UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Overall, both P waves and S waves would INCREASE in speed
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Overall, both P waves and S waves would DECREASE in speed
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P waves would DECREASE in speed and S waves would disappear
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P waves would INCREASE in speed and S waves would DECREASE in speed
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Detailed explanation-1: -Seismic waves travel faster in denser rocks; temperature tends to lower the speed of seismic waves; and pressure tends to increases the speed.
Detailed explanation-2: -Seismic waves speed up as they go through more rigid materials. So they slow down if the material is less rigid and speed up if it’s more rigid.
Detailed explanation-3: -Seismic waves travel faster through hard rock than through softer rock and sediments like soil and sand. But as the waves pass from harder to softer rocks, they slow and their strength increases, so shaking is more intense where the ground is softer.
Detailed explanation-4: -For example, the denser a material is, the faster a seismic wave travels (SF Table 7.1). P waves can travel through liquid and solids and gases, while S waves only travel through solids.