Seismic hazard indicators in Japan based on seismic noise properties

Abstract

AbstractThe seismic noise recorded at the network of stations in Japan for more than 26 years (1997 - March 2023) is being investigated. The article is a continuation of the number of works in which the analysis was performed for 1997 - March 2021. New data for 2 years of follow-up observations, combined with a new approach to their analysis, provided additional opportunities to test a number of hypotheses regarding the presence of features in the properties of seismic noise that precede the release of seismic energy. The analysis is based on the use of the wavelet-based Donoho-Johnstone index, as a property of noise waveforms, the use of an auxiliary network of reference points, the estimation of spatial correlations of noise properties, and the relationship of the seismic noise response to the irregular rotation of the Earth with the flow of seismic events in the vicinity of the Japanese Islands by using a parametric model of interacting point processes.