I have to know when is an earthquake an earthquake? I mean at what magnitude do you feel it or notice things moving? I've been viewing this U.S. website that tracks the worlds earthquakes and it's amazing to me how many there are. Albeit there are alot between 2 and 3 magnitude but many more that are 4 and above! Fortunately I live in a "safe" area but it has felt the odd one now and again. Not like you fellas on the coast!