10.2 RSG Locating and Measuring Earthquakes pgs. 217 – 221
Name
Date
Score
Before you read define the Key terms from the section NOT from glossary:
1. Seismograph –
2. Seismogram –
3. Magnitude –
After you read answer these key concept questions in
COMPLETE SENTENCES:
4. – 5. Create a Venn diagram that explains the difference between a seismograph and a
seismogram using the following phrases: the instrument, the record sheet, used to detect
earthquakes, indicates arrival times of each type of wave, consist of a weight, pen and rotating
drum.
6. – 7. If the difference in the time of arrival of P and S waves increases, the distance to the
epicenter of the earthquake is (increasing / decreasing). Explain why?
8. Why is it essential to have data from more than 1 seismograph station to locate an
earthquakes epicenter?
9. – 10. Use the graph on page 218 to answer the following. (A) If the difference between P
and S wave arrival times is 3 minutes and 45 seconds, what is the distance to the Collinsville
station to the epicenter. (B) A station in Chapel Hill, North Carolina records data from the
same earthquake. Chapel hill is 3000 km from the epicenter. What is the difference in P and S
wave arrival times for this station?
A. ________________________
B._________________________
11. Explain what is meant by magnitude of an earthquake.
12. List and describe two scales used to measure an earthquakes magnitude.
(Bonus 2pts) Suppose an earthquake has a Richter magnitude of 3 and a second earthquake a
Richter magnitude of 7. How many times more powerful is the magnitude 7 than the magnitude
3. Show all math work!!!