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Which of the following statements is correct regarding secondary seismic waves (S waves)? I. They are also called longitudinal waves. II. These waves cannot pass through liquid materials. III. Their speed is lower than surface waves.

Which of the following statements is correct regarding secondary seismic waves (S waves)? I. They are also called longitudinal waves. II. These waves cannot pass through liquid materials. III. Their speed is lower than surface waves. Correct Answer Only II

The correct answer is only II.

Key Points

  • Seismic waves are waves of energy that travel through Earth's layers and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions that give out low-frequency acoustic energy.
  • There are two types of seismic waves:
    • Body waves
    • Surface waves
  • Body waves travel within the body of Earth. They include;
    • P or Primary waves
    • S or Secondary waves
  • Secondary seismic waves (S waves) shake the ground in shearing, or crosswise, the motion that is perpendicular to the direction of travel.
  • These are the waves that move the ground up and down or from side to side.
  • S waves are called secondary waves because they arrive after P waves and travel only through solid materials.
  • S waves are also called longitudinal waves.
  • The speed of the S waves is generally lower than surface waves.

 Thus, we can say that Seismic Secondary waves (S waves) cannot move through liquid materials.

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