Seafloor Mapping of the South-east Region and Adjacent Waters : AUSTREA-2 Cruise Report: South-east of Tasmania and Southern Macquarie Ridge

In January/February 2000, the Australian Geological Survey Organisation (AGSO)

completed a 2S-day seabed swath-mapping and geophysical survey off south and

south-east Tasmania and south of Macquarie Island for the National Oceans Office

and Environment Australia. The survey, which is named AUSTREA-2 and designated

as AGSO Cruise 223, used the 8S-m French oceanographic and geoscience research

vessel N/O L 'Atalante, which departed Hobart on January IS and arrived in Bluff,

New Zealand, on February 9. The survey covered about 10,200 km and mapped about

140,000 km2 of seabed. The initial impetus for the work was to map the foot-of-slope

position in several areas to support definition of Australia's legal Continental Shelf

under the United Nations Convention on the Law of the Sea. A significant additional

but complementary aspect was to support marine zone planning and management, and

assessment of seabed living and non-living (petroleum and mineral) resources, as an

important step towards implementation of Australia's Oceans Policy and Australia's

Marine Science and Technology Plan, and, in particular, the development of the

South-east Regional Marine Plan by the National Oceans Office.

Geophysical data collected included Simrad EM12D swath bathymetry and

backscatter, 6-channel GI-gun seismic, 3.S kHz sub-bottom profiling, and gravity and

magnetic profiles. This was augmented by a suite of oceanographic data, such as

seawater temperature, and both current and salinity depth profiles. Weather and sea

conditions were highly favourable, particularly in the more southern latitudes.

Occasional periods of rough weather resulted in higher noise levels, but did not

seriously affect acquisition, and data quality was generally excellent.

The work conducted off Tasmania was mostly to fill in and extend previous swath

coverage, and map the foot-of-slope along the eastern margin of the South Tasman

Rise. It highlighted features such as the major development of slope canyons down

the eastern Tasmanian margin, and the complex character of the Cascade Seamount

and other seamounts adjacent to the South Tasman Rise.

The work conducted over the southern Macquarie Ridge Complex highlighted

features such as: a high-relief axial valley adjoining the deep Hjort Trench; the

broadening to the south of the submerged Hjort Ridge, east of the Hjort Trench; the

development of seafloor spreading tectonic fabric across the Hjort Ridge summit; and

the presence of a linear trough/ridge feature that obliquely truncates the southern end

of the Hjort Trench and adjoining axial valley.

A full set of shipboard maps are held by the National Oceans Office and AGSO, and

copies of the digital data are stored at AGSO. All data from the survey will be

managed jointly by AGSO and the National Oceans Office.

Simple

Identification info

Date (Publication)
2000-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/35638

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Australian Geological Survey Organisation

 Canberra
Author

Bernardel, G.

 1
Author

Alcock, M.

 2
Author

Petkovic, P.

 3
Author

Thomas, S.

 4
Name

Record

Issue identification

2000/046

ISBN

0642398682

Point of contact
Role Organisation / Individual Name Details
Custodian

ED
Owner

Commonwealth of Australia (Geoscience Australia)
Custodian

Commonwealth of Australia (Geoscience Australia)

 Voice
Topic category
  • Geoscientific information

Extent

N
S
E
W


Maintenance and update frequency
Unknown

Resource format

Title

Product data repository: Various Formats

Website

Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

Keywords

  • GA Publication

  • Record

Theme

  • marine survey

Theme

  • geophysics

Theme

  • continental margins

Theme

  • marine

Keywords

  • AU-TAS

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

Keywords

  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

 Voice
OnLine resource

Download the Record (pdf)

Download the Record (pdf)

Distribution format

  • pdf

Resource lineage

Statement

Unknown

Hierarchy level
Non geographic dataset
Other

GA Publication

Description

Source data not available.

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/a05f7892-b4e6-7506-e044-00144fdd4fa6

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

 Voice

Type of resource

Resource scope
Document
Name

GA Record

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/35638

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/a05f7892-b4e6-7506-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:04:20
Date info (Creation)
2000-12-19T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

continental margins geophysics marine marine survey

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