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:

    1. intensity
    2. vulnerability
    3. magnitude

 

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. 

 

 

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://earthquake.usgs.gov/earthquakes/eqarchives/year/eqstats.php 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.  NOTEIgnore the category of "No Magnitude" on the chart. 
 
 

YEAR

WORLDWIDE

UNITED STATES

2000    
2001    
2002    
2003    
2004    
2005    
2006    
2007    
2008    
2009    
2010    

 

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 _________________________________________________________________