BELL RINGER 5-3-10 1. What is it called when waves bend as they go from one type of medium to the other?  What is it called when waves bend around a.

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Presentation transcript:

BELL RINGER What is it called when waves bend as they go from one type of medium to the other?  What is it called when waves bend around a corner or through an opening?  What is it called when waves bounce back from a surface because they are unable to travel through it?  Write an example of reflection.  Write an example of refraction.

Chapter 15 Section 4 Seismic Waves

Seismic Waves  These waves travel through rock, and provide an effective way to "see" events and structures deep in the Earth.  The word seismic comes from the Greek word “seismos” which means earthquake.  Seismic Wave = Earthquake Wave

Three basic types: 1. P-waves 2. S-waves 3. Surface waves

1. P waves  P-waves, or Primary waves, travel the fastest and are longitudinal waves. They are made up of compressions and rarefactions.  They can move through both liquids and solids.

2. S waves  S-waves or secondary waves, are transverse waves that travel slower than P-waves.  They can travel through solids but not liquids.

3. Surface waves  Surface waves travel along the outer surface of the earth at slower speeds than P and S waves.  Particles move in rocks like waves would move in water, in a circular motion.  They cause most of the destruction during an earthquake. These waves consist of longitudinal and transverse waves (side-to-side and up- and-down motions).

 The 3 types of seismic waves The 3 types of seismic waves The 3 types of seismic waves

 A seismograph is an instrument scientists use to detect earthquakes.  A seismograph records the ground movements caused by seismic waves as they move through Earth.

 A tsunami is an underwater earthquake.

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