Name: ___________________________________________ Period: ________ Date: _______________ Analyzing a Seismograph Earthquake Epicenter Data: ΔT (seconds) Distance (km) Ratio of D/ΔT (km/s) To calculate the distance from the epicenter, multiply the change in time by _________. Trial 1 Trial 2 Trial 3 Trial 4 Average → 1. In which seismogram is the time probe placed at the beginning of the P waves? 2. Which of the following has the two vertical probes in the proper positions to find the correct value for ΔT? A B C D 3. An earthquake has just occurred. Seismic waves from the earthquake are detected at two recording stations. At Recording Station A, ΔT = 45 s. At Recording Station B, ΔT = 100 s. Which recording station is farther away from the epicenter? A. B. C. D. A is farther from the epicenter than B. B is farther from the epicenter than A. A and B are the same distance from the epicenter. Cannot be determined. 4. Suppose that Recording Station N is located 200 km north of the epicenter of an earthquake, and Recording Station S is located 100 km south of the epicenter of the same earthquake. Which of the following statements would be true? A. B. C. D. At Recording Station S, the S wave would arrive before the P wave. The P wave would arrive at Recording Station N before it would arrive at Recording Station S. The value of ΔT at Recording Station N would be greater than ΔT at Recording Station S. The value of ΔT at Recording Station N would be less than ΔT at Recording Station S.

Analyzing a Seismograph

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