediment cover, our data reveal basement topographic anomalies associated with a 1.2-km-high seamount and in the vicinity of propagator wakes (390–540-m relief). Weak Moho reflections are imaged beneath the propagator wakes and coincide with reduced Vp in the lower crust and/or uppermost mantle. The inferred locations of propagator wakes in the downgoing plate collocate with some of the boundaries of episodic tremor and slip events. We propose that the structural and hydration heterogeneities associated with these features could lead to anomalous plate interface properties and contribute to episodic tremor and slip segmentation. Intracrustal reflections with apparent dips (20°–30°) consistent with subduction bending normal faults change near 45.8°N, from northward dipping reflections confined to the middle crust in the north to antithetic reflections through the crust in the south, coinciding with a Vp reduction in the lower crust. These observations indicate more extensive faulting deformation and associated hydration of the JdF Plate south of 45.8°N, which likely results from variations of slab dip and resistance to subduction across 46°N. Basement offsets and abrupt depth/amplitude changes in Moho reflections are imaged beneath the four major WNW trending strike-slip faults that cross the Cascadia deformation front, providing strong evidence of a lower plate origin for these faults." @default.
- W2794878008 created "2018-04-06" @default.
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- W2794878008 date "2018-04-01" @default.
- W2794878008 modified "2023-10-16" @default.
- W2794878008 title "Along‐Trench Structural Variations of the Subducting Juan de Fuca Plate From Multichannel Seismic Reflection Imaging" @default.
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- W2794878008 doi "https://doi.org/10.1002/2017jb015059" @default.
- W2794878008 hasPublicationYear "2018" @default.
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