Define the term earthquake in 200 words

Earthquakes is a sudden movement on the earths surface and also it can be measured by the size and the range for the weakest ones that can not be felt on the earth. Also it is a sudden release of energy in the earths lithosphere that creates seismic waves. Earthquakes can be measured by using measurements from the seismometers. The more numerous earthquakes smaller than magnitude of 5 was reported by national seismological observations are measured mostly on the scale. These two scales are actually numerical similar over the range of validity. The largest earthquake in historic times was measured as 9, although there is no limit to the possible magnitude. The shallower the earthquake is the more damage to the structure it causes. Earthquakes manifest themselves by shaking and sometimes by displacement of the ground. Technically earthquakes happen anywhere in the earth were there is a sufficient stored elastic strain. Most of the earthquakes energy comes from the fractures growth or is converted into heat generated by the friction. There are three main types of faults in a earthquake and they are normal, reverse, and strikeslip. The most parameter controlling the maximum earthquake magnitude on a fault is however is not the maximum available length.