Seismic Waves GCSE Physics

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=CYMWpvY38z8

This video introduces seismic waves. There are two types of seismic waves, generated in earthquakes, and they are: Primary waves (P-waves) and secondary waves (S-waves). When we detect these seismic waves at stations around the world we can start to build up a picture of what lies beneath us. • Primary waves, which travel fastest, are longitudinal whereas secondary waves are transverse. Primary waves are detected at every point on Earth after an earthquake whereas secondary waves are not detected on the opposite side of Earth to where the earthquake originated. This is because below the Earth's crust, the Earth has a liquid layer: the mantle. The waves also refract as they cross boundaries of different densities. • Thanks for watching, • Lewis • Relevant for GCSE Physics 9-1 in the following exam boards: • AQA (including Trilogy) (Physics Higher only) • OCR A (Physics Higher only) • OCR B (Physics Higher only) • WJEC (Physics only) • _____________________________________ • MY PHYSICS WEBSITES • Find even more videos organised by exam board and topic at: • GCSE Physics Online • ► https://www.gcsephysicsonline.com • A Level Physics Online • ► https://www.alevelphysicsonline.com • MY YOUTUBE CHANNEL • Your support in watching this video has been invaluable! To contribute towards the free videos on YouTube, make a small donation at: • ► https://www.paypal.me/physicsonline • FOLLOW ME • ► https://www.youtube.com/physicsonline... • ► / physicsonline • ► / gcseandalevelphysicsonline • #waves #gcsephysics #physicsonline

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