Name ________________________
Lab Section ___________________
EARTHQUAKE PRE-LAB ACTIVITY: Print out these pages and answer the questions using the information supplied in the pre-lab.
| 1. Each increase of 1 on the Richter Scale means an increase of ___________ times in the ground motion and about a _______ times |
| increase in the amount of energy released. |
2. The amount of energy released from the focus of an earthquake is called its:
3. Look at the following seismographs and determine the difference in arrival times between the P- and S- waves. Note the dots on the seismogram represent minutes.
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| Graph A | Graph B |
Graph A: __________ minutes Graph B: ___________ minutes
4. Which one of the above seismographs was located closest to the epicenter of this earthquake? A B (Circle your answer)
How did you determine your answer?
| 5. Fill in this chart with data from the http://neic.usgs.gov/neis/eqlists/eqstats.html as described in the pre-lab. For each year, write in the |
| magnitude of the most frequent earthquakes experienced worldwide and in the United States. NOTE: Ignore the category of "No Magnitude" on the chart. |
|
YEAR |
WORLDWIDE |
UNITED STATES |
| 1990 | ||
| 1991 | ||
| 1992 | ||
| 1993 | ||
| 1994 | ||
| 1995 | ||
| 1996 | ||
| 1997 | ||
| 1998 | ||
| 1999 |
Given the 10-year period in the chart above, answer the following questions:
6. What magnitude earthquake is most common worldwide? __________________
7. What magnitude earthquake is most common in the United States? __________________
8. What is the typical damage to be expected from the average earthquake? Refer to the chart of earthquake effects in the pre-lab
activity.
a. Worldwide ___________________________________________________________________
b. United States _________________________________________________________________
