Detection and interpretation of precursory magnetic signals preceding October 30, 2020 Samos earthquake

Discrete scaling in earthquake precursory phenomena :

We analyze the ion concentrations of groundwater issuing from deep wells located near the epicenter of the recent earthquake of magnitude 6:9 near Kobe, Japan, on January 17, 1995. These concentrations are well tted by log-periodic modulations around a leading power law. The exponent (real and imaginary parts) is very close to those already found for the ts of precursory seismic activity for Lo...

Physical Models of Earthquake Instability and Precursory Processes

This paper selectively reviews physical models of earthquake instability. In these models, instability arises as a result of interaction of a fault constitutive relation with deformation of the surrounding material that occurs in response to remote tectonic loading. In contrast to kinematic models in which the fault slip is imposed, it is calculated in physical models and, consequently, these m...

Theory of Precursory Processes in the Inception of Earthquake Rupture

The paper reviews models for inelastic deformation processes preceding earthquake rupture in brittle, natural rock masses. The discussion is organized around three types of failure models: (i) localization bifurcations, whereby a uniform or nearly uniform pattern of deformation gives way to highly localized deformations within a fault zone; (ii) non-homogeneous deformations due to an inclusion-...

Cover 17-5 October 2020

New Evidence of Earthquake Precursory Phenomena in the 17

Significant advances, both in the theoretical understanding of rupture processes in heterogeneous media and in the methodology for characterizing critical behavior, allows us to reanalyze the evidence for criticality and especially log-periodicity in the previously reported chemical anomalies that preceded the Kobe earthquake. − 3 and SO −− 4) concentrations of groundwater issued from deep well...