Abstract
Previously, we predicted and then observed in practice the property of aftershocks which consists in the statistically regular clustering of events in time during the first hours after the main shock. The characteristic quasi-period of clustering is three hours. This property is associated with the cumulative action of the surface waves converging to the epicenter, whereas the quasi-period is mainly determined by the time delay of the round-the-world seismic echo. The quasi-period varies from case to case. In the attempt to find the cause of this variability, we have statistically explored the probable dependence of quasi-period on the magnitude of the main shock. In this paper, we present the corresponding result of analyzing global seismicity from the USGS/NEIC earthquake catalog. We succeeded in finding a significant reduction in the quasiperiod of the strong earthquakes clustering with growth in the magnitude of the main shock. We suggest the interpretation of this regularity from the standpoint of the phenomenological theory of explosive instability. It is noted that the phenomenon of explosive instability is fairly common in the geophysical media. The examples of explosive instability in the radiation belt and magnetospheric tail are presented. The search for the parallels in the evolution of explosive instability in the lithosphere and magnetosphere of the Earth will enrich both the physics of the earthquakes and physics of the magnetospheric pulsations.
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Original Russian Text © A.V. Guglielmi, A.D. Zavyalov, O.D. Zotov, I.P. Lavrov, 2017, published in Fizika Zemli, 2017, No. 1, pp. 12–19.
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Guglielmi, A.V., Zavyalov, A.D., Zotov, O.D. et al. Dependence of the aftershock flow on the main shock magnitude. Izv., Phys. Solid Earth 53, 10–17 (2017). https://doi.org/10.1134/S1069351317010086
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DOI: https://doi.org/10.1134/S1069351317010086