Fault constitutive relations inferred from the 2009‐2010 slow slip event in Guerrero, Mexico

Maury, Julie; Aochi, Hideo; Radiguet, Mathilde

doi:10.1002/2014gl060691

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…This supports the initial point of view of the multiscale concept in fracture energy (Ohnaka 2003;Ide and Aochi 2005), where the fracture energy reflects an irregular surface topography (Matsu'ura et al 1992). Nevertheless, the rate effect or healing is oversimplified in our study, since we assume a strictly periodic behavior over slip and the same peak strength, even though the rate effect was weak during SSEs in Guerrero, Mexico (Maury et al 2014). It is unknown whether a small heterogeneity remains in its original state after a large slip event.…”

Section: Discussionmentioning

confidence: 97%

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Role of multiscale heterogeneity in fault slip from quasi-static numerical simulations

Aochi

Ide

2017

Earth Planets Space

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Quasi-static numerical simulations of slip along a fault interface characterized by multiscale heterogeneity (fractal patch model) are carried out under the assumption that the characteristic distance in the slip-dependent frictional law is scale-dependent. We also consider slip-dependent stress accumulation on patches prior to the weakening process. When two patches of different size are superposed, the slip rate of the smaller patch is reduced when the stress is increased on the surrounding large patch. In the case of many patches over a range of scales, the slip rate on the smaller patches becomes significant in terms of both its amplitude and frequency. Peaks in slip rate are controlled by the surrounding larger patches, which may also be responsible for the segmentation of slip sequences. The use of an explicit slip-strengthening-then-weakening frictional behavior highlights that the strengthening process behind small patches weakens their interaction and reduces the peaks in slip rate, while the slip deficit continues to accumulate in the background. Therefore, it may be possible to image the progress of slip deficit at larger scales if the changes in slip activity on small patches are detectable.

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Section: Discussionmentioning

confidence: 97%

“…We note that our fixed �τ may be smaller than that inferred for standard earthquakes. For example, Gao et al (2012) infer a range between 0.01 and 1 MPa from SSEs in Cascadia, and Maury et al (2014) infer a value of ~0.1 MPa from the large 2010 SSE in Guerrero, Mexico. We fix a value of �τ = 0.5 MPa for our study.…”

Section: Numerical Methods and Parametersmentioning

confidence: 99%

Role of multiscale heterogeneity in fault slip from quasi-static numerical simulations

Aochi

Ide

2017

Earth Planets Space

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“…In our numerical calculations, we test stiffness values of k 0 = 10 5 , 10 6 , and 10 7 Pa/m, corresponding to W = 300, 30, and 3 km, using μ = 30 GPa. Geodetic measurements of slow slip events have implied that the actual stiffness in deep subduction zone is at 5 × 10 5 Pa/m [ Maury et al ., ]. The recurrence distance of frictional parameters L is 60 m in our calculations.…”

Section: Methodsmentioning

confidence: 99%

Slip‐behavior transitions of a heterogeneous linear fault

Yabe

Ide

2017

JGR Solid Earth

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Geological faults have frictional heterogeneity. Here we investigate the slip behavior of such heterogeneous faults in the simplest situation, simulating antiplane shear slip along an infinite linear fault in a 2‐D elastic model space, subjected to constant loading by external stresses characterized by stiffness and plate‐motion velocity. The fault is discretized into many subfaults, each of which has either a velocity‐weakening (VW) or velocity‐strengthening (VS) friction law. We vary the proportion of the fault that is VW, revealing several different regimes of slip behavior. The first regime boundary, where stick‐slip behavior is initiated, is located at the proportion of VW zones such that each VW zone reaches its nucleation size. The other boundary is located where the spatially averaged a − b value of the rate and state friction law is close to zero. Below this density, the VW zone slips seismically, whereas the VS zone shows afterslip. In contrast, above this density, the entire fault slips simultaneously at the seismic slip velocity. We observe transitional behavior at the second boundary, where relatively slower deformation dominates. We also explore the slip behavior of faults using Cantor‐set distributions of frictional parameters. We propose that frictional heterogeneity on the fault may explain not only the diversity of seismic phenomena but also the observed scaling of frictional parameters, such as slip‐weakening distance or the fracture energy of ordinary earthquakes.

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“…The detailed space-time evolution of slow slip may help improve our understanding of the relationship between slow slip and accompanying seismic events. Furthermore, the evolution of slip and stress during SSEs can constrain the fault constitutive relations and frictional properties (Maury et al, 2014;Miyazaki et al, 2006), which are vital to understand the mechanisms governing SSEs.…”

Section: Introductionmentioning

confidence: 99%

Variability of the Space‐Time Evolution of Slow Slip Events Off the Boso Peninsula, Central Japan, From 1996 to 2014

Fukuda

2018

JGR Solid Earth

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Global Navigation Satellite System data are inverted to investigate the space‐time evolution of five Mw 6.6–6.7 slow slip events (SSEs) off the Boso Peninsula, central Japan, in 1996, 2002, 2007, 2011, and 2013–2014. Our analyses reveal that the nucleation style and space‐time evolution of slip vary among the five SSEs. The 2002, 2007, and 2011 SSEs nucleated more rapidly, with moment accelerations higher than those of the 1996 SSE by a factor of ∼2–6, and higher than those of the 2013–2014 SSE by an order of magnitude. Furthermore, the 2002, 2007, and 2011 SSEs exhibited more rapid temporal variations in their slip and moment rates and showed larger seismic moments and higher maximum slip rates than the 1996 and 2013–2014 SSEs, suggesting that the overall evolution of the SSEs is correlated with the nucleation style. The along‐strike expansion/propagation of slip is identified for the five SSEs, revealing that the expansion/propagation patterns vary from event to event. The earthquake swarms accompanying the SSEs occurred near the downdip edge of high‐slip‐rate areas, and the seismicity migrated during slow slip with directions and speeds similar to those of the slip expansion/propagation. These space‐time correlations between seismicity and slow slip suggest that the earthquake swarms were triggered by stress changes due to slow slip. The relative timing between the onsets of the SSEs and their associated seismicity varies from event to event and appears to be correlated with the nucleation style of the SSEs.

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Fault constitutive relations inferred from the 2009‐2010 slow slip event in Guerrero, Mexico

Cited by 9 publications

References 18 publications

Role of multiscale heterogeneity in fault slip from quasi-static numerical simulations

Role of multiscale heterogeneity in fault slip from quasi-static numerical simulations

Slip‐behavior transitions of a heterogeneous linear fault

Variability of the Space‐Time Evolution of Slow Slip Events Off the Boso Peninsula, Central Japan, From 1996 to 2014

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