What Can We Learn From Seismic Waves?

What Can We Learn From Seismic Waves?D24Seismograph stations can give us information about earthquakes.Time lag Is the time difference between the arrival of the two wavesTells how far away you are from the epicenter, NOT the direction of the earthquake

Determining how far away an earthquake happens

P Waves show up on seismograph first, then S WavesNear the epicenter, the time lag is shortFurther away, the time lag is longer

How scientists find the epicenter of an earthquakeDraw a circle around the station.The epicenter can be anywhere in that circle. Contact two other seismograph stations and find the lag time noted at each station.Lag time tells how far the epicenter is from each station.Draw a circle around each place and the epicenter is the point where all three circles come together.Finding the epicenter of an earthquake

Seismograph stations can be found all over the world.