Two Memorable Dates in Seismology: Conclusion and References | HackerNoon
Briefly

At the beginning of the last century, Hirano drew attention to the fact that the Omori formula does not always satisfactorily describe the flow of aftershocks, and proposed his version of the law of evolution.
The results obtained by Utsu aroused keen interest, were continued, and generated extensive literature for constructing a phenomenological theory of aftershocks.
Within the framework of the phenomenological approach to the physics of aftershocks, it was possible to obtain many previously unknown results.
The work was carried out according to the plan of state assignments of Schmidt Institute of Physics of the Earth, Russian Academy of Sciences.
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