An earthquake generally produces which type of sound wave before the main shock wave begins?

Ultrasonic

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Infrasonic

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Audible sound

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Supersonic

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Solution

The correct option is B Infrasonic
Seismic waves are waves of energy that travel through the 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. The frequency of seismic waves can range from about $10^{- 3} H z$ to $50 H z$ .
Infrasonic waves are category of waves with frequencies less than 20 Hz. Almost all the seismic waves are infrasonic waves.

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