Locating the Epicenter of an Earthquake Lesson

Identify the location of an earthquake epicenter using a travel time graph and three seismograph tracings. The epicenter is the point on Earth's surface directly above an earthquake. Seismic stations detect earthquakes by the tracings made on seismographs. Tracings made at three separate seismic stations are needed to locate an earthquake epicenter.

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Locating the Epicenter of an Earthquake Lesson

Please share any feedback for how to:

better integrate this StarLogo Nova model into this lesson,
make this model more realistic, and
how can I create circles to represent each seismographs distance to the epicenter (as opposed to the current radial lines)?

Do you have a model associated with this lesson? If so, please post the link.

I saw it now - The resource name is the same as the comment name so I got confused!

Here's a revised version... https://www.slnova.org/ilee/projects/746534/