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7 results for “Earthquake cycle”
Numerical modeling of the seismic cycle for normal and reverse faulting earthquakes in Italy
<p>Results of the numerical models expressed in terms of nodal stresses, strains and displacements.</p> <p>Data Set S1. Nodal values of the modelled displacements for the L’Aquila 2009 earthquake.</p> <p>Data Set S2. Nodal values of the modelled strain tensor for the L’Aquila 2009 earthquake.</p> <p>Data Set S3. Nodal values of the modelled stress tensor for the L’Aquila 2009 earthquake.</p> <p>Data Set S4. Nodal values of the modelled displacements for the Norcia 2016 earthquake.</p> <p>Data Set S5. Nodal values of the modelled strain tensor for the Norcia 2016 earthquake.</p> <p>Data Set S6. Nodal values of the modelled stress tensor for the Norcia 2016 earthquake.</p> <p>Data Set S7. Nodal values of the modelled displacements for the Emilia 2012 earthquake.</p> <p>Data Set S8. Nodal values of the modelled strain tensor for the Emilia 2012 earthquake.</p> <p>Data Set S9. Nodal values of the modelled stress tensor for the Emilia 2012 earthquake.</p>
Modeling subduction megathrust earthquake cycle: Insights from a visco-elasto-plastic analog model
<p><strong>The dataset :</strong><br> The directory DATASET.zip provides data from subduction megathrust earthquake cycle analog experiments and results described in Caniven and Dominguez (2020). The data set contains all files for displacement fields (*.grd), time series of geodetic displacement (img_dcumul*.txt) and cumulative fault slip (profil*.gmt) and a spreadsheet file (*.numbers) used in plots of Figure 3 to Figure 10 in the paper. For each figure directory, we provide an example of script (SCRIPT_gmt*.txt) that can be used to display the data using the GMT software (Global Mapping Tools). The provided scripts have been developped to be used with GMT 5.4.4. The use of other versions may require some adjustments. See header of scripts for details.</p> <p><strong>The supporting movies :</strong><br> The Movies S1 and S2 show more complete records of experiments performed at two different tectonic loading rates. They corresponds to experiments analyzed in Figure 9 of the paper. Movies S1 is the "slow" experiment and Movies S2 is the "fast" one. The time-step is 5 seconds. All components of displacements field are plotted with associated profiles.</p> <p><strong>The analog model :</strong><br> The analog model reproduces subduction earthquake cycles using a multi-layered visco-elasto-plastic rheology. This includes the ductile mantle wedge with the overlying elastic part of the lithospheric plate and a subducting elastic oceanic crust. The frictional properties along the seismogenic zone favor stick-slip behavior from the trench to the brittle-ductile transition zone beyond which stable creep is dominant. Interseismic, coseismic and postseismic phases, including after-slip and viscoelastic relaxation are well reproduced. The model generates a wide range of slip events from creep to slow-slip events to earthquakes. Results reveals that the loading rate significantly controls fault slip stability by acting on the brittle-ductile coupling and the elastic strain energy stored during the interseismic stage. Slip properties depends also on the mean normal stress imposed along the fault zone. Finally, isolated and precursory slow-slip events are observed before the dynamic failure. The fault geometrical complexity is favored to explain the richness of the observed slip behavior.</p>
Earthquake Cycle Deformation Associated with the 2021 Mw 7.4 Maduo (Eastern Tibet) Earthquake: An Intrablock Rupture Event on a Slow-Slipping Fault from Sentinel-1 InSAR and Teleseismic Data
<p>Coseismic slip models of the 2021 Mw 7.4 Maduo (eastern Tibet) earthquake derived from Sentinel-1 InSAR and teleseismic data.</p> <p>Interseismic eastward and vertical velocity and maximum shear strain rate fields.</p> <p>Citations:</p> <p>Fang, J., Ou, Q., Wright, T. J., Okuwaki, R., Amey, R. M. J., Craig, T. J., et al. (2022). Earthquake cycle deformation associated with the 2021 M<span>W </span>7.4 Maduo (eastern Tibet) earthquake: An intrablock rupture event on a slow-slipping fault from Sentinel-1 InSAR and teleseismic data. Journal of Geophysical Research: Solid Earth, 127, e2022JB024268. <span>https://</span>doi.org/10.1029/2022JB024268</p> <p>Fang, J., Ou, Q., Wright, T. J., Okuwaki, R., Amey, R. M. J., Craig, T. J., et al. (2022). Earthquake cycle deformation associated with the 2021 M<span>W </span>7.4 Maduo (eastern Tibet) earthquake: An intrablock rupture event on a slow-slipping fault from Sentinel-1 InSAR and teleseismic data [Data set]. Zenodo. https://doi.org/10.5281/zenodo.7215161<span>.</span></p>
Simulation results for the earthquake cycle including huge SSEs.
<p>The damped data for the simulation results shown in the paper titled "Nucleation for characteristic earthquakes in simulated cycles involving huge slow slip events on the deeper estension"(now in under review), authored by Ohtani, Makiko, N. Kame, and M. Nakatani.</p> <p> </p> <p> </p>
A Novel Hybrid Finite Element-Spectral Boundary Integral Scheme for Modeling Earthquake Cycles: Application to Rate and State Faults with Low-Velocity Zones
<p>We present a novel hybrid finite element (FE) - spectral boundary integral (SBI) scheme that enables efficient simulation of earthquake cycles. This combined FE-SBI approach captures the benefits of finite elements in modelling problems with nonlinearities, as well as the computational superiority of SBI. The domain truncation enabled by this scheme allows us to utilize high-resolution finite elements discretization to capture inhomogeneities or complexities that may exist in a narrow region surrounding the fault. Combined with an adaptive time stepping algorithm, this framework opens new opportunities for modeling earthquake cycles with high-resolution fault zone physics. In this initial study, we consider a two dimensional (2-D) anti-plane model with a vertical strike-slip fault governed by rate and state friction in the quasi-dynamic limit under the radiation damping approximation. The proposed approach is first verified using the benchmark problem BP-1 from the Southern California Earthquake Center (SCEC) sequence of earthquake and aseismic slip (SEAS) community verification effort. The computational framework is then utilized to model the earthquake sequence and aseismic slip of a fault embedded within a low-velocity fault zone (LVFZ) with different widths and compliance levels. Our results indicate that sufficiently compliant LVFZs contribute to the emergence of sub-surface events that fail to penetrate to the free surface and may experience earthquake clusters with nonuniform inter-seismic time. Furthermore, the LVFZ leads to slip rate amplification relative to the homogeneous elastic case. We discuss the implications of our results for understanding earthquake complexity as an interplay of fault friction and bulk heterogeneities. The complete work consists of all files listed below. </p>
Data for "Characteristics of earthquake cycles: a cross-dimensional comparison 0D to 3D"
<p>This is the data used in "Characteristics of earthquake cycles: a cross-dimensional comparison 0D to 3D". The paper is currently under review. See README.txt for more information.</p>
Rupture Jumping and Seismic Complexity in Models of Earthquake Cycles for Fault Stepovers with Off-Fault Plasticity
<p>Fault stepovers are prime examples of geometric complexity in natural fault zones which may affect seismic hazard by determining whether an earthquake rupture continues propagating, or abruptly stops. However, the long-term pattern of seismicity near fault stepovers and underlying mechanisms of rupture jumping in the context of earthquake cycles are rarely studied. Leveraging a hybrid numerical scheme combining the finite element and the spectral boundary integral methods, FEBE, we carry out fully dynamic simulations of Sequences of Earthquakes and Aseismic Slip (SEAS) for both compressive and tensile stepovers, with off-fault plasticity. We consider a rate-and-state friction law for the fault friction, and pressure sensitive Drucker-Prager plasticity for the off-fault bulk response. We observe that the accumulation of plastic deformation, an indication of off-fault damage, is significantly different in the two cases with more plastic deformation projected in the overlapping region for the tensile stepover. The seismic pattern for a tensile stepover is more complex than for a compressive stepover, and incorporating plasticity also increases complexity, relative to the elastic case. A tensile stepover with off-fault plasticity shows rupture segmentation, temporal clustering, and frequent rupture jumping from one fault to another. These results shed light on possible mechanisms of rupture jumping in fault stepovers as well as the long-term evolution of the fault zone.</p>
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