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# Seismic Refraction - Notes

## The Seismic Sprint
If there is one way to get across the fundamental principle that makes seismic refraction "go" - this may be it - **The Seismic Sprint:**

<iframe width="660" height="317" src="https://www.youtube.com/embed/hN3jw6iklEY" title="Refraction—animation 3 of 7 (educational)" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Links for above video if not playing correctly in webpage:
- [YouTube page](https://www.youtube.com/watch?v=hN3jw6iklEY)
- [Resource page at IRIS](https://www.iris.edu/hq/inclass/animation/seismic_wave_behavior_critically_refracted_rays)

### Related Activity
- https://www.iris.edu/hq/inclass/lesson/determining_shallow_earth_structure

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