A Magnetic Survey of the Southwest Pacific Ocean
The design and construction of a free precession proton magnetometer which give a reading of the field directly in gamma is described. This instrument has been used to obtain magnetic profiles across the Southwest Pacific Ocean during the 1963-65 summer Antarctic supply cruises of H.M.N.Z.S. Endeavo...
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ftvictoriauwfig:oai:figshare.com:article/16945861 2023-05-15T13:35:14+02:00 A Magnetic Survey of the Southwest Pacific Ocean Ross, David Irwin 1966-01-01T00:00:00Z https://doi.org/10.26686/wgtn.16945861.v1 https://figshare.com/articles/thesis/A_Magnetic_Survey_of_the_Southwest_Pacific_Ocean/16945861 unknown doi:10.26686/wgtn.16945861.v1 https://figshare.com/articles/thesis/A_Magnetic_Survey_of_the_Southwest_Pacific_Ocean/16945861 Author Retains Copyright Atomic Molecular Nuclear Particle and Plasma Physics not elsewhere classified Surface magnetic field Nuclear magnetometers Endeavour (Ship) Terrestrial magnetism School: School of Chemical and Physical Sciences 020299 Atomic Marsden: 240302 Nuclear and Particle Physics Marsden: 240203 Condensed Matter Physics-Electronic and Magnetic Properties Superconductivity Degree Discipline: Physics Degree Level: Doctoral Degree Name: Doctor of Philosophy Text Thesis 1966 ftvictoriauwfig https://doi.org/10.26686/wgtn.16945861.v1 2021-11-11T00:04:50Z The design and construction of a free precession proton magnetometer which give a reading of the field directly in gamma is described. This instrument has been used to obtain magnetic profiles across the Southwest Pacific Ocean during the 1963-65 summer Antarctic supply cruises of H.M.N.Z.S. Endeavour. The magnetic and bathymetric profiler obtained on these cruises have been analysed to determine the nature and structure of the oceanic crust in this region. The region is divided into four divisions. (l) The New Zealand Plateau, with an almost continental crustal thickness. (2) The Southwest Pacific Basin, at a depth of 3,000 fathoms. (3) The Pacific-Antarctic Ridge, pert of the world encircling mind-ocean ridge system. (4) The Ross Sea, an epicontinental sea across the Antarctic continental shelf. Subtraction of the regional field form the magnetic results has enabled a regional field map of the area to be drawn. Comparison with earlier results indicates a westward drift of the earth's field of approximately 0.25 degrees /yr. Some discussion of regional anomalies (~ 100 miles period) has been given. Because of the excellent correlation of magnetic anomalies from track to track across the basin it has been possible to draw an anomaly contour map of this part. This map illustrates the predominantly east-west trend of features over the basin. To the north the features parallel the edge of the New Zealand Plateau. To the south the features swing more towards the Pacific-Antarctic Ridge. A major discontinuity is indicated along a direction 9 degrees E of S meeting the Plateau just southwest of Antipodes Islands. If this discontinuity is extrapolated south to the ridge it meets it at approximately 180 degrees E, where the ridge turns N-E towards Easter Island. Across the ridge the magnetic pattern shows three distinct regions. Over the northern flanks large anomalies are evident but the correlation of anomalies from track to track is very poor. Further south, across the upper flanks, the magnetic records are very much ... Thesis Antarc* Antarctic Antipodes Islands Ross Sea Open Access Victoria University of Wellington / Te Herenga Waka Antarctic Endeavour ENVELOPE(162.000,162.000,-76.550,-76.550) Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) New Zealand Pacific Ross Sea The Antarctic |
institution |
Open Polar |
collection |
Open Access Victoria University of Wellington / Te Herenga Waka |
op_collection_id |
ftvictoriauwfig |
language |
unknown |
topic |
Atomic Molecular Nuclear Particle and Plasma Physics not elsewhere classified Surface magnetic field Nuclear magnetometers Endeavour (Ship) Terrestrial magnetism School: School of Chemical and Physical Sciences 020299 Atomic Marsden: 240302 Nuclear and Particle Physics Marsden: 240203 Condensed Matter Physics-Electronic and Magnetic Properties Superconductivity Degree Discipline: Physics Degree Level: Doctoral Degree Name: Doctor of Philosophy |
spellingShingle |
Atomic Molecular Nuclear Particle and Plasma Physics not elsewhere classified Surface magnetic field Nuclear magnetometers Endeavour (Ship) Terrestrial magnetism School: School of Chemical and Physical Sciences 020299 Atomic Marsden: 240302 Nuclear and Particle Physics Marsden: 240203 Condensed Matter Physics-Electronic and Magnetic Properties Superconductivity Degree Discipline: Physics Degree Level: Doctoral Degree Name: Doctor of Philosophy Ross, David Irwin A Magnetic Survey of the Southwest Pacific Ocean |
topic_facet |
Atomic Molecular Nuclear Particle and Plasma Physics not elsewhere classified Surface magnetic field Nuclear magnetometers Endeavour (Ship) Terrestrial magnetism School: School of Chemical and Physical Sciences 020299 Atomic Marsden: 240302 Nuclear and Particle Physics Marsden: 240203 Condensed Matter Physics-Electronic and Magnetic Properties Superconductivity Degree Discipline: Physics Degree Level: Doctoral Degree Name: Doctor of Philosophy |
description |
The design and construction of a free precession proton magnetometer which give a reading of the field directly in gamma is described. This instrument has been used to obtain magnetic profiles across the Southwest Pacific Ocean during the 1963-65 summer Antarctic supply cruises of H.M.N.Z.S. Endeavour. The magnetic and bathymetric profiler obtained on these cruises have been analysed to determine the nature and structure of the oceanic crust in this region. The region is divided into four divisions. (l) The New Zealand Plateau, with an almost continental crustal thickness. (2) The Southwest Pacific Basin, at a depth of 3,000 fathoms. (3) The Pacific-Antarctic Ridge, pert of the world encircling mind-ocean ridge system. (4) The Ross Sea, an epicontinental sea across the Antarctic continental shelf. Subtraction of the regional field form the magnetic results has enabled a regional field map of the area to be drawn. Comparison with earlier results indicates a westward drift of the earth's field of approximately 0.25 degrees /yr. Some discussion of regional anomalies (~ 100 miles period) has been given. Because of the excellent correlation of magnetic anomalies from track to track across the basin it has been possible to draw an anomaly contour map of this part. This map illustrates the predominantly east-west trend of features over the basin. To the north the features parallel the edge of the New Zealand Plateau. To the south the features swing more towards the Pacific-Antarctic Ridge. A major discontinuity is indicated along a direction 9 degrees E of S meeting the Plateau just southwest of Antipodes Islands. If this discontinuity is extrapolated south to the ridge it meets it at approximately 180 degrees E, where the ridge turns N-E towards Easter Island. Across the ridge the magnetic pattern shows three distinct regions. Over the northern flanks large anomalies are evident but the correlation of anomalies from track to track is very poor. Further south, across the upper flanks, the magnetic records are very much ... |
format |
Thesis |
author |
Ross, David Irwin |
author_facet |
Ross, David Irwin |
author_sort |
Ross, David Irwin |
title |
A Magnetic Survey of the Southwest Pacific Ocean |
title_short |
A Magnetic Survey of the Southwest Pacific Ocean |
title_full |
A Magnetic Survey of the Southwest Pacific Ocean |
title_fullStr |
A Magnetic Survey of the Southwest Pacific Ocean |
title_full_unstemmed |
A Magnetic Survey of the Southwest Pacific Ocean |
title_sort |
magnetic survey of the southwest pacific ocean |
publishDate |
1966 |
url |
https://doi.org/10.26686/wgtn.16945861.v1 https://figshare.com/articles/thesis/A_Magnetic_Survey_of_the_Southwest_Pacific_Ocean/16945861 |
long_lat |
ENVELOPE(162.000,162.000,-76.550,-76.550) ENVELOPE(66.067,66.067,-67.867,-67.867) |
geographic |
Antarctic Endeavour Marsden New Zealand Pacific Ross Sea The Antarctic |
geographic_facet |
Antarctic Endeavour Marsden New Zealand Pacific Ross Sea The Antarctic |
genre |
Antarc* Antarctic Antipodes Islands Ross Sea |
genre_facet |
Antarc* Antarctic Antipodes Islands Ross Sea |
op_relation |
doi:10.26686/wgtn.16945861.v1 https://figshare.com/articles/thesis/A_Magnetic_Survey_of_the_Southwest_Pacific_Ocean/16945861 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.16945861.v1 |
_version_ |
1766063167623921664 |