A Geomorphologic, Seismic and Magnetic Study of the Astrid Ridge, Dronning Maud Land, Antarctica

Access URI: http://npdc.ncaor.gov.in/npdc/search_mf_data.action?search=freeText&expedition_type=all&parameter=MF-2105230920&userType=user&freeTextValue=A+Geomorphologic%2C+Seismic+and+Magnetic+Study+of+the+Astrid+Ridge%2C+Dronning+Maud+Land%2C+Antarctica

Brief Description (Abstract):

Astrid ridge rising from a depth of about 4000 m to 1000 m is a prominent feature on the continental margin of Dronning MaudLand. The ridge was studied by a six E-W and one N-S tracks comprising 458 1km of echosounding, 405 Ikm of seismic profiling and452 Ikm of magnetics. The crest of the ridge in the area surveyed trends N-S in the south but veers to NNW-SSE afabout 68?S Lat. and is reported to change to NNE-SSW at about 67?S Lat. The crest of the ridge in the south is marked by a flat area at about 1500 m which deepens to 1700 to 1900 at about 68? Lat. The western flanks of the ridge in the south are gently sloping while the eastern flanksare marked by NNE-SSW trending scarps of about 80-280 m. The northern area is marked by a NW to NNW-SE to SSE trending valley about 5-15 km wide and 240-380 m deep.

Status: Completed

Purpose: The International Indian Ocean Expedition in the early 1960s considerably enhanced the knowledge of the marine geology and geophysics of the Indian Ocean and to a large extent of the continental margins. The expedition provided an impetus to marine geological and geophysical studies of the continental margins of the countries bordering the Indian Ocean. However, because of the ice cover and hostile environment, the continental margins of Antarctica still remain poorly studied. The study of the marinegeology and geophysics of the Antarctic continental margins is of considerable value in the breaking, drift and reconstruction of the Indian, Antarctic and Australian plates.

Presentation Format: Documentdigital

Distribution Format: Land Surface

Distribution Format Version: unknown

Supplemental Information:

TableDigital

Keyword(s): Earth Science-Land Surface,

Place/Location(s): Queen Maud Land, Antarctic,

Project: A Geomorphologic,

Topic Category(s): GeoScientific Information,

Date(s): 2020-08-21 (Creation),

Resource Contact(s):
1. Name : Dr. H N Siddiguie
    Role : PrincipalInvestigator
    Phone : 8322525515
    E-Mail : ictd [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Distributor Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : Distributor
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Metadata Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : PointOfContact
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Extent:
Start Date : 1981-01-01
End Date   : 1982-12-31