On map 1 there are three different seismograph stations named A, B, and C. there
are also three areas marked with an X that correspond to the distance from each
station that the epicenter was determined to be.
2. Place the compass point on station A and set the pencil point on the area AX.
Using the compass draw an arc or circle (whatever fits) around A. Repeat this
procedure with B and BX and C and CX.
3. Circle and highlight the area where all the lines intersect. This corresponds to the
epicenter. You may not have them all together exactly but the closest you come
will indicate your epicenter. Remember there is only one epicenter per
earthquake. There is only one epicenter in any given earthquake.
4. Repeat this procedure for maps 2 and 3. These are two more earthquakes.
5. Answer the analysis questions.
What do the areas indicated by X (AX, BX, CX) represent?
Explain how this information is usually obtained. Include recording station
usefulness and how many are used.
How many recording stations would give the best information? Is there a set
number or can it vary?
Should seismograph stations be located only near fault zones? Why or why not?