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Gravity

105 record(s)
 
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  • This image 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 image shows isostatic residual gravity anomalies over onshore continental Australia. The data used in this image 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. The Isostatic Residual Gravity Anomaly Grid of Onshore Australia 2016 has been image enhanced and displayed as a hue-saturation-intensity (HSI) image with sun shading from the northeast to create this product.

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  • Image showing the gravity station coverage and relative reliability over Australia, Updated to June 2016

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  • Geoscience Australia conducted the Southeastern Mt Isa 2D seismic survey in 2014. The survey involved the acquisition of seismic reflection and gravity data along a single traverse (14GA-CF1) 670km long from Longreach through to Four-ways via Winton. The project was a collaboration between Geoscience Australia and the Geological Survey of Queensland with funding from the Queensland Governments Greenfields 2020 Program. The primary objective of the survey was to image the architecture of the southeastern Mount Isa Inlier and northern Galilee and Millungera Basins. As well as understanding the structural control the Cork Fault plays on resources within the region. <b>Raw data for this survey are available on request from clientservices@ga.gov.au - Quote eCat# 89638</b>

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