Lab: To be completed during Discussion (24 points total) 1. Using the P-S lagtime curve in Fig. 1 and the seismic wave arrival data given below from three different seismograms, calculate the distance in kilometers to the epicenter for the following earthquakes. (2 points each, 6 points total) If you are unfamiliar with so-called ?military time?, a time reported as 22:37?15? means: 22 hours (10pm), 37 minutes, and 15 seconds. P-S lagtime Distance (km) a. ?P? arrival at 22:37?15? 8: ?S? arrival at 22:38?16? b. ?P? arrival at 07:21?48? 8: ?S? arrival at 07:22?36? c. ?P? arrival at 15:18?23? 8: ?S? arrival at 15:19?39? 2. The Good Friday earthquake of March 27, 1964 produced a trace S-amplitude of 50 mm on a seismograph at Berkeley, California, 3000 km from the epicenter (Valdez, Alaska). Using the nomogram (Figure 2): a. What was the magnitude of the earthquake? (2 points) b. Given that the distance between the epicenter and Boston is 5500 km, what would the trace amplitude (in mm) have been had a seismometer been operating in Boston on that Good Friday? (2 points) c. The moment magnitude of this earthquake was recorded as 9.2. Why does this differ from the Richter Magnitude you determined above? (2 points)
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