Law of Gutenberg-Richter
In seismology, the law of Gutenberg-Richter says that the number of Séisme S NR per unit of time of magnitude higher than M is form in a given volume:
where Log is the function decimal logarithm. The first definition is proposed by Beno Gutenberg and Charles Francis Richter in 1949 when this law is checked on a total scale for the interval magnitudes corresponding to a complete catalog.
The variable has is an indicator of the rate of seismicity while B represents the relationship between great seisms and small seisms. If B has a value rather not very variable around 1, has can have very important variations according to studied volume. This property of the seismicity seems very stable on all the scales.
This law belongs to the laws of recurrence which are used in seismology to define the seismicity. Another law often used is that based on a characteristic model of earthquake
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