Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New Zealand
Abstract We use a prestack depth migration reflection image and magnetic anomaly data across the northern Hikurangi subduction zone, New Zealand, to constrain plate boundary structure and geometry of a subducting seamount in a region of shallow slow slip and recent International Ocean Discovery Prog...
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| Format: | Article |
| Language: | English |
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Wiley
2018-12-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2018GL080259 |
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| author | Daniel H. N. Barker Stuart Henrys Fabio Caratori Tontini Philip M. Barnes Dan Bassett Erin Todd Laura Wallace |
| author_facet | Daniel H. N. Barker Stuart Henrys Fabio Caratori Tontini Philip M. Barnes Dan Bassett Erin Todd Laura Wallace |
| author_sort | Daniel H. N. Barker |
| collection | DOAJ |
| description | Abstract We use a prestack depth migration reflection image and magnetic anomaly data across the northern Hikurangi subduction zone, New Zealand, to constrain plate boundary structure and geometry of a subducting seamount in a region of shallow slow slip and recent International Ocean Discovery Program drilling. Our 3‐D model reveals the subducting seamount as a SW‐NE striking, lozenge‐shaped ridge approximately 40 km long and 15 km wide, with relief up to 2.5 km. This seamount broadly correlates with a 20‐km‐wide gap separating two patches of large (>10 cm) slow slip and the locus of tectonic tremor associated with the September–October 2014 Gisborne slow slip event. Largest slow slip magnitudes occurred where the décollement is underlain by a 3.0‐km‐thick zone of highly reflective subducting sediments. Wave speeds within this zone are 7% lower than adjacent and overlying strata, supporting the view that high fluid pressures within subducting sediments may facilitate shallow slow slip along the north Hikurangi margin. |
| format | Article |
| id | doaj-art-9e8cfcd6554447f8bca23b81c03e3269 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2018-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-9e8cfcd6554447f8bca23b81c03e32692025-08-20T01:51:44ZengWileyGeophysical Research Letters0094-82761944-80072018-12-01452312,80412,81310.1029/2018GL080259Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New ZealandDaniel H. N. Barker0Stuart Henrys1Fabio Caratori Tontini2Philip M. Barnes3Dan Bassett4Erin Todd5Laura Wallace6GNS Science Lower Hutt New ZealandGNS Science Lower Hutt New ZealandGNS Science Lower Hutt New ZealandNational Institute of Water and Atmospheric Research Wellington New ZealandGNS Science Lower Hutt New ZealandDepartment of Geology University of Otago Dunedin New ZealandGNS Science Lower Hutt New ZealandAbstract We use a prestack depth migration reflection image and magnetic anomaly data across the northern Hikurangi subduction zone, New Zealand, to constrain plate boundary structure and geometry of a subducting seamount in a region of shallow slow slip and recent International Ocean Discovery Program drilling. Our 3‐D model reveals the subducting seamount as a SW‐NE striking, lozenge‐shaped ridge approximately 40 km long and 15 km wide, with relief up to 2.5 km. This seamount broadly correlates with a 20‐km‐wide gap separating two patches of large (>10 cm) slow slip and the locus of tectonic tremor associated with the September–October 2014 Gisborne slow slip event. Largest slow slip magnitudes occurred where the décollement is underlain by a 3.0‐km‐thick zone of highly reflective subducting sediments. Wave speeds within this zone are 7% lower than adjacent and overlying strata, supporting the view that high fluid pressures within subducting sediments may facilitate shallow slow slip along the north Hikurangi margin.https://doi.org/10.1029/2018GL080259Hikurangi marginseamountseismic reflectionsubducting slabfault slip behaviorslow slip |
| spellingShingle | Daniel H. N. Barker Stuart Henrys Fabio Caratori Tontini Philip M. Barnes Dan Bassett Erin Todd Laura Wallace Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New Zealand Geophysical Research Letters Hikurangi margin seamount seismic reflection subducting slab fault slip behavior slow slip |
| title | Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New Zealand |
| title_full | Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New Zealand |
| title_fullStr | Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New Zealand |
| title_full_unstemmed | Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New Zealand |
| title_short | Geophysical Constraints on the Relationship Between Seamount Subduction, Slow Slip, and Tremor at the North Hikurangi Subduction Zone, New Zealand |
| title_sort | geophysical constraints on the relationship between seamount subduction slow slip and tremor at the north hikurangi subduction zone new zealand |
| topic | Hikurangi margin seamount seismic reflection subducting slab fault slip behavior slow slip |
| url | https://doi.org/10.1029/2018GL080259 |
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