Abstract
The study of the Gutenberg-Richter (GR) parameters a and b has been very important to describe and characterize the seismicity over the different seismic provinces around the world. As far as we know, the possible correlation between the GR parameters a and b has not received enough attention. Bayrak et al. reported the a and b values for 27 active seismic regions around the boundaries of the main tectonic plates of the world. From these data, we found that there exists a positive correlation between the a and b parameters (R = 0.85, R2 = 0.72). On the other hand, we made around 150 computer runs of a spring-block model proposed by Olami et al. (Phys Rev Lett 68(8):1244–1247, 1992). This model roughly emulates the interaction between two fault planes and it reaches a self-organized critical state. With these simulations, we also found that the a and b parameters are positively correlated. Motivated by these results, we propose an analytical demonstration that indeed a and b are positively correlated. In addition, we discuss on other possible applications of the spring-block model to actual seismicity and to frictional experiments made with sandpapers.
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FAB and AMD thank the partial support from COFAA-IPN and EDI-IPN; AGS thanks ABACUS-CINVESTAV and JPO thanks support from CONACYT-México.
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Appendix
Appendix
Let us consider the following modified Utsu law:
The Gutenberg-Richter law establishes that
and Aki’s relation is
Taking logarithm in both sides of Eq. A.3, it follows that
Substituting Eq. A.1 in the right side of Eqs. A.4 and A.2 in the left side of Eq. A.4, we have
Therefore,
On the other hand, consider now another modified Utsu relation; that is,
Following the same steps to obtain Eq. A.5, we arrive at
As we can see in Eqs. A.5 and A.7, the positive correlation between the GR parameters a and b remains for both modified Utsu relations. Even in the extreme case of M = 10, the coefficient of b in Eq. A.5 is 3.90 and that for Eq. A.7 is 2.95; that is, in both cases, this coefficient is positive, such as that we obtain for the Bayrak et al. (2002) data.
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Perez-Oregon, J., Muñoz-Diosdado, A., Rudolf-Navarro, A.H. et al. On the possible correlation between the Gutenberg-Richter parameters of the frequency-magnitude relationship. J Seismol 22, 1025–1035 (2018). https://doi.org/10.1007/s10950-018-9757-6
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DOI: https://doi.org/10.1007/s10950-018-9757-6