A typical earthquake produces two types of seismic waves. P (“primary") seismic waves are longitudinal waves that move t

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A Typical Earthquake Produces Two Types Of Seismic Waves P Primary Seismic Waves Are Longitudinal Waves That Move T 1 (182.94 KiB) Viewed 39 times

A typical earthquake produces two types of seismic waves. P (“primary") seismic waves are longitudinal waves that move through the earth's upper crust at about 3 km/s to 5 km/s (depending on the crust composition). S (“secondary") waves are transverse waves that move about 60% slower. An observer with a seismograph can distinguish between these types of waves. If an observer receives the P waves from an earthquake about 12 s before the S waves, roughly how far is the observer from the epicenter? (Give an approximate range.)