2.6 Further study: For the debate around "Earthquake prediction" or Others The earthquake prediction program has two tactics; Detection of precursors prior to an earthquake. Finding recurrence cycle of major earthquakes. This model suggests that the size of an earthquake strongly depends on a stochastic process. The size of an earthquake can not be predicted before the event occurs or an earthquake does not know when "she ends"! It is possible to extend this model to a debate around the earthquake prediction as a negative opinion model. This model suggests that an earthquake is not a simple process but a complicated stochastic one. So, if this model is true, both a small earthquake and a huge one have the same starting process. The size of an earthquake is completely controlled by a "dice"! This model destroys the optimistic views on "earthquake prediction". This type CA is now called "percolation" by physicists and is examined under various modifications. A similar pattern of water percolation between two glass plates. Same rules can explain the propagation of fires, diseases, rumors etc. The percolation theory states that such systems show clear "Fractal scaling" or "Self-Similar" behavior at their critical state (Fig.4-6). Self-similar pattern is a distinctive "finger print" of Fractal.