Oscillatory regime of aftershocks of the 1984 Ddzhirgatal earthquake: Implications for the internal dynamics of an unstable geological system |
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| Authors: | A A Lukk A V Deshcherevsky |
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| Institution: | (1) Schmidt Institute of Physics of the Earth (IPE), Russian Academy of Sciences (RAS), Bol’shaya Gruzinskaya ul. 10, Moscow, 123995, Russia |
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| Abstract: | On the basis of seismological and geological evidence, the aftereffect region of the strong Dzhirgatal earthquake is localized as a real physical object. The time dependence of the number of aftershocks of this earthquake is best described by a simple hyperbolic law (p = 1, or the Omori law), which is well consistent with the ideas of self-similarity of the material fracture and the development of the seismotectonic process. Features characteristic of the evolution of self-similar systems are recognizable in the dynamics of the aftershock flow and parameters of seismotectonic deformation (STD) calculated from focal mechanisms of aftershocks. The evidence for this is the Feigenbaum inverse cascade in predominant frequencies of variations in the numbers of aftershocks and “catastrophes” in the form of an increase in the variability of STD parameters at the time moments when the corresponding predominant periods abruptly change. In this way, the term “catastrophe,” speculative with respect to the geophysical medium, acquires real meaning as a set of observable changes in the dynamics of STD parameters and the flow of aftershocks that occur over a fairly short time compared to the entire duration of the aftershock series. |
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