We just learned about the earthquake Hypocenter.
Another part of earthquakes is the Tectonic Plates.
The scientist who study earthquakes have mapped out 15 big areas on the earth, on every continent and around the oceans.
These areas are called tectonic plates, and they move around little by little every year.
When one tectonic plate area moves, it bumps into another tectonic plate, and it causes an earthquake!
These plates are millions of miles wide, and over 60 miles deep.
Because they are so huge, when they bump into each other the earth crashing together has a lot of force and makes a big problem.
(from: wikipedia - list of tectonic plates)
Kid Facts - Blast from the past: Sledgehammer
