The Earth's crust is in the inner part of the world. If there is sudden release of heavy energy then it leads to earth quake. Seisomometer is a tool used to measure this earthquake. It is measured in richter. If this richter is more than 7 it will cause more damage. If its is 3 it will cause a minor damage. If this same earth quake occurs in the seabed then it leads to Tsunami. If it's intensity is higher then it will also cause serious damages.