This record summarises the basement-related studies undertaken in the NABRE project. It includes various transformations of the north Australian regional aeromagnetics and gravity datasets, estimates of depths to magnetic sources for northern Australia, and eight regional traverse models for the region.

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The Bureau of Mineral Resources, Geology and Geophysics contributes to the Australian National Antarctic Research Expeditions by operating geomagnetic and seismological observatories at Mawson and Macquarie Island, operating a seismological observatory at Casey, providing an observer for the Mawson observatories, assisting in the operation and calibration of the Antarctic Division geomagnetic monitoring programs at Davis and Casey, and by performing geophysical and geological field work in Antarctica. This report describes the operation of the Mawson geomagnetic and seismological observatories from 23 December 1988 until 2 January 1990. It also describes a brief visit to Davis to perform calibrations on the local geomagnetic instruments in March 1990. It includes an analysis of Mawson geomagnetic data from 1 January 1989 UTC until 31 December 1989 UTC (inclusive).

This report summarises the data from the Mawson Geomagnetic Observatory from January 1989 to December1989 inclusive. Daily and hourly averages of each of the standard geomagnetic components (X, Y, Z, F, H, D and I) are given foreach month for all days, international quiet days and international disturbed days. The monthly average mean-hourly-values on international quiet days are graphed to show any regularity in diurnal variation and its changethroughout the year. The recording systems and absolute calibrations of the data are described in detail in the Mawson GeophysicalObservatory Annual Report, 1989 (Crosthwaite, 1991).

The network description is a short document summarising the characteristics of a regional network of magnetic repeat stations, the instruments and observational procedures employed, the data reduction methods used, and a list of the models and charts produced. A diagram showing the locations of the stations, and a list of related publications may also be included.

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Legacy product - no abstract available

Mawson is an Australian National Antarctic Research Expedition base on the Antarctic mainland managed by the Australian Antarctic Division. Geomagnetic and seismological recording and processing equipment was maintained and calibrated by an observer provided by the Australian Geological Survey Organisation (AGSO) during 1994. Earthquake phase data was reported weekly to AGSO and to the National Earthquake Information Service (Boulder, Colorado) via email. Magnetic results were reported monthly to AGSO, and to the French Department de Geomanetisme et Paleomagnetism for use in the Oersted magnetic satellite project. Magnetic results indicate the secular variation of the field at Mawson was relatively unchanged over the year, with a three nanoteslas decrease in total intensity and a 5.5 minute increase in westerly declination. Magnetic data recorded at the Casey and Davis Antarctic bases was processed by the Mawson observer and indicated similar relative stability.