When a earthquake happens, it generates siesimic waves. There are three type of waves which are Primary waves (P-waves), Second waves (S-waves) and surface waves. they are all diffrent and very in speed and destruction power.

Primary Waves- The fastest waves of the three, thus it gets its name "prime" it moves in a forward motion. it moves faster through solid than liquid but can travel through both. This wave is not very destructive. This wave can go on past the other side of the earth from the Epicenter.

Secondary Waves- Slower than primary waves, this wave moves from side to side like a snake. It can only move through solid. This wave is not very destructive.

Surface Waves- The slowest wave of the three, it has the most destructive power because it can move like both a second wave and a prime wave at the same time. This wave is the main reason why buildings fall and cause much damage.