Earthquake

An earthquake is a vibration or shock that occurs on the surface of the earth due to the release of energy from the sudden that creates seismic waves. Common Earthquake caused by movement of the Earth 's crust (plates of the Earth). The frequency of a region, based on the type and size of the Earth quakes occurred over a period of time. Earthquake measured with a seismometer. 

 

Moment magnitude is the most common scale on which earthquakes occur Earth for worldwide. Rickter Scale is a scale that is reported by national seismological observatories are measured on a scale of local magnitude 5 magnitude . both the same scale for their figures valid range. magnitude quake 3 or more predominately barely visible and her big 7 more potential to cause serious damage in a wide area, depending on the depth of the earthquake. The largest historic earthquake magnitude was over 9, although there is no limit in size. The last large earthquake magnitude 9.0 or larger was 9.0 magnitude earthquake in Japan in 2011 (as of March 2011), and it was the largest Japanese earthquake since records began. The intensity of the vibration measured on modified Mercalli intensity scale.