Seismic Waves Chapter 15 Section 4.

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Presentation transcript:

Seismic Waves Chapter 15 Section 4

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

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

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

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.

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

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