P630tmig 6304

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. This P630tmig 6304 has a cell size of 0.00083 degrees (approximately 82m). The units are in nanoTesla (or nT). The data used to produce this grid was acquired in 1994 by the TAS Government, and consisted of 93301 line-kilometres of data at a line spacing between 400m and 800m, and 130m terrain clearance.

Data and Resources

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Additional Information

Field Value
Published (Metadata Record) 02/03/2026
Last updated 03/03/2026
Organisation Australian Federal Government
License License Not Specified
Update Frequency Unknown