People of China, Japan, Italy, Haiti and Pakistan are familiar from the disaster of earthquakes. It happens when vibrations are caused by the movements of rocks along a fault. As the tectonic plates push against or dive under one another, fault zones are created. Heavy movements can cause vibration in earth crust. Such vibrations ripple violently through the crust causing an earthquake, which might be slow or severe. Disaster depends on intensity of earthquake on Richter scale.