Hikurangi megathrust slip behavior influenced by lateral variability in sediment subduction

Andrew C. Gase; Nathan L. Bangs; Harm J.A. Van Avendonk; Dan Bassett; Stuart A. Henrys

doi:10.1130/G50261.1

Hikurangi megathrust slip behavior influenced by lateral variability in sediment subduction

Andrew C. Gase, Nathan L. Bangs, Harm J.A. Van Avendonk, Dan Bassett, Stuart A. Henrys

Geosciences Department

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Subduction megathrusts exhibit a range of slip behaviors spanning from large earthquakes to aseismic creep, yet what controls spatial variations in the dominant slip mechanism remains unresolved. We present multichannel seismic images that reveal a correlation between the lithologic homogeneity of the megathrust and its slip behavior at a subduction zone that is world renowned for its lateral slip behavior transition, the Hikurangi margin. Where the megathrust exhibits shallow slow-slip in the central Hikurangi margin, the protolith of the megathrust changes ∼10 km downdip of the deformation front, transitioning from pelagic carbonates to compositionally heterogeneous volcaniclastics. At the locked southern Hikurangi segment, the megathrust forms consistently within pelagic carbonates above thickened nonvolcanic siliciclastic sediments (unit MES), which subduct beyond 75 km horizontally.

Original language	English
Pages (from-to)	1145-1149
Number of pages	5
Journal	Geology
Volume	50
Issue number	10
DOIs	https://doi.org/10.1130/G50261.1
State	Published - Oct 2022

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title = "Hikurangi megathrust slip behavior influenced by lateral variability in sediment subduction",

abstract = "Subduction megathrusts exhibit a range of slip behaviors spanning from large earthquakes to aseismic creep, yet what controls spatial variations in the dominant slip mechanism remains unresolved. We present multichannel seismic images that reveal a correlation between the lithologic homogeneity of the megathrust and its slip behavior at a subduction zone that is world renowned for its lateral slip behavior transition, the Hikurangi margin. Where the megathrust exhibits shallow slow-slip in the central Hikurangi margin, the protolith of the megathrust changes ∼10 km downdip of the deformation front, transitioning from pelagic carbonates to compositionally heterogeneous volcaniclastics. At the locked southern Hikurangi segment, the megathrust forms consistently within pelagic carbonates above thickened nonvolcanic siliciclastic sediments (unit MES), which subduct beyond 75 km horizontally.",

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T1 - Hikurangi megathrust slip behavior influenced by lateral variability in sediment subduction

AU - Gase, Andrew C.

AU - Bangs, Nathan L.

AU - Van Avendonk, Harm J.A.

AU - Bassett, Dan

AU - Henrys, Stuart A.

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AB - Subduction megathrusts exhibit a range of slip behaviors spanning from large earthquakes to aseismic creep, yet what controls spatial variations in the dominant slip mechanism remains unresolved. We present multichannel seismic images that reveal a correlation between the lithologic homogeneity of the megathrust and its slip behavior at a subduction zone that is world renowned for its lateral slip behavior transition, the Hikurangi margin. Where the megathrust exhibits shallow slow-slip in the central Hikurangi margin, the protolith of the megathrust changes ∼10 km downdip of the deformation front, transitioning from pelagic carbonates to compositionally heterogeneous volcaniclastics. At the locked southern Hikurangi segment, the megathrust forms consistently within pelagic carbonates above thickened nonvolcanic siliciclastic sediments (unit MES), which subduct beyond 75 km horizontally.

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Hikurangi megathrust slip behavior influenced by lateral variability in sediment subduction

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