3. What is the distance between the epicenter and the station for the earthquake

Question

3. What is the distance between the epicenter and the station for the earthquake recorded on the seismogram in figure 6.2?
4. For the earthquake recorded in figure 6.2, about how long did it take for the first P wave to reach the station: 3,6, or 14 minutes? ( Hint: Use the travel- time graph in figure 6.4 to answer this question.
5. If the first p waves was recorded at 10:39 pm local time at the station in figure 6.2, what was the local time when the earthquake occurred? ________________ pm local time

the farther a station is from the epicenter. TRAVEL-TIME GRAPH Distance in kilometers 1000 2000 4000 17 16 15 14 13 12 S-wave curve 10 9 8 6 P-wave curve 5 2000 2500 1000 1500 500 Distance in miles from epicenter

Explanation / Answer

Q3. From the fig 6.2, we calculate the time lag in between 1st P wave and 1st S wave. From the fig 6.1, we determine the distance( with the help of time lag from fig 6.2) in between epicentre and station is 1900 miles.

Q4. 1st P wave takes 6 minutes to reach surface.

Q5.As 1st P wave takes 6 minutes to reach surface, so the earthquake occured on 10:34 pm.

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