Authors / CoAuthors
Spinoccia, M.
Abstract
This dataset contains bathymetry products from the Lord Howe Rise 2D Seismic Survey undertaken by Geoscience Australia (GA) and the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) during the period from 17 March to 16 May 2016 onboard the RV Kairei (Survey KR1605). The Lord Howe Rise (LHR) is a submerged plateau that extends from southwest New Caledonia to the west of New Zealand. Much of the LHR lies within the Australian marine jurisdiction at water depths of 1000-3000m. The Commonwealth conducted a scientific seismic survey over the Lord Howe Rise in 2016 in collaboration with JAMSTEC. This collaboration contributes to a larger research proposal submitted to the International Ocean Discovery Program (IODP) that would provide the first deep stratigraphic record for the Cretaceous Eastern Gondwana Margin. The IODP proposal, if funded, is to drill a deep stratigraphic well to a depth of 2-3 km below the seabed, possibly in 2020. In order to select the drill sites, GA and JAMSTEC are conducting site assessments that involve a seismic survey in 2016 and a geotechnical survey in 2017. Multibeam bathymetry data were acquired during the survey covering an area of 62,360 km2. Eight bathymetry grids of 50 to 80m resolution were produced using the shipborne 12 KHz sonar system.
Product Type
dataset
eCat Id
112283
Contact for the resource
Author
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Resource provider
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Digital Object Identifier
Keywords
- Australian and New Zealand Standard Research Classification: Fields of Research
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- Earth Sciences
- ( {1} )
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- HVC_144641
- ( Project )
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- AusSeabed
- ( {1} )
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- Multibeam
- ( {1} )
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- Bathymetry
- ( {1} )
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- marine
- ( {1} )
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- coral sea
- ( {1} )
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- Published_External
Publication Date
2017-10-31T11:00:00
Creation Date
2017-10-27T10:00:00
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
The Lord Howe Rise (LHR) 2D Seismic Survey, GA-0354/ KR1605 was acquired by Geoscience Australia on board the RV Kairei from the 17 March to 16 May 2016. The chief scientist on board was Dr Shuichi Kodaira (JAMSTEC) and Dr Scott Nichol (GA). The bathymetry dataset was acquired by JAMSTEC on board the RV Kairei and processed in the office by Michele Spinoccia, using CARIS HIPS & SIPS ver. 7.1.2. 1. First a vessel configuration file was created where the co-ordinates of the motion sensor and DGPS antenna and patch test offsets were recorded. 2. A new project was then created and the vessel configuration file was attached to the project file. 3. The raw swath sonar data, in raw.all format, for each line was then imported into the project and the vessel information assigned to the data. 4. The motion sensor, DGPS and heading data were then cleaned using a filter that averaged adjacent data to remove artefacts. 5. Different sound velocity profiles data for each block were attached to the corresponding raw swath sonar data files to correct the depths for changes in the speed of sound through the water column. 6. Then a new blank field area was defined that specified the geographic area of study and the co-ordinate system used. The co-ordinates for the study areas were WGS84 UTM-56S, 57S and 48S. 7. The data was cleaned by applying several filters that removed any remaining spikes in the bathymetry data using user defined threshold values. A visual inspection of the data for each line was then undertaken where artefacts and noisy data not removed by the filtering process were removed manually using Swath and subset editors modules of the Caris HIPS/SIPS software. 8. All the data for each bathymetric, motion sensor, DGPS, heading, tide and sound velocity profile data were merged to produce the final processed data file. A weighted grid of the processed data was then created for each Block. In GA the tide was applied to the grid to correct for tidal variations and velocity corrections were performed to correct for different artefacts and mismatches. 9. The processed data was finally exported as grids soundings or false coloured images for presentation and reporting and as final processed data in ASCII XYZ as well as geotif formats of 50, 70 and 80m resolution. - Vertical Datum: MSL - Horizontal Datum: WGS84 UTM Zones 56, 57 and 58S.
Parent Information
Extents
[-28, -14.5, 153, 165]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Lord Howe Rise Z56 Interp 2016 50 - 80m (tif) [6.32 MB]
Lord Howe Rise Z56 Trans 1 2016 50 - 80m (tif) [3.89 MB]
Lord Howe Rise Z56 Trans 2 2016 50 - 80m (tif) [10.76 MB]
Lord Howe Rise Z56 Trans 3 2016 50 - 80m (tif) [4.88 MB]
Lord Howe Rise Z57 Interp 2016 50 - 80m (tif) [35.09 MB]
Lord Howe Rise Z57 Trans 1 2016 50 - 80m (tif) [2.95 MB]
Source Information