Abstract
Some regularities in seismo acoustic mode have been studied during the preparation and development of dynamic events generated during the deformation at different scales in a geophysical field. The time-space behavior of certain auto similarity parameters: the slope of the recurrence plot c, the fractal dimension of the hypocenters set D, the relationship D-3c and the crack concentration parameter Ksr in laboratory and field experiments in Algerian seismoactive zone have been analyzed as well. Precursory stage and local failure evolution in rock samples and in natural conditions were studied. It is shown that the regularities in the behavior of the parameters under study do not qualitatively depend on the dimension of the object being loaded. The quoted examples above speak of inhomogeneity and self-similarity of seismicity distribution in space-time. This suggests that the evolution of cracking process at different scales, from rock samples to Earth crust, is controlled by the same physical mechanism. The further development of these studies consolidates the physical basis of the prediction of the dynamic events.
Highlights
A geophysical field is a set of geophysical properties of rock at a level ranging from a rock sample scale to a planet scale [Sadovsky and Pisarenko 1991, Lockner et al 1992, Baddari and Frolov 1997, Sobolev and Ponomarev 2003, Vettegren et al 2004, Thompson et al 2006, Eftaxias et al 2007, LiakopoulouMorris et al 2007, Smirnov et al 2010]
In phase II (t = 19800-27600 s), we have a gradual concentration of the sources of the acoustic event in the small domain of the central part to the left of the block – formation of a fractal structure of acoustic regime that leads to an increasing mutual effect of the acoustic events
The process of rock failure at different scales observed in the laboratory and the field experiments gives rise to a fractal structure that is due to the active interactions of cracks
Summary
A geophysical field is a set of geophysical properties of rock at a level ranging from a rock sample scale to a planet scale [Sadovsky and Pisarenko 1991, Lockner et al 1992, Baddari and Frolov 1997, Sobolev and Ponomarev 2003, Vettegren et al 2004, Thompson et al 2006, Eftaxias et al 2007, LiakopoulouMorris et al 2007, Smirnov et al 2010]. The seismic structure is distinguished by its auto-similarity property in the spatial, temporal and energetic domains [Gutenberg 1956, Smirnov et al 1995, Baddari et al 1996, Baddari et al 1999, Sobolev and Ponomarev 1999, Zang et al 2000, Kanamori 2004, Lei and Satoh 2007, Kuksenko et al 2009]. The nature of this structure is not defined clearly in situ because of a lack of reliable experimental data.
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