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9.5 Option - Geophysics: 2. Remote sensing

Syllabus reference (October 2002 version)
2. Some physical phenomena such as gravitation and radiation provide information about the Earth at a distance from it
Students learn to: Students:

Extract from Physics Stage 6 Syllabus (Amended October 2002). © Board of Studies, NSW.

Prior learning: Preliminary modules 8.2, 8.3, 8.4.

Background: Most if not all, large mineral deposits now found in the world are found by the utilising processes of remote sensing. The ability of remote sensing techniques to provide baseline data for widespread environmental management programs is immense. Without remote sensing it is unlikely that many of the mineral deposits recently found would have been found. The techniques are relatively non invasive and hence cause little or no damage to the areas under study.

perform a first-hand investigation to gather data to demonstrate the relationship between the nature of a surface and the radiation reflected from it

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describe how absorption and reflection of radiation can provide information about the reflecting surface

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explain how remote sensing techniques can be used to monitor climate, vegetation and pollution

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identify two uses of the remote sensing of radiation in mineral exploration

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process information to describe the significance of Jean Richer's experiments with the pendulum in disproving the spherical Earth hypothesis

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solve problems and analyse information to calculate the mass of the Earth given g and the diameter of the Earth

Note that the gravity difference around the world at different locations would result in differences in the calculation of the mass of the Earth.

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outline reasons why the gravitational field of the Earth varies at different points on its surface

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describe how the paths of satellites are used to study the Earth's gravity

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solve problems and analyse information to calculate the mass of the Earth given the period and the altitude of a satellite: r-cubed formula

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outline the structure and function of a gravimeter

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describe the purpose of data reduction in gravity surveys

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process information from secondary sources to reduce collected gravity data

CLIENT: XYZ MINERALS
GRAVITY METER : Gxyz
Station Field Reading Time / Elapsed time (minutes) Drift corrected reading Meter scale constant Relative gravity Elevation
(m)
Latitude correction Bouguer Gravity
Easting Northing
1000 0000 2360.62 0942 (0) 2360.62 1.00799 0.00 0.00    
1000 0100 2364.00 0947 (5) 2364.00 1.00799 3.41 1.00    
    2364.00 0949(7) 2364.00 1.00799 3.41 1.00    
1000 0200 2366.10 0953(11) 2366.09 1.00799 5.51 2.00    
    2366.12 0955 (13) 2366.11 1.00799 5.53 2.00    
1000 0300 2368.00 0959 (17) 2367.99 1.00799 7.43 3.00    
    2368.00 1001 (19) 2367.98 1.00799 7.42 3.00    
1000 0400 2369.00 1005 (23) 2368.98 1.00799 8.43 4.00    
    2369.02 1007 (25) 2369.00 1.00799 8.45 4.00    
1000 0500 2370.82 1011 (29) 2370.80 1.00799 10.26 5.00    
    2370.84 1013 (31) 2370.81 1.00799 10.27 5.00    
1000 0600 2371.62 1017 (35) 2371.59 1.00799 11.05 5.50    
    2371.62 1020 (38) 2371.59 1.00799 11.05 5.50    
1000 0700 2370.82 1024 (42) 2370.79 1.00799 10.25 5.00    
    2370.84 1026 (44) 2370.80 1.00799 10.26 5.00    
1000 0800 2369.00 1030 (48) 2368.96 1.00799 8.41 4.00    
    2369.02 1032 (50) 2368.98 1.00799 8.43 4.00    
    2368.98 1035 (53) 2368.94 1.00799 8.39 4.00    
1000 0900 2368.00 1039 (57) 2367.95 1.00799 7.39 3.00    
    2368.00 1041 (59) 2367.95 1.00799 7.39 3.00    
1000 1000 2366.10 1045 (63) 2366.05 1.00799 5.47 2.50    
    2366.12 1047 (65) 2366.07 1.00799 5.49 2.50    
1000 1100 2364.00 1050 (68) 2363.94 1.00799 3.35 2.00    
    2364.00 1053 (71) 2363.94 1.00799 3.35 2.00    
1000 1200 2362.58 1115 (93) 2362.50 1.00799 1.90 1.50    
    2362.58 1117 (95) 2362.50 1.00799 1.90 1.50    
1000 0000 2360.72 1142 (120) 2360.62 1.00799   0.00    
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recount the steps involved in gravity data reduction - latitude correction, free air correction and Bouguer correction

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identify and describe the uses of gravity methods in resource exploration

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