Surface waves

Surface waves, is the most destructive. It seems to be in that has only produced two broadcast (with questions, the answer I'm not sure.)

2, say the scientists study the Earth's land for the internal structure of shock waves.

first: Scientists probing the Earth internal structure of shock sites, commonly used is the P wave, S wave. Aberdeen Scientists Under both wave propagation process of the Earth in the Earth's interior is divided into different layers.

second paragraph: S waves encounter the outer crust will be absorbed, and reflected P waves were bent.