1. Seismic Waves
Chapter 15 Section 4

2. Seismic Waves
The waves produced by earthquakes are called seismic waves.
There are 3 types of seismic waves:
P waves
S waves
Surface waves

3. P waves Some seismic waves are longitudinal waves.
Longitudinal seismic waves are known as P waves, or primary waves.

4. S waves
Transverse seismic waves are known as S waves, or secondary.

5. Surface Waves
A surface wave is a combination of a longitudinal wave and a transverse wave that travels along the surface of a medium.
Surface waves produced by
earthquakes move more
slowly than P waves and
S waves.

6. Tsunami
A tsunami is a huge surface wave on the ocean caused by an underwater earthquake.

9. Detecting Seismic Waves
A seismograph is an instrument used to detect and measure earthquake waves.