Finding the Epicenter

How far from an earthquake epicenter is a city where the difference between the P-wave and S-wave arrival times is 6 minutes?

• 900 miles

• 2,000 miles

• 2,500 miles

• 2,700 miles

Which seismic station is furthest from the epicenter of the earthquake?

• A

• B

• C

Which seismic station is closest to the epicenter of the earthquake?

• X

• Y

• Z

How many possible epicenter locations would you have if you had the distance from one seismograph station to the epicenter?

• Infinite

• 1

• 2

• 3

How many possible epicenter locations would you have if you had the distance from two seismograph stations to the epicenter?

• Infinite

• 1

• 2

• 3

Where is the epicenter located?

• C

• D

• E

• G

How many circles are needed to determine the epicenter of an earthquake?

• 1

• 2

• 3

• 5

What is the minimum number of seismograph stations needed to accurately determine the epicenter of an earthquake?

• 1

• 2

• 3

• 4

If the P-wave arrives 4 minutes before the S-wave at a seismograph station, approximately how far is the epicenter from the station?

• 400 miles

• 800 miles

• 1,200 miles

• 1,600 miles

Which of the following best describes the process of triangulation in finding an earthquake's epicenter?

• Using one seismograph to measure wave intensity

• Using two seismographs to calculate distance

• Using three seismographs to pinpoint location

• Using four seismographs to confirm data