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@article{Leah:2022:10.1130/G50272.1,
author = {Leah, H and Fagereng, A and Bastow, I and Bell, R and Lane, V and Henrys, S and Jacobs, K and Fry, B},
doi = {10.1130/G50272.1},
journal = {Geology},
pages = {1256--1260},
title = {The northern Hikurangi margin three-dimensional plate interface in New Zealand remains rough 100 km from the trench},
url = {http://dx.doi.org/10.1130/G50272.1},
volume = {50},
year = {2022}
}

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TY  - JOUR
AB  - At the northern Hikurangi margin (North Island, New Zealand), shallow slow slip events (SSEs) frequently accommodate subduction-interface plate motion from landward of the trench to <20 km depth. SSEs may be spatially related to geometrical interface heterogeneity, though kilometer-scale plate-interface roughness imaged by active-source seismic methods is only constrained offshore at <12 km depth. Onshore constraints are comparatively lacking, but we mapped the Hikurangi margin plate interface using receiver functions from data collected by a dense 22 × 10 km array of 49 broadband seismometers. The plate interface manifests as a positive-amplitude conversion (velocity increase with depth) dipping west from 10 to 17 km depth. This interface corroborates relocated earthquake hypocenters, seismic velocity models, and downdip extrapolation of depth-converted two-dimensional active-source lines. Our mapped plate interface has kilometer-amplitude roughness we interpret as oceanic volcanics or seamounts, and is 1–4 km shallower than the regional-scale plate-interface model used in geodetic inversions. Slip during SSEs may thus have different magnitudes and/or distributions than previously thought. We show interface roughness also leads to shear-strength variability, where slip may nucleate in locally weak areas and propagate across areas of low shear-strength gradient. Heterogeneous shear strength throughout the depth range of the northern Hikurangi margin may govern the nature of plate deformation, including the localization of both slow slip and hazardous earthquakes.
AU  - Leah,H
AU  - Fagereng,A
AU  - Bastow,I
AU  - Bell,R
AU  - Lane,V
AU  - Henrys,S
AU  - Jacobs,K
AU  - Fry,B
DO  - 10.1130/G50272.1
EP  - 1260
PY  - 2022///
SN  - 0091-7613
SP  - 1256
TI  - The northern Hikurangi margin three-dimensional plate interface in New Zealand remains rough 100 km from the trench
T2  - Geology
UR  - http://dx.doi.org/10.1130/G50272.1
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000855163300001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://pubs.geoscienceworld.org/gsa/geology/article/50/11/1256/616548/The-northern-Hikurangi-margin-three-dimensional
UR  - http://hdl.handle.net/10044/1/98069
VL  - 50
ER  -

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