Earthquake is a quake, which is the shaking of the surface of the earth resulting from a sudden release of energy in the earth’s lithosphere. It is also known as a tremor or temblor. Earthquakes create seismic waves. It is one of the world’s major disasters. Earthquakes are so devastating that they can destroy a big populated city within a minute. Earthquakes are caused mostly by volcanic activity, mine blasts, landslides and nuclear tests. An earthquake generates a tsunami and also generates a giant tsunami.