Abstract
A special experimental technique enabled us to study in detail seismic events on a fault model in a uniaxial stress field. The recording system used made it possible to investigate the radiation pattern for all the events observed including the precise determination of the dislocation origin.
The aim of the present paper is (1) to find the relation between shear and tensile displacements, (2) to check a possible influence of the process of tensile crack generation on the seismic energy release and (3) to compare the seismic regime of a single fault before and after the tensile crack generation, respectively.
Results prove the dominating importance of shear mechanism for the seismic energy release. The tensile displacement can be seismoactive only under special contact conditions on the fault plane.
The existence of tensile cracks at the fault tips changed the pattern of seismic energy radiation. This feature is probably caused by subsequent changes in contact conditions on the fault plane and in the stress field around the fault.
A comparison of some results of the present model experiments with the already published results of geological and seismological measurements and investigations shows the analogous character in laboratory and in nature of the process of tectonic earthquake preparation, the displacement course on the fault during the earthquake and the manner of seismic energy release on faults.
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References
Bakun, W. H. andMcEvilly, T. V. (1984),Recurrence models and Parkfield, California, earthquakes J. Geophys. Res.89, 3051–3058.
Bufe, C. G. andHarsh, P. W. (1977),Steady-state seismic slip—a precise recurrence model. Geophys. Res. Letts.4, 91–94.
Holder, D. W. andNorth, R. J.,Schlieren Methods (NPL, London 1963).
Kasahara, K.,Earthquake Mechanics (Cambridge University Press, 1981).
King, G. andNábělek, J. (1985),The role of bends in faults in the initiation and termination of earthquake rupture: implications for earthquake prediction. Science.228, 984–987.
Košťák, B., Kozák, J. andLokajíček, T. (1984),Contact conditions on seismoactive faults. Pure Appl. Geophys.122, 680–693.
Kozák, J., Lokajíček, T., Šílený, J. Špičák, A. andWaniek, L. (1985),Elementary mechanisms of seismic energy release on single fault, Int. Symp.Physics of Fracturing and Seismic Energy Release. Liblice, Czechoslovakia, October 1985, Abstract No. 25.
Rudajev, V., Teisseyre, R., Kozák, J. andŠílený, J. (1986),New concepts of rockbursts mechanism in coal mines. Pure Appl. Geophys.124, 4/5 (this issue).
Schwartz, D. P. andCoppersmith, K. J. (1984),Fault behaviour and characteristic earthquakes: examples from the Wasatch and San Andreas fault zone. J. Geophys. Res.89, 5681–5698.
Shamina, O. G., Pavlov, A. A., Kozák, J. andWaniek, L. (1977),Laboratory study on seismoactive faults. Publ. Inst. Geophys. Pol. Acad. Sci.117, 129–137.
Šíleny, J. (1982),Seismická aktivita jednoduchého tektonického zlomu, (Seismic activity of a simple tectonic fault), in Czech, Ph. D. Thesis, Geophys. Inst. Czechosl. Acad. Sci., Prague (not published).
Šílený, J., Ritsema, A. R., Czikos, I. andKozák, J. (1986),Do some shallow earthquakes wave a tensile source component? Pure Appl. Geophys.124, 4/5 (this issue).
Šílený, J., Rudajev, V., Lokajíček, T. andKozák, J. (1985),Implosive rock bursts and their laboratory simulation. Acta Montana71, 33–48.
Špičák, A. andLokajíček, T. (1986),Fault interaction and seismicity: laboratory investigation and its seismotectonic interpretation. Pure Appl. Geophys.124, 4/5 (this issue).
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Špičák, A., Lokajíček, T. & Waniek, L. Seismic regime of a single fault model. PAGEOPH 124, 793–810 (1986). https://doi.org/10.1007/BF00879611
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DOI: https://doi.org/10.1007/BF00879611