Reflection seismic, magnetic, gravimetric survey of the Scotia Plate, Antarctica (Summer 1989-90, 1990-91)

During the Antarctic summers from1989 - 1990 to 1990 - 1991,
the Osservatorio Geofisico Sperimentale realized a geophysical survey
in the Ross Sea, making use of the Research Vessel OGS - Explora,
collecting magnetic, gravimetric and seismic data. This research has
been carried out in the context of the Nation Research Program in
Antarctic (PNRA), coordinated by the Italian ENEA, under the auspices
of the Italian Ministry for Scientific and Technological Research.
The parameters for the different campaign are:

Summer 1989-90:

in cooperation with the United States Geological Survey (USGS), the
survey interested four different areas: the Scotia Plate, the
Antarctic Peninsula, the South Pacific Ocean and the Ross Sea. The
first part of the survey has been dedicated to the Scotia Plate area
where 5 profiles have been collected for a total of about 1,850 km, by
using the following parameters:

Coverage 3000%
Record Length 14 sec
Sample Rate 4 ms
Shot Interval 50 m
Streamer Length 3000 m
Streamer Depth 12 m
Number of Groups 120
Group Interval 25 m
Air-Guns:
- Total Volume 45.16 1
- Pressure 140 bar
- Depth 6 m

December 1990, January, February and March 1991:

The survey interested mainly three different areas: the South Pacific
Ocean, the Ross Sea and the Scotia Plate. The program in the Scotia
Plate is the continuation of the research performed in this area
during the previous year. During this campaing about 3,560 km of
reflection seismic, magnetic and gravity data have been collected
along 16 lines in this area, by using the following parameters:

Coverage 3000%
Record Length 14 sec
Sample Rate 4 ms
Shot Interval 50 m
Streamer Length 3000 m
Streamer Depth 12 m
Number of Groups 120
Group Interval 25 m
Air-Guns:
- Total Volume 45.16 1
- Pressure 140 bar
- Depth 6 m

Source Name:Research Vessel > OGS-Explora

Sensor Name:ASTR1>Analogic streamer, Prakla
Sensor Name:MSREC1>Multichannel seismic recorder,Sercel 358
Sensor Name:BGV2>Gravimetric Bodenseewerk, KSS31
Sensor Name:GMG1>Magnetometer Geometrics, G801-803