GCSE Physics 9-1: Seismic Waves: Distance Calculations

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Lesson Objectives: To be able to understand that the distance travelled by a P-wave is the same as the distance travelled by an S wave, to the location of an earthquake. To be able to calculate the distance travelled using the time interval between the P and S waves.

Ensure you have a basic understanding of what seismic waves are before watching this video. Make sure that you understand that there is a time delay between the P and S waves arriving. In this video we talk about how the distance travelled is the same for both P and S waves. We then derive a mathematical expression incorporating the time delay and we use it to find the distance. This is a tricky concept so make sure that you pause the video as required.

Comment below if you get stuck – I will do my best to answer all queries
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[najmallayl]

hi sir, why don't you divide the final answer of 1870000 by 2,
because isn't the distance that we get the whole distance to the earthquake and back , so we have to divide by two to just know the actual distance to the earthquake