Finite-fault scaling relations in Mexico

Rodríguez-Pérez, Quetzalcóatl; Ottemöller, Lars

doi:10.1093/gji/ggt050

Cited by 10 publications

(4 citation statements)

References 45 publications

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“…Earlier investigations of source-scaling properties based exclusively on rupture models lacked very large magnitude events (e.g., Somerville et al, 1999;Mai and Beroza, 2000). Other studies focused on region-specific scaling relationships (Murotani et al, 2008;Yen and Ma, 2011;Rodríguez-Pérez and Ottemöller, 2013;Ramírez-Gaytán et al, 2014) or a specific fault regime, like subduction events (Murotani et al, 2013;Skarlatoudis et al, 2016;Ye et al, 2016). Thus, there is a need to reexamine earthquake source-scaling properties using a global set of rupture models, considering different faulting regimes and including very large and megathrust events.…”

Section: Introductionmentioning

confidence: 99%

New Empirical Earthquake Source‐Scaling Laws

Thingbaijam

Martin

Goda

2017

Bulletin of the Seismological Society of America

196

175

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We develop new empirical scaling laws for rupture width W, rupture length L, rupture area A, and average slip D, based on a large database of rupture models. The database incorporates recent earthquake source models in a wide magnitude range (M w 5.4-9.2) and events of various faulting styles. We apply general orthogonal regression, instead of ordinary least-squares regression, to account for measurement errors of all variables and to obtain mutually self-consistent relationships. We observe that L grows more rapidly with M w compared to W. The fault-aspect ratio (L=W) tends to increase with fault dip, which generally increases from reversefaulting, to normal-faulting, to strike-slip events. At the same time, subduction-interface earthquakes have significantly higher W (hence a larger rupture area A) compared to other faulting regimes. For strike-slip events, the growth of W with M w is strongly inhibited, whereas the scaling of L agrees with the L-model behavior (D correlated with L). However, at a regional scale for which seismogenic depth is essentially fixed, the scaling behavior corresponds to the W model (D not correlated with L). Selfsimilar scaling behavior with M w − log 10 A is observed to be consistent for all the cases, except for normal-faulting events. Interestingly, the ratio D=W (a proxy for average stress drop) tends to increase with M w , except for shallow crustal reversefaulting events, suggesting the possibility of scale-dependent stress drop. The observed variations in source-scaling properties for different faulting regimes can be interpreted in terms of geological and seismological factors. We find substantial differences between our new scaling relationships and those of previous studies. Therefore, our study provides critical updates on source-scaling relations needed in seismic-tsunami-hazard analysis and engineering applications. Electronic Supplement: Figures depicting regression analysis, normality probability plots, and comparisons between different source-scaling relationships; and tables listing rupture models and different earthquake source-scaling relationships.

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Section: Introductionmentioning

confidence: 99%

New Empirical Earthquake Source‐Scaling Laws

Thingbaijam

Martin

Goda

2017

Bulletin of the Seismological Society of America

196

175

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“…inRodríguez-Pérez and Ottemöller (2013) are expected. Nevertheless, the rupture duration shows a clear dependency on the magnitude.5.2.2 Case-study (Oaxaca, M w = 7.4, 20/03/2012) …”

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confidence: 87%

“…Murotani et al (2008) showed that A a /A eff is approximately equal to 20% for plate-boundary events. Similarly, for subduction events, the value of A a /A eff is approximately equal to 25% (Somerville et al, 2002;Rodríguez-Pérez and Ottemöller, 2013). The previous average values were determined considering values that range from 0.09 to 0.35.…”

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confidence: 99%

TREMOL: A stochastic rupture earthquake code based on the fiber bundle model. Application to Mexican subduction earthquakes

Monterrubio-Velasco¹,

Rodríguez-Pérez²,

Zúñiga³

et al. 2019

Preprint

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In general terms, earthquakes are the result of brittle failure within the heterogeneous crust of the Earth. However, the rupture process of a heterogeneous material is a complex physical problem which is difficult to model deterministically due to the numerous parameters and physical conditions, which are largely unknown. Considering the variability within the parametrization, it is necessary to analyze earthquakes by means of different approaches. Computational physics may offer alternative ways to study brittle rock failure by generating synthetic seismic data based on physical and statistical models, 5 and by the use of only few free parameters. The Fiber Bundle model (FBM) is a discrete element model, which is able to describe complex rupture processes in heterogeneous materials. In this article, we present a computer code called stochasTic Rupture Earthquake MOdeL, TREMOL. This code is based on the principle of the FBM to investigate the rupture process of asperities on the earthquake rupture surface. In order to validate TREMOL, we carried out a parametric study at first to identify the best parameter configuration while minimizing computational efforts. As test cases, we applied the final configuration to 10 10 Mexican subduction zone earthquakes in order to compare the synthetic results by TREMOL with real data. According to our results, TREMOL is able to model the rupture of an asperity that is defined essentially by two basic dimensions: (1) the size of the fault plane, and (2) the size of the maximum asperity within the fault plane. Based on this data, and few additional parameters, TREMOL is able to generate numerous earthquakes as well as a maximum magnitude for different scenarios within a reasonable error range. The simulated earthquakes magnitudes are of the same order as the real earthquakes. Thus, TREMOL 15 can be used to analyze the behavior of a single asperity or a group of asperities since TREMOL considers the maximum magnitude occurring on a fault plane as a function of the size of the asperity. TREMOL is a simple, and flexible model which allows its users to investigate the role of the initial stress configuration, and the dimensions and material properties of seismic asperities. Although various assumptions and simplifications are included in the model, we show that TREMOL can be a powerful tool which can deliver promising new insights into earthquake rupture processes. 20Copyright statement. TEXT 1 Geosci. Model Dev. Discuss., https://doi.Rupture models of large earthquakes suggest significant heterogeneity in slip and moment release over the fault plane, (e.g., Aochi and Ide, 2011). In order to characterize the seismic source rupture complexity, two main models have been proposed: the asperity model (Kanamori and Stewart, 1978), and the barrier model (Das and Aki, 1977). Asperities are defined as regions on the fault rupture plane that have larger slip and strength in comparison to the average values on the fault plane (Somerville 5 et al., 1999). Asperities also have larger stress ...

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“…It is important to highlight that, according to results in Rodríguez-Pérez and Ottemöller (2013), the size of an earthquake not only depends on the effective area. It also depends on the size of the asperity, among other possible influential variables.…”

Section: Reference Earthquake Datamentioning

confidence: 99%

The role of asperities in seismicity frequency-magnitude relations using the TREMOL v0.1.0. The case of the Guerrero-Oaxaca subduction zone, México

Monterrubio-Velasco

Zúñiga

Aguilar-Meléndez

et al. 2020

Preprint

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Abstract. Seismicity and magnitude distributions are fundamental for any type of seismic hazard analysis. The Mexican subduction zone along the Pacific Coast is one of the most active seismic zones in the world. Some peculiar characteristics of the seismicity have been observed for a subregion of the subduction regime, which has been named SUB3 in a recent seismotectonic regionalization of the country, suggesting that the observed simplicity of this source arises from the rupturing of single asperities. In this work, we numerically test this hypothesis using the TREMOL (sThochastic Rupture Earthquake MOdeL) v0.1.0 code. As test cases, we choose four of the most significant events (6.5

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Finite-fault scaling relations in Mexico

Cited by 10 publications

References 45 publications

New Empirical Earthquake Source‐Scaling Laws

New Empirical Earthquake Source‐Scaling Laws

TREMOL: A stochastic rupture earthquake code based on the fiber bundle model. Application to Mexican subduction earthquakes

The role of asperities in seismicity frequency-magnitude relations using the TREMOL v0.1.0. The case of the Guerrero-Oaxaca subduction zone, México

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