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68 results for “Hikurangi margin”
Fig. 4 in Echinoderes (Kinorhyncha: Cyclorhagida) from the Hikurangi Margin, New Zealand
Fig. 4. Scanning electron micrographs showing overviews and details of Echinoderes blazeji sp. nov. A. Dorsolateral overview of female. B. Segments 1 to 4, dorsolateral view. C. Segments 1 to 3, ventral view. D. Lateral overview of male. E. Segments 4 to 6, dorsal view. F. Segments 5 to 7, ventral view. G. Segments 8 to 11 of female, laterodorsal view. H. Segments 7 to 8, lateral view. I. Segments 10 to 11 of male, dorsal view. J. Segments 10 to 11 of male, dorsolateral view. K. Segments 10 to 11 of female, lateral view, with close-up of segment 11 ventral side showing ventrolateral tubules. Abbreviations: see Material and methods.
Fig. 1 in Echinoderes (Kinorhyncha: Cyclorhagida) from the Hikurangi Margin, New Zealand
Fig. 1. Map showing the sampling stations. Colour codes indicate slopes (red), canyons (green), and seamounts (yellow). Inset shows New Zealand with a frame marking the sampling area.
Fig. 5 in Echinoderes (Kinorhyncha: Cyclorhagida) from the Hikurangi Margin, New Zealand
Fig. 5. Line art illustrations of Echinoderes landersi sp. nov. A. ♀, dorsal view. B. ♀, ventral view. Abbreviations: see Material and methods.
Fig. 3 in Echinoderes (Kinorhyncha: Cyclorhagida) from the Hikurangi Margin, New Zealand
Fig. 3. Light micrographs showing overviews and details of Echinoderes blazeji sp. nov. A, G–H. ♂, paratype (NIWA-159401). B–C, E–F. ♂, holotype (NIWA-159400). D, I. ♀, paratype (NHMD-917223). A. Lateral overview of male. B. Segments 1 to 5, dorsal view. C. Segments 1 to 5, ventral view. D. Lateral overview of female. E. Segments 6 to 9, dorsal view. F. Segments 7 to 11, ventral view. G. Segments 8 to 9, lateroventral view. H. Segments 9 to 11 of male, lateral view. I. Segments 9 to 11 of female, lateral view. Abbreviations: see Material and methods.
Fig. 5. Modern vesicomyids from the Hikurangi Margin. A, D in Fossil vesicomyid bivalves from Miocene hydrocarbon seep sites, North Island, New Zealand
Fig. 5. Modern vesicomyids from the Hikurangi Margin. A, D. Calyptogena sp. A. UOA L4610; right valve external (A 1) and internal (A 2) views. D. UOA L4611; external views of right (D 1) and left (D 2) valves. B, C. Archivesica sp. B. UOA L4608; left valve hinge. C. UOA L4609; left valve external (C 1) and internal (C 2) views.
Fig. 9 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 9. Aulostomonema abyssum gen. et sp. nov. Composite light micrograph image of entire male, paratype (NIWA154912). Scale bar = 1000 µm.
Fig. 12 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 12. Deraionema barbatum gen. et sp. nov. Light micrographs. A –B, E–F. Paratype (NIWA154915). C –D. Holotype (NIWA154917). A. Male cephalic region showing lips, buccal cavity, pharynx and subcephalic setae. B. Male cephalic region showing amphideal aperture. C. Female cephalic region showing lips, buccal cavity and pharynx. D. Female cephalic region showing amphideal aperture and subcephalic setae. E–F. Copulatory apparatus. Abbreviations: aa = amphideal aperture; gu = gubernaculum; n = amphideal nerve; sp = spicule. Scale bar = 20 µm.
Fig. 6 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 6. Linhomoeus pycnocricus sp. nov. Light micrographs of male, paratype (NIWA154907). A. Cephalic region showing amphid. B. Cephalic region showing cephalic sensilla. C. Cephalic region showing subcephalic sensilla. D. Cephalic region showing buccal cavity and pharynx. E. Intestine. Scale bar: A–D = 20 µm; E = 15 µm.
Fig. 11 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 11. Deraionema barbatum gen. et sp. nov. A. Entire male, holotype (NIWA154914). B. Entire female, paratype (NIWA154917). Scale bar = 250 µm.
Fig. 3 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 3. Siphonolaimus curtisensillus sp. nov. Light micrographs. A–B, F. Holotype (NIWA154903). C. Paratype (NIWA154905). D–E, G. Paratype (NIWA154904). A. Male cephalic region showing pharynx and stylet. B. Male cephalic region showing amphid. C. Female anterior body region. D–E. Male intestine. F. Copulatory apparatus. G. Vulva and proximal portion of female genital branch. Scale bar: A–B = 20 µm; C–F = 10 µm; G = 15 µm.
Fig. 14 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 14. Aegialoalaimus magnus sp. nov.A. Entire male, holotype (NIWA154918).B. Female reproductive system, paratype (NIWA154920). Scale bar: A = 300 µm; B = 175 µm.
Fig. 17 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 17. Desmodora parapilosa sp. nov. Light micrographs, paratype (NIWA154923). A–B. Female cephalic region showing cuticle, amphid, and cephalic sensilla. C–D. Female cephalic region showing buccal cavity. Scale bar = 20 µm.
Fig. 13 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 13. Aegialoalaimus magnus sp. nov. A–B, D. Paratype (NIWA154920). C, E–F. Holotype (NIWA 154918). A–B. Female anterior body region. C. Male cephalic region. D. Female posterior body region. E. Male copulatory apparatus. F. Male posterior body region. Scale bar: A–B = 100 µm; C = 60 µm; D–E = 50 µm; F = 125 µm.
Fig. 2 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 2. Siphonolaimus curtisensillus sp. nov. A. Entire male, holotype (NIWA154903). B. Entire female, paratype (NIWA154904). Scale bar = 400 µm.
Fig. 5 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 5. Linhomoeus pycnocricus sp. nov. A. Entire female, paratype (NIWA154909). B. Entire male, paratype (NIWA154907). C. Female reproductive system, paratype (NIWA154910). Scale bar: A–B = 500 µm; C = 275 µm.
Fig. 1 in New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand
Fig. 1. Siphonolaimus curtisensillus sp. nov. A, C. Holotype (NIWA154903). B, D, Paratype (NIWA 154904). E. Paratype (NIWA154905). A. Male anterior body region. B. Female anterior body region. C. Male posterior body region. D. Female posterior body region. E. Male posterior body region. Scale bar: A–B = 75 µm; C = 70 µm; D = 85 µm; E = 125 µm.
Low-fold seismic reflection data acquired across the Northern Hikurangi subduction margin and incoming Hikurangi Plateau, New Zealand
<p>Two-dimensional seismic reflection data were acquired on two surveys of the Northern Hikurangi subduction margin, New Zealand in 2011 and 2015. The survey data were collected to support research of tectonic structure, slow slip processes, stratigraphic architecture, and thermal state of the subduction margin and incoming plate, as well as to support ocean-floor drilling associated with IODP Expeditions 372 and 375. The surveys include (1) R/V <em>Tangaroa</em> NIWA voyage TAN1114 undertaken in 2011 by the National Institute of Water and Atmospheric Research (NIWA) and GNS Science, as part of the <em>OS2020 Northern Hikurangi Margin Geohazards</em> survey; and (2) R/V <em>Rodger Revelle</em> cruise RR1508 undertaken in 2015 by Oregon State University as part of the <em>Subduction Thrust Investigation of New Zealand using Geothermics and Seismics (STINGS)</em> project (see Figure 1). TAN1114 voyage was funded by the New Zealand Government Oceans 2020 Programme, and core research programme funding by NIWA and GNS Science. Cruise RR1508 was funded by NSF grants OCE-1355878 and OCE-1355870.</p> <p> </p> <p><strong>R/V <em>Tangaroa</em> TAN1114 Seismic Data</strong></p> <p><strong>Data Acquisition:</strong> The seismic system used on R/V <em>Tangaroa</em> during the 2011 National Institute of Water and Atmospheric Research (NIWA) survey TAN1114 included a source comprising two Sodera 45/105 GI guns operated in true GI mode. The guns were deployed 35 m behind the vessel RV <em>Tangaroa</em> at 5 m water depth. Lines TAN1114-01 to -13, and part of line 14 were acquired with a shot interval of 10.8 seconds (~25 m sailing at 4.5 knots), providing a nominal coverage of 12-fold data. Part of line TAN1114-14 and lines 15-23 were acquired with a shot interval of 21.6 seconds (~50 m sailing at 4.5 knots), providing a nominal 6-fold coverage. Data were recorded on a Geometrics GeoEel 48-channel seismic streamer with 6 X 100 m active sections, and a group interval of 12.5 m. The streamer was deployed at a depth of 7.5 m, apart from line TAN1114-01 where it was towed at 5 m depth. Depth control was maintained with a CSMX depth control system including three DigiCourse 5011 compass birds. The record length was 8 s and the sample rate 2 ms. Differential GPS was used for positioning. Table 1 summarises TAN1114 recording parameters and Table 2 lists TAN1114 lines acquired and processed. TAN1114 line coordinates are detailed in Table 3.</p> <p><strong>Data Processing:</strong> A total of 29 seismic lines were processed providing 1350 km of multichannel seismic reflection data. The lines were processed to post-stack time-migrated SEGY sections, using GNS Science GLOBE CLARITAS. With allowance for overlap of line segments the data were grouped into 51167 shot-point locations. Raw data were written to disk as IBM standard SEG-Y files. IBM Claritas Extended SEG-Y data were written to disk after geometry was added, after stack, and after migration. Shots were CDP sorted from disk during the stacking process to avoid creating large and unnecessary separate CDP sorted files. </p> <p>Post-stack migration (finite difference migration) has been applied to the stacked sections to produce a dip-true image, this results in clearer resolution of structural features such as faults and folds, and of detailed sedimentary features such as on-lapping and truncated reflections. Sea-floor multiple reflections disturb structural imaging especially in water depths less than 500 m. All seismic data are written to disk as processed sections in SEG-Y format. Line TAN1114-A is a composite splice including parts of lines TAN1114-4A, -6A and 7A. Details of the TAN1114 processing parameters are given in Table 4 and SEG-Y trace headers in Table 5.</p> <p> </p> <p><strong>R/V <em>Rodger Revelle</em> RR1508 Seismic Data</strong></p> <p><strong>Data Acquisition:</strong> The 2015 R/V <em>Rodger Revelle</em> survey RR1508 used a seismic system operated by Scripps Institute of Oceanography. Of two sub-regions surveyed during this cruise, only data from the northern Hikurangi margin are presented here. The seismic system used was similar to that on <em>Tangaroa</em> TAN1114, including a source comprising two Sodera 45/105 GI guns operated in true GI mode. The guns were deployed at a depth of 3.5 m and the shot spacing was 25 m. Data were recorded on a Geometrics GeoEel 48-channel seismic streamer with 6 X 100 m active sections, and a group interval of 12.5 m. The streamer was deployed at a depth of 3.5 m. During acquisition of the HKS01 lines, only the nearest 40 data channels were recorded. The record length was 8 s and the sample rate 1 ms. Differential GPS was used for positioning. Table 6 summarises RR1508 recording parameters and Table 7 lists RR1508 lines acquired and processed.</p> <p><strong>Data Processing: </strong>A total of 13 HKS01 seismic lines were processed to post-stack time-migrated SEGY sections, using GNS Science GLOBE CLARITAS. Data processing included application of geometry, sorting, trace editing, normal moveout correction, stack, filtering and finite difference migration. All seismic data are written to disk as processed sections in SEG-Y format. Details of the RR1508 processing parameters are given in Table 8 and SEG-Y trace headers in Table 9.</p> <p> </p> <p><strong>List of files</strong></p> <p>Figure 1. TAN1114 and RR1508 seismic line locations on the northern Hikurangi margin.</p> <p>Table 1. Summary of TAN1114 recording parameters.</p> <p>Table 2. Summary of TAN1114 lines acquired and processed.</p> <p>Table 3. Summary of TAN1114 line coordinates.</p> <p>Table 4. Summary of TAN1114 seismic processing sequence.</p> <p>Table 5. Summary of TAN1114 SEG-Y trace headers.</p> <p>Table 6. Summary of RR1508 recording parameters.</p> <p>Table 7. Summary of RR1508 lines acquired and processed.</p> <p>Table 8. Summary of RR1508 seismic processing sequence.</p> <p>Table 9. Summary of RR1508 SEG-Y trace headers.</p> <p> </p> <p>Processed SEGY seismic data</p> <p>TAN1114-01.sgy</p> <p>TAN1114-02.sgy</p> <p>TAN1114-03.sgy</p> <p>TAN1114-04.sgy</p> <p>TAN1114-04A.sgy</p> <p>TAN1114-05.sgy</p> <p>TAN1114-06.sgy</p> <p>TAN1114-06A.sgy</p> <p>TAN1114-07.sgy</p> <p>TAN1114-07A.sgy</p> <p>TAN1114-08.sgy</p> <p>TAN1114-09.sgy</p> <p>TAN1114-10.sgy</p> <p>TAN1114-10B.sgy</p> <p>TAN1114-11.sgy</p> <p>TAN1114-12.sgy</p> <p>TAN1114-12T.sgy</p> <p>TAN1114-13.sgy</p> <p>TAN1114-14.sgy</p> <p>TAN1114-15.sgy</p> <p>TAN1114-16.sgy</p> <p>TAN1114-17.sgy</p> <p>TAN1114-18.sgy</p> <p>TAN1114-19.sgy</p> <p>TAN1114-20.sgy</p> <p>TAN1114-21.sgy</p> <p>TAN1114-22.sgy</p> <p>TAN1114-23.sgy</p> <p>TAN1114-A.sgy</p> <p>RR1508-HKS01_01.sgy</p> <p>RR1508-HKS01_02.sgy</p> <p>RR1508-HKS01_02A.sgy</p> <p>RR1508-HKS01_03.sgy</p> <p>RR1508-HKS01_04.sgy</p> <p>RR1508-HKS01_05.sgy</p> <p>RR1508-HKS01_05A.sgy</p> <p>RR1508-HKS01_06.sgy</p> <p>RR1508-HKS01_07.sgy</p> <p>RR1508-HKS01_08.sgy</p> <p>RR1508-HKS01_09.sgy</p> <p>RR1508-HKS01_09A.sgy</p> <p>RR1508-HKS01_10.sgy</p>
SWS and Vp/Vs results - HOBITSS, 2014-2015, Hikurangi margin, New Zealand -
<p>We include here the shear wave splitting and Vp/Vs results used in "Temporal and spatial variations in seismic anisotropy and Vp/Vs ratios in a region of slow slip" as part of the Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip” (HOBITSS) experiment. This catalog is part of a paper submitted to EPSL in September 2019. A description of the column headers can be found in the MFAST manual, in table 4, at: <a href="http://mfast-package.geo.vuw.ac.nz/mfast_manual_v2.2.pdf">http://mfast-package.geo.vuw.ac.nz/mfast_manual_v2.2.pdf</a></p>
Dataset of automated earthquake detections in the Hikurangi Margin (New Zealand) during the 2014 Slow Slip Event
<p>The dataset provided in this repository contains:</p> <p>- Yarce_REST_events.dat: Contains information of 854 events, with event id, origin time (epoch time), latitude, longitude, depth, number of P arrivals, number of S arrivals, total number of arrivals, local magnitude.</p> <p>- Yarce_REST_arrivals.data: Contains the arrival data information of the 854 events in Yarce_REST_events_v2.csv: event id, station, phase (P or S), arrival time.</p>
Bathymetric elevation models of the Southern Hikurangi Subduction Margin, New Zealand
<p>Multibeam bathymetric data compiled by the National Institute of Water and Atmospheric Research (NIWA), New Zealand, are presented for the southern Hikurangi Subduction Margin, New Zealand. These datasets cover the eastern continental slope of southern Wairarapa, North Island, and Marlborough, South Island, the adjacent northwestern slope of the Chatham Rise, and the southern Hikurangi Trough. The data were collected for scientific research purposes, primarily for the study of continental margin active tectonics and sedimentary systems associated with NIWA SSIF Programme Marine Geological Processes (and its predecessors).</p><p>Prominent features of the data are:</p><ol><li>the numerous submarine canyons and gully systems that incise the continental slopes and deliver sediment from the shelf to the southern Hikurangi Trough. These include the Kaīkoura, Hurunui, Pegasus, Okains, and Pūkākī canyons of NE South Island, the Cook Strait Canyon and its numerous tributaries, and the Opouawe, Pahaua, Honeycomb, and Madden canyon systems of SE North Island;</li><li>Elongate bathymetric ridges along the Marlborough and Wairarapa continental slopes that result from seafloor uplift associated with tectonic thrust faults propagating beneath them;</li><li>The flat basin floor of the 2500-3000 m deep Hikurangi Trough, incised by the meandering Hikurangi Channel; and</li><li>Mernoo Bank on the crest of the Chatham Rise.</li></ol><p><strong>Bathymetric Data</strong></p><p>Two separate bathymetric data sets are provided, covering northern and southern regions. The northern dataset is presented at a 50 m grid resolution, and the southern at 25 m grid resolution. Both datasets are compilations of available multibeam bathymetric data collected on multiple voyages. Primarily, the bathymetric data was collected by NIWA on the RV <i>Tangaroa</i> using Kongsberg 30 kHz (EM300 and EM302) multibeam echo sounders, with some additional data collected by German and US vessels using 12 kHz multibeam echo sounders.</p><p><strong>List of data sets</strong></p><ol><li>32-bit float GeoTIFF grid of offshore Marlborough bathymetry, New Zealand, at 25 m cell size. (WGS 84 / Mercator 41 EPSG:3994 projection)</li><li>32-bit float GeoTIFF grid of offshore Wairarapa bathymetry, New Zealand, at 50 m cell size. (WGS 84 / UTM zone 60S EPSG:32760 projection)</li></ol>
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