Study of acoustic emission signals during fracture shear deformation

Остапчук, А. А.; Павлов, Д. В.; Марков, В. К.; Krasheninnikov, Alexey V.

doi:10.1134/s1063771016040138

Cited by 17 publications

(7 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AE experiments reproduce qualitatively the main statistical laws that describe natural seismicity (Gutenberg-Richter law, Omori law, inverse Omori law) (Lei, 2003;Johnson et al, 2013;Lherminier et al, 2019;Ostapchuk et al, 2019). Nucleation of slip events in laboratory is accompanied by variations of scaling properties of AEs (Goebel et al, 2013;Riviere et al, 2018), alterations of elastic/seismic wave properties (Hedayat et al, 2014;Shreedharan et al, 2021) and seismic quiescence (Ostapchuk et al, 2016). The similarity of recurrent fast and slow earthquakes has already been demonstrated (Hulbert et al, 2019).…”

Section: Introductionmentioning

confidence: 53%

“…The findings probably point to formation and evolution of two structural subsystems. When the force chains (loaded grain conglomerates with limited sizes) are destroyed, the high-frequency AEs with harsh onsets are emitted (Hadda et al, 2015;Ostapchuk et al, 2016;Gao et al, 2019). The uniformity of distribution for WI < 0.1 points to formation of stressed grain clusters of limited size which have approximately equal sizes (Hadda et al, 2015) (Figure 5B).…”

Section: Discussionmentioning

confidence: 99%

“…It seems likely that the waveform of an AE points to the mechanism and intensity of the evolution process inside the fault (Shiotani et al, 2001;Zigone et al, 2011;Ostapchuk et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic Emission Reveals Multiple Slip Modes on a Frictional Fault

et al. 2021

View full text Add to dashboard Cite

The spectrum of fault slip modes spans a continuum from fast ruptures to slow slip events. The nucleation of a certain slip mode is governed by the frictional heterogeneity of fault interface and the rheological fault stiffness. There is a mounting evidence that a single fault can host multiple slip modes. In laboratory experiments we study acoustic emission (AE) initiated by a sliding frictional fault and focus our attention on gouge-filled faults hosting multiple slip modes. Deformation experiments were performed on a slider model setup with a precise control of mechanical parameters and monitoring the acoustic signal in the frequency range of 20–80 kHz. We have shown that the cumulative AE energy linearly depends on block displacement. Besides that, there is a high inverse correlation (-0.94) between fault friction and b-value of frequency-amplitude distribution of AE in the performed experiments. Provided that velocity weakening is specific for the fault interface, the self-organization of a gouge-filled fault at the micro scale is the key parameter that controls the frictional behavior of fault hosting multiple slip modes. Resting on a quantitative categorization of AE waveforms, two AE subpopulations have been distinguished. One of them manifests as AEs with harsh onsets. The second one exhibits a gradual amplitude rise and tremor-like waveforms. A longer duration of the intergrain rupture is specific for the second AE subpopulation. During a laboratory seismic cycle, the first AE subpopulation retains parameters, while the second one exhibits a pronounced cyclic recurrence of b-value. The b-value of the second subpopulation gradually decreases before slip events and recovers after them. Two AE subpopulations, probably, point to the coexistence of two dynamic subsystems. The revealed precursory changes of AE subpopulations are common for the entire spectrum of slip modes. We speculate on the unity of underlying mechanisms of different slip modes.

show abstract

Section: Introductionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic Emission Reveals Multiple Slip Modes on a Frictional Fault

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The emergence of a certain slip mode is determined not only by the grain geometry, but also by their chemical and physical properties. For example, for monocomponent low dispersion fillers consisting of angulated grains with ionic bonds between molecules (sodium chloride, corundum, magnesium oxide) realization of dynamic failures is much more probable than for fillers with covalent or metallic bonds between molecules (dry quartz sand, graphite and others) under similar loading parameters [95]. Probably the ionic bonds provide a stronger adhesive interaction of the filler grains in contact.…”

Section: Generating Different Slip Modes In Laboratory Experimentsmentioning

confidence: 99%

“…During the slip episode a reorganization of the meso-scale fault structure takes place, manifested in intergrain slipping. [95,100]. At the stage of rest, when velocity is low, the intergrain contact dewets, which is accompanied by the accumulation of excess liquid in the pore space.…”

Section: Generating Different Slip Modes In Laboratory Experimentsmentioning

confidence: 99%

Fault Sliding Modes—Governing, Evolution and Transformation

Kocharyan

Остапчук

Павлов

2020

Springer Tracts in Mechanical Engineering

View full text Add to dashboard Cite

A brief summary of fundamental results obtained in the IDG RAS on the mechanics of sliding along faults and fractures is presented. Conditions of emergence of different sliding regimes, and regularities of their evolution were investigated in the laboratory, as well as in numerical and field experiments. All possible sliding regimes were realized in the laboratory, from creep to dynamic failure. Experiments on triggering the contact zone have demonstrated that even a weak external disturbance can cause failure of a “prepared” contact. It was experimentally proven that even small variations of the percentage of materials exhibiting velocity strengthening and velocity weakening in the fault principal slip zone may result in a significant variation of the share of seismic energy radiated during a fault slip event. The obtained results lead to the conclusion that the radiation efficiency of an earthquake and the fault slip mode are governed by the ratio of two parameters—the rate of decrease of resistance to shear along the fault and the shear stiffness of the enclosing massif. The ideas developed were used to determine the principal possibility to artificially transform the slidding regime of a section of a fault into a slow deformation mode with a low share of seismic wave radiation.

show abstract