In this activity, you will be going to the "Virtual Earthquake" website where you will be doing a series of guided tasks related to locating the epicenter and determining the magnitude of an earthquake.  Print out or otherwise have these activity questions available to you before you click on the link below.URL:  http://www.sciencecourseware.com/VirtualEarthquake/VQuakeExecute.htmlChoose the region “San Francisco area” for your simulation of an earthquake and click “submit choice”. What does the S-P interval represent exactly?  Choose the best answer below:Select one:a. It means you can measure the distance the waves have traveled.b. It is the time interval between the arrival of the P-wave and the arrival of the S-wave at a seismic station.c. It is the distance between the earthquake epicenter and the seismic station.d. It represents the earthquake itself.InformationFlag questionInformation textClick on “View Seismograms” at the bottom of the page.  Choose the closest number that represents the S-P interval you got for each station (Questions 4, 5 & 6) below:Question 4Answer savedPoints out of 2.0Flag questionQuestion textEureka, CA:Select one:a. 49 secondsb. 28 secondsc. 17 secondsd. 98 secondse. 240 secondsQuestion 5Answer savedPoints out of 2.0Flag questionQuestion textElko, NV:Select one:a. 22 secondsb. 55 secondsc. 72 secondsd. 102 secondse. 538 secondsQuestion 6Answer savedPoints out of 2.0Flag questionQuestion textLas Vegas, NV:Select one:a. 54 secondsb. 40 secondsc. 64 secondsd. 84 secondse. 162 secondsQuestion 7Answer savedPoints out of 4.0Flag questionQuestion textClick on “Convert S-P Interval”.  Read the information on “Determining the Earthquake Distance”. It takes an S-wave approximately 70 seconds to travel 300 km.  How long does it take the P-wave to travel this same distance?  Choose the best answer belowSelect one:a. 70 secondsb. 540 kmc. 39 km/sd. 39 secondse. 520 kmInformationFlag questionInformation textUse the S-P graph at the bottom of the webpage and the estimates you made for the S-P travel times for the three seismograms.  Choose the closest number that represents the closest distance in the space below:Question 8Answer savedPoints out of 2.0Flag questionQuestion textEureka, CA:Select one:a. 501 kmb. 302 kmc. 478 kmd. 355 kme. 203 kmQuestion 9Answer savedPoints out of 2.0Flag questionQuestion textElko, NV:Select one:a. 740 kmb. 504 kmc. 579 kmd. 703 kme. 520 kmQuestion 10Answer savedPoints out of 2.0Flag questionQuestion textLas Vegas, NV:Select one:a. 602 kmb. 402 kmc. 623 kmd. 690 kme. 562 kmQuestion 11Not yet answeredPoints out of 5.0Flag questionQuestion textType in your answers above into the boxes provided on the webpage and hit “Find Epicenter”.  The next screen will be a map showing circles.  What are these circles themselves individually depicting?Select one:a. The region that experienced earthquake shaking.b. The distance the S and P waves traveled.c. The distance between the seismic recording station and the possible earthquake epicenter.d. The region that received damage during the earthquake.Question 12Answer savedPoints out of 3.0Flag questionQuestion textRichter MagnitudeRead the section on “Magnitude Explained”.  What is the magnitude of an earthquake?  Choose the best answer from the choices belowSelect one:a. It is a measurement of how big an earthquake is.b. It is a scale in which earthquakes are rated depending on how strong they are.c. It is an estimate of the total amount of energy released by an earthquake.d. It is a measurement of how strong an earthquake is based on the damage created.Question 13Not yet answeredPoints out of 3.0Flag questionQuestion textThe Richter magnitude determination is based on measurements made on seismograms.  Two measurements are needed.  What are they?Select one:a. Maximum amplitude of the seismic waves and the S-P time interval.b. Maximum amplitude of the seismic waves and distance the seismic waves travel.c. Magnitude of the earthquake and distance the seismic waves travel.d. S-P interval and the distance the seismic waves travel.InformationFlag questionInformation textClick on “Go to next page”.  Read the information on the “Richter Nomogram” and then click on “Go to next page” again.  Measure the maximum amplitude of the S-wave for each seismogram and record your estimate in the box below the seismogram, then select the best answers from the choices (Questions 14, 15 & 16) below:Question 14Not yet answeredPoints out of 2.0Flag questionQuestion textEureka, CA:Select one:a. 250 mmb. 50 mmc. 285 mmd. 490 mme. 300 mmQuestion 15Not yet answeredPoints out of 2.0Flag questionQuestion textElko, NV:Select one:a. 50 mmb. 120 mmc. 40 mmd. 510 mme. 60 mmQuestion 16Not yet answeredPoints out of 2.0Flag questionQuestion textLas Vegas, NV:Select one:a. 400 mmb. 200 mmc. 64 mmd. 30 mme. 100 mmQuestion 17Not yet answeredPoints out of 2.0Flag questionQuestion textThe page shows a nomogram with three lines representing the data you provided.  Type in your estimate for the earthquake in the box provided on the webpage and click on “Confirm Magnitude”.  Choose the magnitude below that most closely represents the magnitude for this earthquake.Select one:a. 7.5b. 7.1c. 7.8d. 6.5e. 6.1InformationFlag questionInformation text