Secondary Waves Can Travel Through All Areas of Earth Except the
Seismic waves
Earthquakes produce shockwaves called seismic waves. These waves can be detected using seismographs. Some seismic waves are surface waves, while others can travel through the Earth.
P and Due south waves' paths through Earth
The speed of P waves and S waves increases every bit they travel deeper into the Globe's pall .
They travel through the Earth in curved paths, but they change direction suddenly when they pass through the boundary between substances in different states.
The diagrams show what happens when P waves and Due south waves laissez passer through the Earth.
P waves
- Longitudinal
- Fast moving
- Travel through liquids and solids
S waves
- Transverse
- Slower moving than P waves
- Travel through solids but
S waves cannot pass through the liquid outer core, just P waves tin can. The waves are refracted as they travel through the Earth due to a alter in density of the medium. This causes the waves to travel in curved paths. When the waves cross the boundary between two dissimilar layers, there is a sudden change in management due to refraction.
- Question
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Compare the properties of P waves, Due south waves and surface seismic waves.
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A surface wave travels forth the surface of the Globe. It is the slowest of the three types of seismic wave. Surface waves usually accept larger amplitude than the other waves and cause the most harm.
A P wave is a longitudinal moving ridge and travels the fastest. It tin can travel through solids and liquids.
An S wave is a transverse wave and travels slower than a P moving ridge, thus arriving after the P wave. S waves can only travel through solids, and as a consequence do not travel through the liquid core of the Earth.
Source: https://www.bbc.co.uk/bitesize/guides/zswkjty/revision/3
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