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

Ultrasound

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Infrasound

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Audible sound

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None of the above

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Solution

The correct option is B Infrasound
Earthquake is a movement of tremor of the earth's crust. It originated naturally and below the surface. An earthquake produces infrasound before the mainshock wave begins. Infrasound is low-frequency sound less than 20hz. It can travel hundreds of km through the earth's surface. So by detecting this sound, we can predict an earthquake.

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