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Three Problems in Aftershock Physics

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Abstract

In recent years three new problems emerged in aftershock physics. We shall refer to these problems in a preliminary way as the dynamic, the inverse, and the morphological problem. They have been distinctly stated, partially solved, and have a fundamental character. The dynamic problem consists in searching for the effect of a circumnavigating seismic echo that occurs after the main shock of an earthquake. According to theory, the convergent seismic surface wave due to a main shock returns to the epicenter about 3 h later and initiates the occurrence of a large aftershock. The results of our study corroborate this theory. The second problem consists in an adequate description of the average evolution of the aftershock process. We introduce a new quantity, a deactivation coefficient for an earthquake source. It describes the “cooling” of the source after the main shock, and we proposed an equation to describe aftershock evolution. We used the evolutionary equation to formulate and solve the inverse problem in earthquake source physics, resulting in an Atlas of Aftershocks, which demonstrates the diversity of ways for the evolution of the deactivation coefficient. The third fundamental problem consists in modeling the spatial and space–time distribution of aftershocks. The solution enhances our understanding of the structure and dynamics of an earthquake source. We also discuss in great detail some other interesting problems in aftershock physics.

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ACKNOWLEDGMENTS

We are deeply indebted to A.L. Buchachenko, B.I. Klain, and A.S. Potapov for numerous fruitful discussions.

Funding

This work was supported by the Russian Foundation for Basic Research, project nos. 18-05-00096 and 19-05-00574, by the Presidium of the Russian Academy of Sciences, Program 12, and by state assignments at the Institute of Physics of the Earth, Russian Academy of Sciences.

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Correspondence to A. D. Zavyalov.

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Translated by A. Petrosyan

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Zavyalov, A.D., Guglielmi, A.V. & Zotov, O.D. Three Problems in Aftershock Physics. J. Volcanolog. Seismol. 14, 341–352 (2020). https://doi.org/10.1134/S0742046320050073

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