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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