1. Primary Waves (P-waves):

- Fastest type of seismic wave.

- Compressional waves: they travel by squeezing and expanding the material they pass through, similar to sound waves.

- Can travel through solids, liquids, and gases.

- Cause the ground to move back and forth in the direction the wave is traveling.

2. Secondary Waves (S-waves):

- Slower than P-waves.

- Shear waves: they travel by causing particles to move perpendicular to the direction of the wave.

- Can only travel through solids.

- Cause the ground to move side to side perpendicular to the direction the wave is traveling.

3. Surface Waves:

- Slowest type of seismic wave.

- Travel along the Earth's surface.

- Two main types:

- Love waves: cause horizontal shaking, similar to S-waves but confined to the surface.

- Rayleigh waves: cause a rolling motion, like waves on the ocean surface.

- Cause the most damage during earthquakes.

These waves are generated during earthquakes and other seismic events, and they are used by seismologists to study the Earth's interior and to monitor seismic activity.