magnetic
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Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. These line dataset from the Murrindal, Vic, 1996 VIMP Survey (GSV3060) survey were acquired in 1995 by the VIC Government, and consisted of 15589 line-kilometres of data at 200m line spacing and 80m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.
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Magnetic modelling of two and three-dimensional bodies : test programs and subroutines in FORTRAN 77
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A first-order survey of eight magnetic stations in the southwest Pacific Ocean was conducted by the Bureau of Mineral Resources during June and July 1989. The purpose was to provide accurate information about the geomagnetic secular variation in the region to improve and extend the Australian Geomagnetic Reference Field, and for inclusion in global models of the field (notably IGRF) to improve their accuracy over the Australian region. The observed value of magnetic elements and preliminary mean hourly values for declination, horizontal intensity, vertical intensity and total intensity at the epoch of occupation are given. Station and reference mark descriptions are included, together with general information about each locality visited.
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