Some earthquakes are so weak that most people never feel them. Other earthquakes cause noticeable shaking, and some cause widespread damage. Geologists have several ways of ranking earthquakes.

To learn more about how earthquakes are classified:

1. Go to the What's Shaking? WWW Sheet and print it.

2. Visit these Web sites. Then complete the WWW Sheet.
    Richter Scale
    Mercalli Intensity Scale
    Seismic Intensity Scales

3. For more information about where earthquakes occur, visit this Web page.
    Earthquake Globe