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Otway Basin [Hamilton,Portland,Colac], Vic, 1989 (GSV0362) (P563), magnetic line data, AWAGS levelled

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Created 14/01/2025

Updated 14/01/2025

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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 Otway Basin [Hamilton,Portland,Colac], Vic, 1989 (GSV0362) survey were acquired in 1989 by the VIC Government, and consisted of 27694 line-kilometres of data at 1500m line spacing and 100m 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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Title Otway Basin [Hamilton,Portland,Colac], Vic, 1989 (GSV0362) (P563), magnetic line data, AWAGS levelled
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/8661c1d8-d779-49df-a85d-9c129011a587
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 15/11/1989 - 16/12/1989
Geospatial Coverage {"type": "Polygon", "coordinates": [[[140.8818, -39.0286], [144.111, -39.0286], [144.111, -36.9614], [140.8818, -36.9614], [140.8818, -39.0286]]]}
Data Portal data.gov.au