Raw data: DC resistivity

These questions check your understanding of how to inspect raw DC resistivity data sets for quality and likely information content. Print this page so that you can sketch answers on the figures. Even in black and white the figures can be used for your answers. Hand in the page for marking if required.


Questions

NOTE: Click here for a reminder of how pseudosections are generated. Hand in the page for marking if required.

  1. Circle and identify portions of lines "Calcine 1" and "Calcine 3" for which data points were deleted owing to bad recordings.
  2. On line "Calcine 2", identify a diagonal stripe of 7 data points which have rather different values from their neighbours. These might be less reliable values than those which vary more smoothly.
  3. Vertical axis are not labelled. What "units" should be applied, and does this represent true "depth"?
      
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  4. Are the values that are plotted true representations of the earth's physical property at any location? Circle Yes or No.
  5. Explain your choice.
      
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  6. Is there evidence of structure that varies both laterally and vertically? Circle Yes or No.
  7. Explain your choice.
      
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Resistivity pseudosections

East West



East West



East West
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