Seismic Waves
Published on Nov 25, 2015
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Seismic Waves
By: Sve Chang
What are seismic waves?
Seismic waves are waves of energy that travel through the Earth's layers, and are a result of an earthquake, explosion, or a volcano that gives out low-frequency acoustic energy. Many other natural and anthropogenic sources create low-amplitude waves commonly referred to as ambient vibrations.
The wavelength of a seismic wave.
The wavelength (λ) is the distance between two adjacent points on the wave that have similar displacements, one wavelength is the distance between successive crest.
The frequency of a seismic waves.
The cycle of seismic waves or repetitions in a given unit of time is called frequency (f). Frequency and period are related by a relationship.
Seismic waves harmful.
Seismic waves are harmful because they cause earthquakes and if the earthquakes has a great magnitude they can cause a tsunami.
The history of seismic waves.
Before scientific studies began, ideas about earthquakes were largely based on myth and superstition.
How do seismic waves work?
There are two fundamentally different types of seismic waves that are surface waves and body waves.
Body Waves
Body waves are the most interesting because they move the fastest, and they are also the waves that are used to figure out the structure of the earth, body waves come in two varieties P waves or S waves (primary or secondary) these are actually energy that are being transferred through a body so it’s not just moving along the surface of one.
P- waves can travel through air, liquid, and they can travel through solid. On air they will travel the slowest, they will essentially move at the speed of sound, 330 meters per seconds. On liquid they move about 15,000 meters per seconds and then on solid 5,000 m/s.
In an earthquake were to happen you would see the P waves first and then 60% of the speed of the P waves you would see the S-waves. S waves can only through solid.
P- waves can travel through air, liquid, and they can travel through solid. On air they will travel the slowest, they will essentially move at the speed of sound, 330 meters per seconds. On liquid they move about 15,000 meters per seconds and then on solid 5,000 m/s.
In an earthquake were to happen you would see the P waves first and then 60% of the speed of the P waves you would see the S-waves. S waves can only through solid.
Surface Waves
Surface waves can be rayleigh wave that basically move up and down. Love waves are essentially the ground shifting left and right, in both cases the movement of the surface wave is perpendicular to the direction of motion, they are sometimes called transverse wave.
How do seismic waves benefit society.
They don't benefit society because they cause destruction, but when an earthquake (that is a seismic wave) occurs it realises the built up deep in the earth and also creates islands and mountains.
Works Cited
- Works Cited
"Animals predicts the earthquake." Personal.PSU. SHUQI MAO, 6 Dec. 2012. Web. 16 June 2015.
