Geophysics 1: Magnetic and Seismic Surveys
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Questions and Answers

What is the degree to which a substance/material may be magnetized?

  • Magnetic field
  • Magnetic force
  • Magnetic susceptibility (correct)
  • Magnetic permeability

    • Which geophysical method detects buried dense bodies, unconformities, and faults?

  • Magnetic survey (correct)
  • Gravity survey
  • Seismic survey
  • Radiometric survey

    • Which wave is used to map geologic structure or rock formations in seismic survey?

  • Primary wave (correct)
  • Tail wave
  • Secondary wave
  • Head wave

    • What is a measure of the natural radiation in the earth’s surface, which can tell us about the distribution of certain soils, alteration, and rocks?

    <p>Radiometric (B)</p> Signup and view all the answers

    What is the reciprocal of conductivity?

    <p>Resistivity (B)</p> Signup and view all the answers

    Which type of magnetic behavior is exhibited by magnetite?

    <p>Ferromagnetic (D)</p> Signup and view all the answers

    Which geophysical measurement technique can be applied to explore near surface underground structures?

    <p>Ground Penetrating Radar (A)</p> Signup and view all the answers

    What property represents the resistance of material having specific dimensions with an SI unit of Ohms meter?

    <p>Resistivity (A)</p> Signup and view all the answers

    Which one is not calculated in DC (Direct Current) resistivity survey?

    <p>None of the above (D)</p> Signup and view all the answers

    IP is a type of electrical geophysical method. What does IP stand for?

    <p>Induced Polarization (C)</p> Signup and view all the answers

    IP survey is the most effective method of searching for ___________

    <p>Porphyry Copper deposits (A)</p> Signup and view all the answers

    What type of IP (Induced Polarization) instrument injects electrical current to the ground in order to identify chargeability of the subsurface?

    <p>IP Transmitter (B)</p> Signup and view all the answers

    What does the IP method measure to identify the properties of the subsurface?

    <p>Chargeability (A)</p> Signup and view all the answers

    What is the proportionality factor relating to the current that flows in a medium to the electric force field that is applied?

    <p>Electrical conductivity (D)</p> Signup and view all the answers

    What is the reciprocal of conductivity?

    <p>Resistivity (A)</p> Signup and view all the answers

    It is a physical property related to conductivity. We use this kind to characterize the formation and strength of the induced polarization within a rock, under the influence of an electric field.

    <p>Chargeability (A)</p> Signup and view all the answers

    Flashcards

    Magnetic susceptibility

    The degree to which a substance can be magnetized.

    Magnetic survey

    A geophysical method detecting buried dense bodies, unconformities, and faults using magnetism.

    Primary wave

    The wave used in seismic survey to map geologic structure.

    Radiometric

    Measuring natural radiation in Earth's surface to study soil, alteration and rocks.

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    Resistivity

    Resistance of a material to current flow (Ohms meter).

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    Ferromagnetic

    The magnetic behavior of magnetite.

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    Ground Penetrating Radar

    Geophysical technique exploring near-surface underground structures.

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    Resistivity (property)

    A material's opposition to electrical current flow. Measured in Ohms meter.

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    Induced Polarization (IP)

    Electrical geophysical method.

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    Porphyry Copper deposits

    A type of mineral deposit that can be found using an IP survey.

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    IP Transmitter

    IP instrument injecting current to ground to identify subsurface chargeability.

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    Chargeability

    A property characterizing polarization within a rock under an electric field.

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    Electrical conductivity

    Measure of how easily current flows through a material.

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    Reciprocal of conductivity

    Resistivity, a measure of resistance of a material.

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    Chargeability (property)

    Physical property related to induced polarization of a rock, under the influence of an electric field.

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    Study Notes

    Magnetic Susceptibility

    • A measure of how easily a substance can be magnetized.

    Gravity Method

    • Detects buried dense bodies, unconformities, and faults.

    Seismic Reflection Waves

    • Used to map geologic structures or rock formations in seismic surveys.

    Radioactivity

    • A measure of natural radiation in the Earth's surface.
    • Provides information about the distribution of certain soils, alteration, and rocks.

    Resistivity

    • The reciprocal of conductivity.

    Ferromagnetism

    • The type of magnetic behavior exhibited by magnetite.

    Ground Penetrating Radar (GPR)

    • A geophysical measurement technique used to explore near-surface underground structures.

    Resistivity

    • Represents the resistance of a material with specific dimensions.
    • The SI unit of resistivity is Ohms meter.

    Depth

    • Not calculated in DC (Direct Current) resistivity surveys.

    Induced Polarization (IP)

    • IP is a type of electrical geophysical method.
    • Most effective for searching for mineral deposits.

    Chargeability Instrument

    • Injects electrical current into the ground to identify the chargeability of the subsurface.

    Chargeability

    • Measured by the IP method to identify the properties of the subsurface.

    Conductivity

    • The proportionality factor relating the current flowing in a medium to the applied electric force field.

    Resistivity

    • The reciprocal of conductivity.

    Chargeability

    • A physical property related to conductivity.
    • Characterizes the formation and strength of the induced polarization within a rock under the influence of an electric field.

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    Description

    Test your knowledge of geophysics with this quiz covering magnetic permeability, gravity surveys, seismic surveys, and wave detection. Explore the principles behind the detection of buried bodies, unconformities, faults, and geological structures.

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