Earthquake is one of the most severe natural disasters. It's shaking of the ground caused by the sudden breaking and shifting of large sections of Earth's rocky ourter shell. Its results can be very horrible. The Wenchuan Earthquake in 2008 and Japan Earthquake in 2011 are the most severe earthquakes in recent years, causing huge casualties and property losses. But earthquakes almost never kill people directly. Many deaths and injuries in earthquaking result from falling objects and the collapse of buildings.