In the February issue of the Google Earth Sightseer I noticed an announcement that the Earthquakes layer has been updated. Now you can see the geographic location, date, time, and magnitude of earthquakes for the past 40 years. You can also download the file by clicking on the link in any of the earthquake placemarks and track current earthquakes with your kids. I also noticed that this file also shows you the type of boundary at each plate and how much it moves each year.
If you are 6th grade science teacher in California this resource ties right into Science Content Standard 6.1 and gives you an awesome excuse to use Google Earth with your students. To find earthquake layer look for Geographic Features in the Layers box (lower left corner), open the box and put a check mark in the Earthquakes box.