197 6. The use of passive seismic methods for Geothermal exploration and monitoring Figure 6.7 Modified after Antayhua-Vera (2017). (a) The map shows focal mechanisms obtained from 91 seismic events. (b) Classification of events. (c) Spherical projection of pressure. (d) Spherical projection of tension axis (e) is the Rose diagram of the tension axis, with arrows indicating the preferential directions of all focal mechanisms. Statistical seismology In this context, statistical seismology refers to a method dedicated to analyzing the statistical relationship that exists between the number of seismic events and the magnitude of the events. Gutenberg and Richter (1944) identified an exponential relationship between the number of earthquakes and their magnitude, and express the frequency of occurrences of seismic events as: log N = a – bM (6.1) where N represents the cumulative number of earthquakes whose magnitude exceeds M, and a and b are fitting parameters that describe the relationship at a given location for a given observation period.
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