EARTH SCIENCE
EARTHQUAKES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A small earthquake that follows the main earthquake.
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A type of seismic wave that pushes and pulls rocks in the direction that the wave is traveling.
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A type of seismic wave that shakes particles perpendicular to the direction that the wave is traveling.
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A seismic wave that travels along Earth’s surface.
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Detailed explanation-1: -The answer is shear waves. Remind them that in shear waves particles of material move back and forth perpendicular to the direction in which the wave itself moves. S-waves (S stands for secondary) are shear earthquake waves that pass through the interior of the Earth.
Detailed explanation-2: -S-waves, also known as secondary waves, shear waves or shaking waves, are transverse waves that travel slower than P-waves. In this case, particle motion is perpendicular to the direction of wave propagation.
Detailed explanation-3: -The P wave propagates at 6 km/sec in rock with particle motions that are parallel to the direction of propagation. The S wave is slower at 4 km/sec and propagates with particle motions that are perpendicular to the direction of propagation.
Detailed explanation-4: -(ii) S-waves (shear wave, secondary wave, or transverse wave): The particles vibrate perpendicular to the direction of the wave propagation. The vibration shakes horizontally and the velocity of the S-waves is next to that of the P-waves as they pass through the same medium.
Detailed explanation-5: -S-waves can only move through solids. This is because liquids and gases don’t resist changing shape. P-waves and S-waves are the two types of body waves.