Show simple item record

dc.contributor.authorHan, Shuoshuo  Concept link
dc.contributor.authorCarbotte, Suzanne M.  Concept link
dc.contributor.authorCanales, J. Pablo  Concept link
dc.contributor.authorNedimovic, Mladen R.  Concept link
dc.contributor.authorCarton, Helene  Concept link
dc.date.accessioned2018-06-29T15:45:06Z
dc.date.available2018-10-12T16:43:46Z
dc.date.issued2018-04-22
dc.identifier.citationJournal of Geophysical Research: Solid Earth 123 (2018): 3122-3146en_US
dc.identifier.urihttps://hdl.handle.net/1912/10430
dc.descriptionAuthor Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123 (2018): 3122-3146, doi:10.1002/2017JB015059.en_US
dc.description.abstractTo 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.en_US
dc.description.sponsorshipNSF Grant Numbers: OCE 1029411, 1029305en_US
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2017JB015059
dc.subjectCascadia subduction zoneen_US
dc.subjectJuan de Fuca Plateen_US
dc.subjectMultichannel seismic reflection imagingen_US
dc.subjectSubduction bending faultingen_US
dc.subjectPropagator wakesen_US
dc.subjectStrike-slip faultsen_US
dc.titleAlong-trench structural variations of the subducting Juan de Fuca Plate from multichannel seismic reflection imagingen_US
dc.typeArticleen_US
dc.description.embargo2018-09-30en_US
dc.identifier.doi10.1002/2017JB015059


Files in this item

Thumbnail
Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record