Name: ______________________________________ Date: ________________________ Student Exploration: Earthquakes 2 – Determination of Epicenter [NOTE TO TEACHERS AND STUDENTS: This exercise assumes th at you have a data table and graph made while using the Earthquakes 1 – Recording Center Gizmo™. If you do not have those, or have never used that Gizmo before, do that first.] Vocabulary: body wave, earthquake, epicenter, fault, focus, P wave, S wave, seismic wave, seismogram, seismograph Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Three dogs meet in a park. Each dog is attached by a leash to its owner (triangles). 1. What does each colored circle represent? ________________ __________________________________________________ 2. Where could all the dogs meet in one place? Draw this point on the diagram. 3. Is there another spot where all three dogs could meet? ______ Explain: ___________________________________________ Gizmo Warm-up When you used the Earthquakes 1 – Recording Station Gizmo™, you learned how to find the distance from a recording station to the epicenter. With the Earthquakes 2 – Determination of Epicenter Gizmo, you will use data from three recording stations to find the exact location of the epicenter. Click Play ( ), and then click Pause ( ) when the seismograms are complete. Compare the three seismograms. 1. Which recording station is closest to the epicenter? ______ How do you know? _________________________________________________________ 2. Which recording station is farthest from the epicenter? ______ How do you know? _________________________________________________________ https://www.coursehero.com/file/35698540/Earthquakes2EpicenterSEpdf/ This study resource was shared via CourseHero.comActivity: Locating the epicenter Get the Gizmo ready: x Click Reset ( ). x Click Play, and then click Pause when the seismograms are complete. Goal: Based on three seismograms, locate the epicenter of an earthquake. 1. Prepare: To complete this activity, you will need the table and graph you made in the Earthquakes 1 – Recording Station Student Exploration. Take this out now. 2. Measure: Turn on Show time probe. On each seismogram, locate the first P-wave and the first S-wave. Measure the time interval (∆t) for each seismogram, and then use your graph to find the distance of each station to the epicenter. Station Time interval (∆t) Distance to epicenter (km) ABC 3. Locate: Turn on the Show station A checkbox. Set the Radius to the distance of station A from the epicenter, based on your table above. Look on the circle on the map. Where could the epicenter be located? __________________________________________ 4. Locate: Turn on the Show station B checkbox. Set the Radius to the distance of station B from the epicenter. Look on the two circles on the map. Which two places could the epicenter be located now? _____________________________ _________________________________________________________________________ 5. Locate: Turn on the Show station C checkbox. Set the Radius to the distance of station C from the epicenter. If you did everything right, you should see the epicenter symbol ( ). If you do not, recheck all of your distances. (You may need to adjust each radius slightly.) Relative to the three circles, where is the epicenter located? _________________________ _________________________________________________________________________ 6. Practice: Click Reset. Try to locate at least five more epicenters. Each time you locate an epicenter, click the Tools palette and click Screen shot. Right-click the image, choose “Copy Image,” and paste the image into a blank document to turn in with this sheet. https://www.coursehero.com/file/35698540/Earthquakes2EpicenterSEpdf/ This study resource was shared via CourseHero.com Powered by TCPDF (www.tcpdf.org)