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James Olis

on 13 January 2015

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Transcript of Waves

We are all familiar with how
waves travel through water,
but waves also travel
through other materials,
including the entire
planet Earth!

Seismic Waves
Introduction Video
Compression Wave
A compression wave, also called a p-wave, is a wave where the molecules are pushed closer together (compressed) and then return to their original position when they expand.
P-waves are the fastes waves and are the first waves detected at earthquake sensors.
Wave Refraction
Waves travel at different speeds in different materials. Light waves and sound waves travel at different speeds through air and water. When you see a straw in a glass of water it looks bent, when you are swimming under water and someone outside the water yells, you can hear it, but not clearly.
Have you ever been riding in a car and the tires on one side of the car hit a puddle? You can feel the car pull to the side, just like waves, car tires travel at different speeds in different materials.
Slinky Comparison of P and S waves
Shear Waves
Shear waves are also S - waves and are like waves on a lake or ocean. S-waves are slower than P-waves and are the second wave you would feel in an earthquake. S-waves can travel through solid material, but not liquids.
S wave animation
You can see an S-wave animation here:
Shadow Zones
P - wave animation here:
The energy released by earthquakes travels through the earth in the form of waves. There are different typles of waves that are discussed in this presentation. Different waves travel at different speeds and not all waves can travel through all materials.
Full transcript