Today in class we took a break from building our towers, and instead learned how to read seismograms! We first learned how to identify the arrival of p-waves, s-waves and surface waves on a seismogram. The p-waves always arrived first, and were the smallest, and then the s-waves arrived, and lastlythe surface waves (which were the largest). We then learned how to use the difference in the arrival times of the P and S waves to determine how far away from the epicenter of the earthquake the seismograph was. With using a graph depicting the amount of time it took for the s or p wave to travel a certain distance we were able to apply the time delay between the two waves to discover the seimograph's distance from the epicenter. We recieved a white packet called "reading seismograms" in class today so if you were absent make sure to pick one up.
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