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Geophysical methods - Coggle Diagram
Geophysical methods
Seismic
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utilised in many applications for subsurface investigations,
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9-Analysing the time that the soundwaves take to return provides valuable information about rock type
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7-geophones record the time taken by direct waves, reflected waves and refracted waves
Radiometric
Radiometric surveys are an airborne method which measures the amounts of natural radiation produced at the Earth's surface.
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4-through atmosphere, these rays can penetrate up to a couple of hundred metres
7-infer rock types such as granite and zones within rocks that may have been altered by metal-rich fluids passing through
3-gamma radiation only being able to penetrate several centimetres of earth, the radioactive materials must be present in outcrops to be detected.
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2-producing relatively high amounts of radiation which can be measured in contrast to the surrounding rocks
9-instruments themselves do not emit any radiation, making them harmless to both people and livestock.
1-Radioactive uranium, thorium and potassium minerals occur naturally in rocks