The magnitude 9.0 earthquake and tsunami struck many regions of Japan and destroyed everything in its path. The effects could be felt around the world. Tsunamis have hit Pacific coasts in many countries. Numerous people have died, disappeared or been left homeless. People lived in shelters, without clean water, electricity, telecommunications, etc. Japan is still recovering from the damage with the help of foreign relief efforts. Radioactivity resulting from the meltdown and subsequent debris affects the global environment. Learning about the mega-thrust earthquake will help us improve the warning system which could save people and avoid serious damage