Geophysics GPh3202: Electromagnetic Methods
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Questions and Answers

Electromagnetic methods are categorized into which two main categories?

  • Land-based and Airborne
  • Active and Passive (correct)
  • Electrical and Magnetic
  • Frequency-domain and Time-domain

    • What is the common measured parameter in Electromagnetic and Electric methods?

  • Electromagnetic waves
  • Frequency range
  • Electrical conductivity (correct)
  • Magnetic field

    • Which of the following is NOT a type of survey method used in Electromagnetic methods?

  • Marine
  • Land-based
  • Airborne
  • Space-based (correct)

    • In Frequency-domain Electromagnetic (FEM) methods, what is the relationship between the distance between the transmitter and receiver coils and the depth range under investigation?

    <p>Directly proportional</p> Signup and view all the answers

    What type of measurements can be conducted using Electromagnetic methods?

    <p>Mapping, profiling, and sounding</p> Signup and view all the answers

    In TEM, what is the level of inquiry closely correlated with?

    <p>Loop size, recording time interval, and shut-off time</p> Signup and view all the answers

    What is an advantage of EM methods over resistivity surveys?

    <p>Less sensitive to conductive uppermost layer</p> Signup and view all the answers

    What is a characteristic of EM methods that allows them to be used for a wider range of applications?

    <p>Does not require direct contact with the ground</p> Signup and view all the answers

    Which of the following is NOT an application of EM methods?

    <p>Weather forecasting</p> Signup and view all the answers

    What characteristic of EM methods allows them to be used in areas with highly resistive or conductive uppermost layers?

    <p>Ability to counter survey difficulties with land models</p> Signup and view all the answers

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