Main objective of this lecture is to presentation on Earthquakes result from Seismic Waves. Earthquakes derive from seismic waves generated coming from motion along a failing, such as the San Andreas. Earthquakes will be the most destructive natural forces on earth. The Alaskan earthquake of 1964 was one of many three most powerful seismic events previously century. Earthquakes occur along effective faults where energy is usually stored and suddenly released once the stresses along the failing exceed the frictional causes resisting motion. The longer time interval between seismic events the harder the magnitude of the earthquake.