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  • This grid is derived from gravity observations stored in the Australian National Gravity Database (ANGD) as at February 2016 as well as data from the 2013 New South Wales Riverina gravity survey. Out of the approximately 1.8 million gravity observations 1,371,998 gravity stations in the ANGD together with 19,558 stations from the Riverina survey were used to generate this image. The grid shows isostatic residual gravity anomalies over onshore continental Australia. The data used in this grid has been acquired by the Commonwealth, State and Territory Governments, the mining and exploration industry, universities and research organisations from the 1940's to the present day. The isostatic corrections were based on the assumption that topographic loads are compensated at depth by crustal roots following the Airy-Heiskanen isostatic principle. A crustal density of 2670 kg/m3 was used for the isostatic correction, with an assumed density contrast between the crust and mantle of 400 kg/m3. An initial average depth to Moho at sea level of 37 km was used in the calculation. The isostatic corrections were then applied to the Complete Bouguer Gravity Anomaly Grid of Onshore Australia 2016 to produce the Isostatic Residual Gravity Anomaly Grid of Onshore Australia 2016.

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Alton Downs Gravity (P196240) contains a total of 3868 point data values acquired at a spacing between 804 and 6436 metres. The data is located in QLD, SA and were acquired in 1962, under project No. 196240 for Delhi Petroleum Pty Ltd.

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Tambo-Augathella Gravity (P196030) contains a total of 1451 point data values acquired at a spacing of 750 metres. The data is located in QLD and were acquired in 1960, under project No. 196030 for Magellan Petroleum Australia Ltd.

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Kulgera-Alice Springs Gravity (P196106) contains a total of 1 point data values acquired at a spacing of None metres. The data is located in NT and were acquired in 1961, under project No. 196106 for None.

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 North Eastern NSW-South Eastern Qld Gravity (P196105) contains a total of 330 point data values acquired at a spacing of 6500 metres. The data is located in NSW and were acquired in 1961, under project No. 196105 for Bureau of Mineral Resources (BMR).

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Goondiwindi Detail Gravity (P196114) contains a total of 571 point data values acquired at a spacing of 402 metres. The data is located in QLD and were acquired in 1961, under project No. 196114 for None.

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Alice Springs Gravity (P196113) contains a total of 163 point data values acquired at a spacing of 402 metres. The data is located in NT and were acquired in 1961, under project No. 196113 for Bureau of Mineral Resources (BMR).

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Maffra-Bruthen Gravity (P195303) contains a total of 54 point data values acquired at a spacing between 600 and 800 metres. The data is located in VIC and were acquired in 1953, under project No. 195303 for Bureau of Mineral Resources (BMR).

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Kimberley Region Gravity (P195308) contains a total of 113 point data values acquired at a spacing between 3000 and 5500 metres. The data is located in WA and were acquired in 1953, under project No. 195308 for Bureau of Mineral Resources (BMR).

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    Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected 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 Geraldton-Carnarvon, Canning Basin Gravity (P195307) contains a total of 1 point data values acquired at a spacing between 402 and 8045 metres. The data is located in WA and were acquired in 1953, under project No. 195307 for Bureau of Mineral Resources (BMR).