Omori Law. To the 100th anniversary of death of the famous Japanese seismologist

TL;DR

This paper commemorates Fusakichi Omori's 100th death anniversary by reviewing his contribution to earthquake physics, particularly his formulation of the law describing how aftershock frequency decreases over time after a main earthquake.

Contribution

It provides a modern perspective on Omori's Law and discusses recent research directions related to aftershock evolution and modeling.

Findings

Review of Omori's Law and its historical significance

Discussion of modern aftershock research directions

Application of evolution equations to aftershock modeling

Abstract

One hundred years ago, Fusakichi Omori died. Our paper is dedicated to his memory. Omori made an outstanding contribution to the physics of earthquakes. In 1894 he formulated the law of aftershock evolution. Omori's Law states that after the main shock of an earthquake, the frequency of aftershocks decreases hyperbolically with time. In this paper, we briefly describe one of the directions of modern aftershock research. Keywords: earthquake, mainshock, aftershock, evolution equation, deactivation coefficient, inverse problem, trigger, proper time.