grav
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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 Tickera Road Gravity (P197661) contains a total of 448 point data values acquired at a spacing of 500 metres. The data is located in SA and were acquired in 1976, under project No. 197661 for Department of Mines and Energy South Australia (SADME).
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The force of gravity at any point on the earth's surface can vary by as much as 300 microgals (1 microgal = 1x10-8 m/s2) over a 6 hour period due to the gravitational attraction of the sun and the moon as they move in relation to the earth. This variation in gravity is called the earth tide. The earth tide is made up of the body tide, which is the direct gravitational effect of the sun and the moon; and the ocean load tide, which is the effect of the shifting mass of the earth's oceans also due to the sun and the moon. Comparison of five tidal prediction computer programs, two of which attempt to model the ocean load tide, with superconducting gravimeter observations at Mt Stromlo, ACT, has found that they all predicted the earth tide to within 6 microgals standard deviation of the observed tidal variation. The two programs that used an ocean tide model predicted the earth tide to better than 1.2 microgals standard deviation. Tidal gravity observations made at Sydney, Parkes and Cobar in NSW, and at Mt Stromlo in the ACT, were compared with predicted earth tides to determine the accuracy of these predictions, particularly for the ocean load tides, at both coastal and inland sites. All of the computer programs tested are capable of predicting the earth tide to sufficient accuracy for most relative gravity applications, such as for exploration purposes. Where accuracies of better than 10 microgals are required, such as with a portable absolute gravimeter or precise microgravity surveys, a program that uses a global ocean tide model is necessary. If better than 5 microgals accuracy is required, such as with precise absolute gravity measurements, a global ocean tide model is not sufficient and one that better suits the local region is required.
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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 Gravity Survey (P197662) contains a total of 138 point data values acquired at a spacing between 500 and 1000 metres. The data is located in SA and were acquired in 1976, under project No. 197662 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 Stuart Shelf Detailed Gravity (P197666) contains a total of 219 point data values acquired at a spacing between 500 and 700 metres. The data is located in SA and were acquired in 1976, under project No. 197666 for Department of Mines and Energy South Australia (SADME).
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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 Barabba, Mallala, Balaklava Detailed Gravity (P197665) contains a total of 93 point data values acquired at a spacing between 700 and 1500 metres. The data is located in SA and were acquired in 1976, under project No. 197665 for Department of Mines and Energy South Australia (SADME).
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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 Gravity Survey (P197672) contains a total of 18 point data values acquired at a spacing of 7500 metres. The data is located in SA and were acquired in 1976, under project No. 197672 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 Stuart Shelf (P197668) contains a total of 1039 point data values acquired at a spacing between 100 and 500 metres. The data is located in SA and were acquired in 1976, under project No. 197668 for Department of Minerals and Energy (Victoria).
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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 Mt Ainslie-Black Mountain Gravity (P197691) contains a total of 2 point data values acquired at a spacing of 3100 metres. The data is located in ACT and were acquired in 1976, under project No. 197691 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 Pilbara Crustal Gravity (P197701) contains a total of 2158 point data values acquired at a spacing between 1600 and 2000 metres. The data is located in WA and were acquired in 1977, under project No. 197701 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 Stuart Shelf (P197721) contains a total of 1362 point data values acquired at a spacing between 100 and 1000 metres. The data is located in SA and were acquired in 1977, under project No. 197721 for Department of Minerals and Energy (Victoria).