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=Welcome to Earthquake Investigation for Lake Mills Seventh Graders= To learn more about how seismic data is used to analyze earthquakes we will explore the Virtual Earthquake program.

**//Virtual Earthquake// will show you the recordings of an earthquake's seismic waves detected by instruments far away from the earthquake. The instrument recording the seismic waves is called a seismograph and the recording is a seismogram. The point of origin of an earthquake is called its focus and the point on the earth's surface directly above the focus is the epicenter. You are to locate the epicenter of an earthquake by making simple measurement on three seismograms that will be sent to you by the //Virtual Earthquake// program. Additionally, you will be required to determine the Richter Magnitude of that quake from the same recordings. Richter Magnitude is an estimate of the amount of energy released during and earthquake.**

Before beginning, conduct the tutorials at the following links. [] (Be sure to do both the single and two station lab tutorials before continuing to the next tutorial link.)

A. If you would like to try the online __interactive__ version, go to [] where you will complete two sections, **Travel Time** and **Epicenter and Magnitude.** B. If the software is too challenging or doesn't work well for you, the previous version can be found and completed using the following link: []


 * Complete the worksheet and turn it in.**

If you have lost your assignment, you may find a copy at []