An experimental study of triggered stick-slip

Sobolev, G. A.; Spetzler, H.; Koltsov, A. V.; Cheldize, T.

doi:10.1007/bf00876872

Cited by 20 publications

(10 citation statements)

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“…19. The experiment was carried out as follows (Sobolev et al, 1993): Constant lateral compression stress G was applied and the vertical load F was increased gradually. An impact (elastic shock) was made on the model at different levels of F ; as a result, a dynamic displacement (stick-slip) occurred, subject to impact force and F value, followed by partial loss of F .…”

Section: Discussionmentioning

confidence: 99%

Seismicity dynamics and earthquake predictability

Соболев

2011

Nat. Hazards Earth Syst. Sci.

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Abstract. Many factors complicate earthquake sequences, including the heterogeneity and self-similarity of the geological medium, the hierarchical structure of faults and stresses, and small-scale variations in the stresses from different sources. A seismic process is a type of nonlinear dissipative system demonstrating opposing trends towards order and chaos. Transitions from equilibrium to unstable equilibrium and local dynamic instability appear when there is an inflow of energy; reverse transitions appear when energy is dissipating. Several metastable areas of a different scale exist in the seismically active region before an earthquake. Some earthquakes are preceded by precursory phenomena of a different scale in space and time. These include long-term activation, seismic quiescence, foreshocks in the broad and narrow sense, hidden periodical vibrations, effects of the synchronization of seismic activity, and others. Such phenomena indicate that the dynamic system of lithosphere is moving to a new state -catastrophe. A number of examples of medium-term and short-term precursors is shown in this paper. However, no precursors identified to date are clear and unambiguous: the percentage of missed targets and false alarms is high. The weak fluctuations from outer and internal sources play a great role on the eve of an earthquake and the occurrence time of the future event depends on the collective behavior of triggers. The main task is to improve the methods of metastable zone detection and probabilistic forecasting.

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Section: Discussionmentioning

confidence: 99%

Seismicity dynamics and earthquake predictability

Соболев

2011

Nat. Hazards Earth Syst. Sci.

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“…One sup position looks justified: all other things being equal, the probability of generating the dynamic propagation of a fault (i.e., an earthquake) increases with increas ing action of the trigger. In particular, this was shown in a laboratory experiment that modeled a smooth fault [Sobolev et al, 1993;Sobolev and Ponomarev, 2003] where the probability of generating an unstable sliding of fault walls (stick slip) is to a first approxima tion described by the relation…”

Section: Discussion Of Resultsmentioning

confidence: 95%

The effects of cyclones on seismicity

Соболев

Zakrzhevskaya

Sobolev

2012

J. Volcanolog. Seismol.

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This study is concerned with the effects of powerful Pacific cyclones on the seismicity of Kam chatka, Japan, and the Philippines. We used complete seismological catalogs for these regions that span a few tens of years. It was found that the cyclones that originate from the western Pacific generally do not exert a significant triggering effect on the seismicity of these three regions, at least in the short term, during a few weeks. The ground motion generated by cyclones, which might be treated as a trigger, does not have ampli tudes above those in the motion due to numerous local earthquakes of moderate magnitudes (~4-5) and larger teleseismic earthquakes.

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“…However such processes are not universal enough and cannot be accepted for the basis of the model of acoustic emissive responses excitement in the materials with various physicochemical and rheological properties by themselves. At the same time the trigger influence of weak vibrations on inelastic deformation has such universality that it is established and well explored at the various scales from centimetric (laboratory) to one-kilometer-wide and more (natural) (Mirzoev,et al, 1991;Sobolev et al, 1993;Belyakov, et al, 1999;Sobolev & Ponomarev, 2003;Kocharyan & Spivak, 2003;Kocharyan et al, 2006). This allows a qualitative model of the possible mechanism of AE activation of loading rock specimens.…”

Section: Discussion and The Model Of Mechanism Of Electric Pulses Infmentioning

confidence: 99%