# Geology Labs Online: Virtual Earthquake http://www

```Geology Labs Online: Virtual Earthquake
http://www.sciencecourseware.org/virtualearthquake/vquakeexecute.html
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Why do P waves get recorded first on a seismograph?
How would you calculate the S-P interval?
What is the S-P interval in the sample picture?
How many seismograms are needed to determine the epicenter of an earthquake?
Pick an Earthquake: ____________________________
Record your three S-P intervals in the table below:
Use the graph to determine the distance from the epicenter, complete the chart below:
Recording Station
S-P Interval
Distance
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Did you predict correctly?
Click on View True Epicenter: What did you do wrong?
How do we measure how strong an earthquake is?
What does magnitude refer to on a seismograph? (What two measurements are needed?)
Record the amplitude of the S waves at the three recording stations:
Recording Station
Amplitude
13. What is the Magnitude of your earthquake?
14. Were you correct? If not, where did you make a mistake?
15. Complete final tabulation of data and send to me at Christy.kunkle@cms.gaggle.net
Repeat for another one of the earthquakes:
16. Pick an Earthquake: ____________________________
17. Record your three S-P intervals in the table below:
18. Use the graph to determine the distance from the epicenter, complete the chart below:
Recording Station
S-P Interval
Distance
19. Did you predict correctly?
20. Click on View True Epicenter: What did you do wrong?
21. Record the amplitude of the S waves at the three recording stations:
Recording Station
Amplitude
22. What is the Magnitude of your earthquake?
23. Were you correct? If not, what did you do wrong?
24. What did you learn about accuracy in measurement today? Why is it so important????
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