Aftershocks of the 2013 deep Okhotsk earthquake

TL;DR

This paper investigates the space-time distribution of aftershocks following the 2013 deep Okhotsk earthquake, revealing modulation by Earth's oscillations and analyzing seismic echo phenomena.

Contribution

It introduces a novel analysis of aftershock modulation by Earth's free oscillations and estimates the earthquake source deactivation coefficient.

Findings

Discovered modulation of aftershocks by Earth's toroidal oscillations

Estimated the deactivation coefficient of the earthquake source

Analyzed the round-the-world seismic echo phenomenon

Abstract

Strong deep earthquakes occurred in the Sea of Okhotsk, May 24, 2013 at 05:44 UTC. The magnitude of the earthquake is M = 8.3, the depth of the hypocenter is 629 km. The earthquake was accompanied by the deep-focus aftershocks. The paper is devoted to the study of the space-time properties of aftershocks. An estimate is made of the deactivation coefficient of the earthquake source, which "cools down" after the main shock. The modulation of aftershocks by toroidal oscillations of the Earth was discovered. The questions about the round-the-world seismic echo and the ribbed structure of the spatio-temporal distribution of epicenters are considered. Keywords: Omori law, deactivation coefficient, inverse problem, modulation, free oscillations, round-the-world echo, space-time distribution