Because P waves are the fastest seismic waves, they will usually be the first ones that your seismograph records. The next set of seismic waves on your seismogram will be the S waves. These are ...

Distances from the stations to the earthquake are estimated from the difference between P and S wave arrival times: You have just figured out how far your seismograph is from the epicenter and how ...

The Yellowstone Seismic Network is designed to record ground shaking due to earthquakes. But earthquakes aren’t the only ...