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P and S waves and evidence
Transcript of P and S waves and evidence
15th March 2016
To know the meaning of P and S waves
To know the link between theory and evidence.
To test our volcanoes
What is the HIGHEST volcano in the world?
How high is it?
Vibrations from an earthquake are categorised as P or S waves. They travel through the Earth in different ways and at different speeds. They can be detected and analysed.
P and S waves
P-waves (P stands for primary) arrive at the detector first. They are longitudinal waves which mean the vibrations are along the same direction as the direction of travel. Other examples of longitudinal waves include sound waves and waves in a stretched spring.
S-waves (S stands for secondary) arrive at the detector of a seismometer second. They are transverse waves which mean the vibrations are at right angles to the direction of travel. Other examples of transverse waves include light waves and water waves.
P andS waves