Did any1 else see the news story....?

About the quake that moved New Zealand? My kids didn't grasp why I found that so interesting and I couldn't figure out how to explain it to them on a level they'd understand. Sadly, while I'm very interested in a lot of different scientific ideas and theories, I can't always understand them. Anyone have an idea about how I can explain the importance of this quake to my boys so they understand? They're 9 and 7. My 14 yr. old tried to help me explain but no luck.