Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow
Source: doi:10.1002/2016GC006563 Prestack depth migration data across the Hikurangi margin, East Coast of the North Island, New Zealand, are used to derive subducting slab geometry, upper crustal structure, and seismic velocities resolved to ∼14 km depth. We investigate the potential relationship be...
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ftunivtroemsoe:oai:munin.uit.no:10037/10585 2023-05-15T14:27:11+02:00 Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow Plaza-Faverola, Andreia Henrys, Stuart Pecher, Ingo Wallace, L. Klaeschen, Dirk 2016-12-25 https://hdl.handle.net/10037/10585 https://doi.org/10.1002/2016GC006563 eng eng American Geophysical Union Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Plaza-Faverola, A., S. Henrys, I. Pecher, L. Wallace, and D. Klaeschen (2016), Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow, Geochem. Geophys. Geosyst., 17, 5009–5023, doi:10.1002/2016GC006563. FRIDAID 1423972 doi:10.1002/2016GC006563 1525-2027 https://hdl.handle.net/10037/10585 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2016 ftunivtroemsoe https://doi.org/10.1002/2016GC006563 2021-06-25T17:55:08Z Source: doi:10.1002/2016GC006563 Prestack depth migration data across the Hikurangi margin, East Coast of the North Island, New Zealand, are used to derive subducting slab geometry, upper crustal structure, and seismic velocities resolved to ∼14 km depth. We investigate the potential relationship between the crustal architecture, fluid migration, and short-term geodetically determined slow slip events. The subduction interface is a shallow dipping thrust at <7 km depth near the trench and steps down to 14 km depth along an ∼18 km long ramp, beneath Porangahau Ridge. This apparent step in the décollement is associated with splay fault branching and coincides with a zone of maximum slip (90 mm) inferred on the subduction interface during slow slip events in June and July 2011. A low-velocity zone beneath the plate interface, updip of the plate interface ramp, is interpreted as fluid-rich overpressured sediments capped with a low permeability condensed layer of chalk and interbedded mudstones. Fluid-rich sediments have been imbricated by splay faults in a region that coincides with the step down in the décollement from the top of subducting sediments to the oceanic crust and contribute to spatial variation in frictional properties of the plate interface that may promote slow slip behavior in the region. Further, transient fluid migration along splay faults at Porangahau Ridge may signify stress changes during slow slip. Article in Journal/Newspaper Arctic University of Tromsø: Munin Open Research Archive New Zealand Geochemistry, Geophysics, Geosystems 17 12 5009 5023 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
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VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Plaza-Faverola, Andreia Henrys, Stuart Pecher, Ingo Wallace, L. Klaeschen, Dirk Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
Source: doi:10.1002/2016GC006563 Prestack depth migration data across the Hikurangi margin, East Coast of the North Island, New Zealand, are used to derive subducting slab geometry, upper crustal structure, and seismic velocities resolved to ∼14 km depth. We investigate the potential relationship between the crustal architecture, fluid migration, and short-term geodetically determined slow slip events. The subduction interface is a shallow dipping thrust at <7 km depth near the trench and steps down to 14 km depth along an ∼18 km long ramp, beneath Porangahau Ridge. This apparent step in the décollement is associated with splay fault branching and coincides with a zone of maximum slip (90 mm) inferred on the subduction interface during slow slip events in June and July 2011. A low-velocity zone beneath the plate interface, updip of the plate interface ramp, is interpreted as fluid-rich overpressured sediments capped with a low permeability condensed layer of chalk and interbedded mudstones. Fluid-rich sediments have been imbricated by splay faults in a region that coincides with the step down in the décollement from the top of subducting sediments to the oceanic crust and contribute to spatial variation in frictional properties of the plate interface that may promote slow slip behavior in the region. Further, transient fluid migration along splay faults at Porangahau Ridge may signify stress changes during slow slip. |
format |
Article in Journal/Newspaper |
author |
Plaza-Faverola, Andreia Henrys, Stuart Pecher, Ingo Wallace, L. Klaeschen, Dirk |
author_facet |
Plaza-Faverola, Andreia Henrys, Stuart Pecher, Ingo Wallace, L. Klaeschen, Dirk |
author_sort |
Plaza-Faverola, Andreia |
title |
Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow |
title_short |
Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow |
title_full |
Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow |
title_fullStr |
Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow |
title_full_unstemmed |
Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow |
title_sort |
splay fault branching from the hikurangi subduction shear zone: implications for slow slip and fluid flow |
publisher |
American Geophysical Union |
publishDate |
2016 |
url |
https://hdl.handle.net/10037/10585 https://doi.org/10.1002/2016GC006563 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Plaza-Faverola, A., S. Henrys, I. Pecher, L. Wallace, and D. Klaeschen (2016), Splay fault branching from the Hikurangi subduction shear zone: Implications for slow slip and fluid flow, Geochem. Geophys. Geosyst., 17, 5009–5023, doi:10.1002/2016GC006563. FRIDAID 1423972 doi:10.1002/2016GC006563 1525-2027 https://hdl.handle.net/10037/10585 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2016GC006563 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
17 |
container_issue |
12 |
container_start_page |
5009 |
op_container_end_page |
5023 |
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1766300814320599040 |