Expain types of seismic waves
Answers
Answer:
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Explanation:
Earthquakes produce three types of seismic waves: primary waves, secondary waves, and surface waves. Each type moves through materials differently. In addition, the waves can reflect, or bounce, off boundaries between different layers.
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Types of wave
Seismic waves are fundamentally of two types, compressional, longitudinal waves or shear, transverse waves.
Through the body of the Earth these are called P-waves (for primary because they are fastest) and S-waves (for secondary since they are slower). However, where a free surface is present (like the Earth–air interface) these two types of motion can combine to form complex surface waves.
Although often ignored in introductory texts, surface waves are very important since they propagate along the surface of the Earth (where all the buildings and people are) and usually have much higher amplitudes than the P-waves and S-waves. It is usually surface waves which knock down buildings.
Seismic waves, like all waves, transfer energy from one place to another without moving material.