From Geoscience Australia
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Australian long-wavelength magnetic anomalies

Created 17/10/2025

Updated 17/10/2025

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A long-wavelength magnetic anomaly map is derived from near-surface observations. The data can be continued upward for comparison with maps derived from satellite data. Compared with a map from 400-km altitude observations of the MAGSAT satellite, the highs and lows are in a similar geographic position, but the MAGSAT map is smoothed, possibly by uncorrected variations in satellite altitude. The long-wavelength magnetic anomalies have no significant correlation with heat flow or seismically measured crustal thickness, and have an amplitude higher than that expected for a non-magnetic sediment. In central and western Australia, magnetic highs are spatially associated with crustal block boundaries defined by elongate, high-amplitude, associated gravity highs and lows. Consequently, the long-wavelength magnetic anomalies are thought to be caused by rocks of high magnetisation in the upper or lower crust.

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Additional Info

Field Value
Title Australian long-wavelength magnetic anomalies
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/666a7d53-5e31-4b44-9bbe-6a561a114a1a
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Australian long-wavelength magnetic anomalies". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/australian-long-wavelength-magnetic-anomalies