Name ____________________ Internet Lab-Earthquakes Address: http://www.sciencecourseware.com/VirtualEarthquake/VQuakeExecute.html Follow the instructions for locating the epicenter and determining the magnitude for an earthquake. Green colored boxes take you to the next page in the assignment. Read the descriptions on each page before going to the next page. Answer the following questions using the web pages. At what speeds do S-waves travel? P-waves? List the 4 main parts of a seismogram: How many seismic stations need to be examined to locate an epicenter of an earthquake? CHOOSE A REGION AND GO TO THE NEXT PAGE What do you need to do to locate the epicenter of this earthquake? GO TO THE NEXT PAGE Record your 3 measurements here: (Be sure to type your answers in the boxes on the screen) a. ___________ seconds b. ___________ seconds c. ___________ seconds GO TO THE NEXT PAGE How long does it take an S-wave to travel 300 km? A P-wave? Record your 3 epicenter distances here: (Be sure to type your answers in the boxes on the screen) a. ____________ km b. ____________ km c. ____________ km GO TO THE NEXT PAGE If your measurements were correct, go to the next page. If not, click on “View the true Epicenter” to see where your numbers were incorrect. What city was nearest the epicenter for this earthquake? Compute Richter Magnitude: Who introduced the Richter Scale? What is magnitude? Richter magnitude is determined using what two measurements? GO TO THE NEXT PAGE How much is the maximum amplitude of an earthquake increased with one unit of magnitude? GO TO THE NEXT PAGE Record your measurements for S-wave amplitude: (Be sure to enter your answers on screen) a. ___________ b. ___________ c. ___________ GO TO THE NEXT PAGE Record your estimate of Magnitude ___________ GO TO THE NEXT PAGE How close was your estimate? What was the actual magnitude?