The presentation of geophysical data is something considered unavoidable, especially for either if you are a geophysicist, geologist or anyone who should deal with this part in a geophysical project. Yes! It is unavoidable as there must come a time during your work when you should present your geophysical findings either for the purpose of geophysical survey, interpretation or in writing your final geophysical report. However I want to make clear that this talk is intended for that representation in geophysical data as used in data collection. Although you can utilize these ways when making presentations for your data. And this is why I have produced this post so as it can assist you to understand how you can do this in a meaningful and authentic way.
Let us be together until the end of this talk. Stay attentive!
Geophysical data can be presented in many forms, however all these forms are based on two (2) ways as described here below,
Mapping
When we are talking about a map, the first thought come into your mind is about three parameters such as x, y, z. At which (x,y) can be either location or any other pre-referenced parameter. While the z values would represent any other geophysical parameter such as magnetic intensity, bouguer anomaly or geological parameter such as Dip angle or any numerical parameter such as topographic like elevation, depth, physical such as temperature, even concentration of certain radioelements if it is in case of radiometric survey. This is a term simply used to mean a map. I have to be specific that mostly applied are grid-based maps for example those of contour, relief, surface maps.
Radiometric data can be presented in composite color maps with Red, Blue and Green primary colors used to present the distribution of radioelements such as Potassium (K), Uranium (U), and Thorium (Th) respectively. See the figure 1 below
Figure 1: A simple composite color Map for radioelements.
Also the geophysical data such as gravity bouguer anomaly can be represented as bouguer anomaly contour map as seen in the figure 2
Figure 2: A bouguer anomaly map, Contour interval 50g.u
Profiling
This form simply applies to geophysical data collected in two dimensions (2D), such as a certain geophysical parameter varies laterally along a predefined profile. It is the same as the presentation of coordinates in the xy - cartesian plane, meaning that the magnitude of such a geophysical parameter is presented against a certain horizontal distance. Let us see for example in Ground based magnetic surveys, magnetic profiles will display intensity of magnetic against the horizontal distance. Also variation of gravity along a horizontal distance as that of bouguer anomaly profile see the figure 3 below, representing profiling A-A' of figure 2.
Figure 3: Bouguer Anomaly Profile A-A'
Also in Electrical Resistivity, you can plot the apparent resistivity values against the electrode configuration distance (spacing) as shown in the figure 4 below.
Figure 4 :Resistivity traversing profile across a mineshaft
The same way in Electromagnetic (EM) the Dip - angle can be plotted against the lateral distance (see figure 5). Also GPR profiles, seismic profiles just to mention a few.
Figure 5: Tilt - angle profile using two different frequencies (Telford et al, 1990).
All in all presenting a geophysical data is very important because it gives us the visual impression or pattern variation of our geophysical data, which can tell us the hidden image of the subsurface geology . Also it allows other necessary actions such as follow up to be done in an authentic way.
Wishing you a happy Presenting of your geophysical data.
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