Name:___________________________________
Name:___________________________________
Period:_____________
Finding Epicenters
Complete the chart below using your knowledge of Earth Science and your Earth Science Reference Tables. Please note that stations A, B, and C are picking up a different earthquake than stations 1, 2, and 3.
|seismograph station |Arrival (clock time) |Difference in arrival time |Distance to epicenter |"P" Wave travel time|Time of origin |
| | |(min. & sec.) |(km) | |(hr, min, & sec) |
| | | | |(min. & sec.) | |
| |"P" Wave |"S" Wave | | | |
| |"P" Wave |
|Louisville |[pic] |
|Pittsburgh |[pic] |
|seismograph station |Arrival (clock time) |Difference in arrival time |Distance to epicenter |
| | |(min. & sec.) |(km) |
| |"P" Wave |"S" Wave | | |
|New York | | | | |
|Louisville | | | | |
|Pittsburgh | | | | |
Additional Questions
1. What is the difference in arrival times of seismic waves at a seismic station 6,200km away from the epicenter of an earthquake?
2. (a) If the earthquake occurs at 9:20 am, what time will a seismic station 2,600km away pick up the P-wave?
2. (b) What time will it pick up the S-wave?
3. How many seismic stations are need to identify the epicenter of an Earthquake?
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Sample Seismogram
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