Informational analysis of Langevin equation of friction in earthquake rupture processes

2019 ◽  
Vol 29 (10) ◽  
pp. 103120 ◽  
Author(s):  
T.-H. Wu ◽  
C.-C. Chen ◽  
M. Lovallo ◽  
L. Telesca
Keyword(s):  
Langevin Equation ◽  
Earthquake Rupture ◽  
Earthquake Rupture Processes

scholarly journals A stochastic rupture earthquake code based on the fiber bundle model (TREMOL v0.1): application to Mexican subduction earthquakes

2019 ◽  
Vol 12 (5) ◽  
pp. 1809-1831 ◽  
Author(s):  
Marisol Monterrubio-Velasco ◽  
Quetzalcóatl Rodríguez-Pérez ◽  
Ramón Zúñiga ◽  
Doreen Scholz ◽  
Armando Aguilar-Meléndez ◽  
...  
Keyword(s):  
Fiber Bundle ◽  
Fault Plane ◽  
Heterogeneous Material ◽  
Computer Code ◽  
Rupture Process ◽  
Maximum Magnitude ◽  
Earthquake Rupture ◽  
General Terms ◽  
Fiber Bundle Model ◽  
Earthquake Rupture Processes

Abstract. 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 that is difficult to model deterministically due to numerous parameters and physical conditions, which are largely unknown. Considering the variability within the parameterization, 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 and through the use of only few free parameters. The fiber bundle model (FBM) is a stochastic discrete model of material failure, which is able to describe complex rupture processes in heterogeneous materials. In this article, we present a computer code called the 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 to identify the best parameter configuration while minimizing computational efforts. As test cases, we applied the final configuration to 10 Mexican subduction zone earthquakes in order to compare the synthetic results by TREMOL with seismological observations. According to our results, TREMOL is able to model the rupture of an asperity that is essentially defined 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 these 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 earthquake magnitudes are of the same order as the real earthquakes. Thus, TREMOL 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 that 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 to deliver promising new insights into earthquake rupture processes.

scholarly journals Paleoseismological uncertainty estimation in the Acambay region, Central Mexico

2017 ◽  
Vol 56 (3) ◽  
Author(s):  
Quetzalcoatl Rodríguez-Pérez ◽  
F. Ramón Zúñiga ◽  
Pierre Lacan
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Central Mexico ◽  
Earthquake Rupture ◽  
Relative Importance ◽  
Logic Tree ◽  
Systematic Treatment ◽  
Recurrence Period ◽  
Geological Features ◽  
Earthquake Rupture Processes

Paleseismological studies provide valuable information of the earthquake rupture processes such as fault dimensions, average and maximum displacements, as well as recurrence times and magnitudes of events which took place in the geologic past. This information is based on observations of the geological record. Interpretation of geological observa-tions has a source of uncertainties inherent to the large number of hypothesis that explain the observed geological features. Information obtained from paleoseismic studies is im-portant in seismic hazard analyses, and particularly crucial for regions of low seismic activity where the recurrence period of major earthquakes reaches several thousand years. However, using this information in hazard analysis requires the systematic treatment of uncertainties. We estimated uncertainties of four paleoseismological studies conducted at three different faults of the Acambay graben region in Central Mexico. The method used is based on a logic-tree formalism that quantifies the cumulative uncertainties associated with the different stages of the paleoseismic studies together with a quantification of the entropy at each step and at the end of the process. The final uncertainty and its relative importance in seismic hazard analysis is expressed as the paleoseismic quality factor, which indicate 0.14, 0.40-0.50, and 0.41 for the Acambay-Tixmadejé, Pastores and San Mateo faults, respectively. These values can be incorporated in seismic hazard analyses for the region.

scholarly journals Petrophysical, geochemical, and hydrological evidence for extensive fracture-mediated fluid and heat transport in the Alpine Fault's hanging-wall damage zone

2021 ◽  
Author(s):  
John Townend ◽  
Rupert Sutherland ◽  
VG Toy ◽  
ML Doan ◽  
B Célérier ◽  
...  
Keyword(s):  
Numerical Models ◽  
Hanging Wall ◽  
Damage Zone ◽  
Active Faults ◽  
Outer Zone ◽  
Earthquake Rupture ◽  
Fault Rock ◽  
Spatial And Temporal Scales ◽  
Alpine Fault ◽  
Earthquake Rupture Processes

© 2017. American Geophysical Union. All Rights Reserved. Fault rock assemblages reflect interaction between deformation, stress, temperature, fluid, and chemical regimes on distinct spatial and temporal scales at various positions in the crust. Here we interpret measurements made in the hanging-wall of the Alpine Fault during the second stage of the Deep Fault Drilling Project (DFDP-2). We present observational evidence for extensive fracturing and high hanging-wall hydraulic conductivity (∼10−9 to 10−7 m/s, corresponding to permeability of ∼10−16 to 10−14 m2) extending several hundred meters from the fault's principal slip zone. Mud losses, gas chemistry anomalies, and petrophysical data indicate that a subset of fractures intersected by the borehole are capable of transmitting fluid volumes of several cubic meters on time scales of hours. DFDP-2 observations and other data suggest that this hydrogeologically active portion of the fault zone in the hanging-wall is several kilometers wide in the uppermost crust. This finding is consistent with numerical models of earthquake rupture and off-fault damage. We conclude that the mechanically and hydrogeologically active part of the Alpine Fault is a more dynamic and extensive feature than commonly described in models based on exhumed faults. We propose that the hydrogeologically active damage zone of the Alpine Fault and other large active faults in areas of high topographic relief can be subdivided into an inner zone in which damage is controlled principally by earthquake rupture processes and an outer zone in which damage reflects coseismic shaking, strain accumulation and release on interseismic timescales, and inherited fracturing related to exhumation.

scholarly journals Petrophysical, geochemical, and hydrological evidence for extensive fracture-mediated fluid and heat transport in the Alpine Fault's hanging-wall damage zone

2021 ◽  
Author(s):  
John Townend ◽  
Rupert Sutherland ◽  
VG Toy ◽  
ML Doan ◽  
B Célérier ◽  
...  
Keyword(s):  
Numerical Models ◽  
Hanging Wall ◽  
Damage Zone ◽  
Active Faults ◽  
Outer Zone ◽  
Earthquake Rupture ◽  
Fault Rock ◽  
Spatial And Temporal Scales ◽  
Alpine Fault ◽  
Earthquake Rupture Processes

© 2017. American Geophysical Union. All Rights Reserved. Fault rock assemblages reflect interaction between deformation, stress, temperature, fluid, and chemical regimes on distinct spatial and temporal scales at various positions in the crust. Here we interpret measurements made in the hanging-wall of the Alpine Fault during the second stage of the Deep Fault Drilling Project (DFDP-2). We present observational evidence for extensive fracturing and high hanging-wall hydraulic conductivity (∼10−9 to 10−7 m/s, corresponding to permeability of ∼10−16 to 10−14 m2) extending several hundred meters from the fault's principal slip zone. Mud losses, gas chemistry anomalies, and petrophysical data indicate that a subset of fractures intersected by the borehole are capable of transmitting fluid volumes of several cubic meters on time scales of hours. DFDP-2 observations and other data suggest that this hydrogeologically active portion of the fault zone in the hanging-wall is several kilometers wide in the uppermost crust. This finding is consistent with numerical models of earthquake rupture and off-fault damage. We conclude that the mechanically and hydrogeologically active part of the Alpine Fault is a more dynamic and extensive feature than commonly described in models based on exhumed faults. We propose that the hydrogeologically active damage zone of the Alpine Fault and other large active faults in areas of high topographic relief can be subdivided into an inner zone in which damage is controlled principally by earthquake rupture processes and an outer zone in which damage reflects coseismic shaking, strain accumulation and release on interseismic timescales, and inherited fracturing related to exhumation.

scholarly journals Geologic Inheritance and Earthquake Rupture Processes: The 1905 M ≥ 8 Tsetserleg-Bulnay Strike-Slip Earthquake Sequence, Mongolia

2018 ◽  
Vol 123 (2) ◽  
pp. 1925-1953 ◽  
Author(s):  
Jin-Hyuck Choi ◽  
Yann Klinger ◽  
Matthieu Ferry ◽  
Jean-François Ritz ◽  
Robin Kurtz ◽  
...  
Keyword(s):  
Strike Slip ◽  
Earthquake Sequence ◽  
Earthquake Rupture ◽  
Earthquake Rupture Processes

scholarly journals Automatic imaging of earthquake rupture processes by iterative deconvolution and stacking of high-rate GPS and strong motion seismograms

2014 ◽  
Vol 119 (7) ◽  
pp. 5633-5650 ◽  
Author(s):  
Yong Zhang ◽  
Rongjiang Wang ◽  
Jochen Zschau ◽  
Yun-tai Chen ◽  
Stefano Parolai ◽  
...  
Keyword(s):  
Strong Motion ◽  
High Rate ◽  
Earthquake Rupture ◽  
Earthquake Rupture Processes ◽  
Iterative Deconvolution
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