# The Epicenter of a Southwestern Earthquake

## Summary

This activity guides students to use the measured difference in P and S wave velocities to locate the epicenter of a minor earthquake in the Southwestern United States.

Click here to view the full activity on the Kéyah Math Project website.

Click here to view the full activity on the Kéyah Math Project website.

## Learning Goals

**Objectives**

- Determine the speed of P and S waves from an earthquake.
- Use equations to locate the epicenter of an earthquake in the Southwest as the intersection of three circles.

**Mathematical Skills**

- Basic algebra.
- Equation of a line.
- Radius of a circle.

## Context for Use

This activity consists of a set of quantitative problem-solving exercises that can be used as an in-class activity or an assignment in any introductory course with a unit on earthquake seismology, such as:

- Physical geology or physical geography
- Environmental geology, natural hazards, natural disasters
- Earth system science or Earth and space science
- Southwest regional geology

## Description and Teaching Materials

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## Teaching Notes and Tips

An Instructor's Guide to all Kéyah Math activities is available online from the Instructor Resources page on the Kéyah Math website.

## Assessment

Students record their work and answers in a word-processor document or a notebook, which can be submitted to the instructor for assessment. Solutions to these problems are available online from the Instructor Resources page on the Kéyah Math website.

## References and Resources

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