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Geophysical (gravity and seismic reflection and refraction surveys) and oceanographic measurements in the Ross Sea to study the Ross Sea basin
Entry ID: K101_1980_1981_NZ_1


Summary
Abstract: Geophysical and oceanographic investigations were conducted in the Ross Sea during a McMurdo Sound to McMurdo Sound charter aboard the MV Benjamin Bowring. The main geophysical program was designed to study three regions in the Ross Sea including the Eastern Ross Sea basin and continental margin, the Western Ross Sea Graben and the Transantarctic Mountains front. The objective for the Eastern Ross Sea basin and continental margin was to complete gravity and seismic reflection and refraction data along profiles from the ice shelf to about 73S along 170W and 165W. A link to the Deep Sea Drilling Program sites 270-272 would be made using existing Eltanin or Explora data. For the Western Ross Sea Graben, an east-west profile from 180 to 165E along latitude 75.5S was planned. Gravity and seismic reflection and refraction measurements were measured. For the Transantarctic Front, six east-west profiles about 30km apart running westwards from longitude 170E to as near the Victoria Land coastline as ice conditions permitted was planned. Gravity and seismic reflection and refraction data were measured. The oceanographic program had two objectives, i) to sample the water mass at depths down to 300m to investigate the distribution of hard shelled phytoplankton between New Zealand and the Ross Ice Shelf, and ii) to obtain seafloor sediment samples along the ice front in McMurdo Sound. The plan was to consist of water bottle stations at every degree of latitude from 46S to the edge of the Ross Ice Shelf, from Lyttelton, New Zealand to McMurdo Sound, and underway marine gravity measurements were planned for between bottle stations. On the voyage to McMurdo Sound, the oceanographic program and gravity measurements were carried out. The program consisted of water sampling to depths of 250m at station intervals of one degree latitude. However, rough sea conditions and violent ship motion curtailed the program and 8 stations were successfully completed. Gravity observations were made for most of the voyage but rough sea conditions shut down the meter for a couple of days and made data at other times marginal. Bathymetric data were recorded until depths of about 4000 m were reached when signal strength was too small and no record obtained. The results for the data collected from Lyttelton to McMurdo Sound includes 3700km of gravity measurements, 1000km of bathymetry measurements and 8 stations for oceanographic measurements. Due to ice conditions in the Ross Sea and equipment problems various measurements were collected for the Eastern Ross Sea basin and continental margin, the Western Ross Sea Graben and the Transantarctic Mountains front. Final results include 4200km of gravity measurements, 3200km seismic reflection profiling measurements, 25 sonobuoy seismic refraction observations and 6 shallow gravity core stations (5 successful).

Related URL
Link: View Related Information
Description: Seismic data collected in Antarctica is required to be lodged with the Seismic Data Librabry system.

Geographic Coverage
 N: -46.0 S: -78.0  E: -150.0  W: 150.0

Data Set Citation
Version: Not provided


Temporal Coverage
Start Date: 1981-01-06
Stop Date: 1981-02-27


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR
OCEAN > SOUTHERN OCEAN > ROSS SEA


Science Keywords
OCEANS >MARINE GEOPHYSICS >MAGNETIC ANOMALIES    [Definition]
OCEANS >MARINE GEOPHYSICS >MARINE GRAVITY FIELD    [Definition]
SOLID EARTH >GRAVITY/GRAVITATIONAL FIELD >CONTROL SURVEYS    [Definition]
SOLID EARTH >GRAVITY/GRAVITATIONAL FIELD >CRUSTAL MOTION    [Definition]
SOLID EARTH >GRAVITY/GRAVITATIONAL FIELD >CRUSTAL MOTION >OCEAN CRUST DEFORMATION    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >BATHYMETRY    [Definition]


Platform
SHIPS    [Information]


Instrument
GRAVIMETERS    [Information]
SEISMIC REFLECTION PROFILERS    [Information]


Quality
The data is contained in the publications and with the Seismic Data Library System online. Please contact the investigator for more information.


Data Set Progress
COMPLETE


Data Center
Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand    [Information]
Data Center URL: http://www.antarcticanz.govt.nz/

Data Center Personnel
Name: SHULAMIT GORDON
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Personnel
FRED DAVEY
Role: INVESTIGATOR
Phone: +64 4 473 8208
Fax: +64 4 471 0977
Email: fred.davey at gns.cri.nz
Contact Address:
IGNS
PO Box 1320
Kelburn
City: Wellington
Country: NEW ZEALAND


CEISHA POIROT
Role: METADATA AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: c.poirot at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


SHULAMIT GORDON
Role: METADATA AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 2009-06-22
Last DIF Revision Date: 2018-10-01



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