666a7d53-5e31-4b44-9bbe-6a561a114a1a urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T14:28:22 creation ISO 19115 2016 Australian long-wavelength magnetic anomalies 666a7d53-5e31-4b44-9bbe-6a561a114a1a 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. Earth Sciences GA Publication Journal Published_External Journal article (pdf) documentDigital Journal article (pdf) PDF Unnamed resource documentDigital HTML