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On the possible correlation between the Gutenberg-Richter parameters of the frequency-magnitude relationship

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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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Funding

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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Correspondence to J. Perez-Oregon.

Appendix

Appendix

Let us consider the following modified Utsu law:

$$ log~ S = 1.02M - 4.01. $$
(A.1)

The Gutenberg-Richter law establishes that

$$ log\ \dot{N}=a-bM. $$
(A.2)

and Aki’s relation is

$$ \dot{N} = CS^{-b}. $$
(A.3)

Taking logarithm in both sides of Eq. A.3, it follows that

$$ log\ \dot{N} = log\ C- b\ log\ S. $$
(A.4)

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

$$a - bM = log\ C - b (1.02M - 4.01) , $$
$$\Rightarrow \quad a = log\ C - 1.02bM + bM + 4.01b. $$

Therefore,

$$ a = (4.01 - 0.02M)b + log\ C. $$
(A.5)

On the other hand, consider now another modified Utsu relation; that is,

$$ log\ S = 1.21M - 5.05. $$
(A.6)

Following the same steps to obtain Eq. A.5, we arrive at

$$ a = (5.05 - 0.21M)b + log\ C . $$
(A.7)

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

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