Question 17. Why do we feel body waves only as tremors?

问题17为什么体波只能让人们感到轻微的摇晃？

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Body waves, the fastest seismic waves, move through the earth.

体波是最快的地震波，可贯穿地球。

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There are two chief kinds of seismic waves: body waves and surface waves.

有两种主要的地震波：体波和面波。

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They wanted to body surf where the waves were breaking.

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There are two types one bounces electromagnetic waves off the body to create an image like this and the other uses backscatter technology to project low level X-ray beams over the body resulting in images like this.

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It involves mapping out the physics of how radiation waves travel through the body and interact with different biological substances.

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