12.3 Discovering Earth's Layer
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What does reflection mean?
The redirection of some waves back to the surface when seismic waves hit a boundary between different Earth materials
What does refracted mean?
A change in direction of waves as they enter shallow water. The portion of the wave in shallow water is slowed, which causes the waves to bend and align with the underwater contours
What is the shadow zone?
The zone between 105 and 140 degrees from an earthquake epicenter. Direct waves do not penetrate the shadow zone because of refraction by Earth’s core.
What are P-Waves?
There are waves that can go through liquid and solid
What are S-Waves?
There are waves that can only go through solid
What is the P-wave shadow zone?
Between 100 to 140 degrees where no direct P waves are recorded
What is the S-wave shadow zone?
Between 100 to 100 on the other side were weak diffracted S waves are found