“Visualizing Seismic Wave: P wave and S wave “is updated on our youtube ERI channel

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When earthquake happens, P-wave (Primary wave : a relatively small vertical wave) reaches first, and then S-wave (Secondary wave: a larger horizontal wave) reaches. EEW (Earthquake Early Warning System),uses this time lag to detect when the S wave (stronger shake) arrives. Let’s have a look into P-wave and S-wave by creating your own earthquake wave experimental model.