Hi im kai jun and im here to tell that earth quakes are caused by the earth's crust crashing into each other i know i maybe wrong by i do know that when earth quakes occure people tend to hind under their tables.I saw on national geographic or some other channel on cable that scientists use some kind of system that detects an earth quake in a building which structure is earth quake proof.I dont think earth quakes will occure since we are near the imaginary line ok i cant explain anymore as have no more infomation thats all!!!!