Latest aspects of earthquake prediction in Greece based on seismic electric signals, II

Varotsos, P.; Alexopoulos, K.; Lazaridou, M.

doi:10.1016/0040-1951(93)90055-o

Cited by 306 publications

(156 citation statements)

References 22 publications

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“…A number of recent publications (Dologlou, 2008a(Dologlou, , b, 2009(Dologlou, , 2010(Dologlou, , 2012a showed an interconnection between dynamic parameters of large earthquakes and features of their precursory seismic electric signal, in terms of criticality. Seismic electric signals, termed as SESs, are found to precede large earthquake in Greece (Varotsos and Alexopoulos, 1984a, b;Varotsos et al, 1986Varotsos et al, , 1993 and Japan (Uyeda et al, 2009. SESs are detected by burring two electrodes at a depth of around two metres and a distance of some metres to few kilometres.…”

Section: Introductionmentioning

confidence: 99%

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Features of criticality in precursory seismic electric signals and earthquakes in Greece

Dologlou

2013

Nonlin. Processes Geophys.

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Very recently the recordings of precursory seismic electric signals (SESsf) in the island of Kozu-shima, Japan, have been reported, and their interrelation with subsequent earthquakes was shown to be beyond chance. Almost simultaneously, the recording of SES activity in northern Greece was also reported, which was followed by a magnitude 5.7 earthquake in northern Greece. These facts strengthen the aspects on the precursory nature of SESs and also enable the updating of a previously found power law relation between the earthquake stress drop and the lead time of SESs. They led to an exponent of 0.330, which falls in the range of critical exponents for fracture. The stability of this exponent, which results from a large amount of data during the last 30 yr, is remarkable and may thus confirm features of criticality in the pre-seismic region after the SES emission. The underlying physics are also discussed

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Section: Introductionmentioning

confidence: 99%

“…1st, 2nd, etc). On the other hand the selectivity effect that reflects the ability of a SES station to be sensitive to some specific areas and remain inactive to others even at closer distances (Varotsos and Lazaridou, 1991;Varotsos et al, 1993) contributes to the determination of the epicentre of the impending earthquake.…”

Section: Introductionmentioning

confidence: 99%

Features of criticality in precursory seismic electric signals and earthquakes in Greece

Dologlou

2013

Nonlin. Processes Geophys.

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“…The polar distance ranges from tens to hundreds of meters. Moreover, 2-4 pairs of 1-10 km-long pole distance can be laid with appropriate configuration of their electrodes (Varotsos et al 1991(Varotsos et al , 1993. In 1990, the Sino-French Electromagnetic Cooperation Project established the observing devices at the Songshan (SHN) station in Tianzhu, Gansu, as shown in Fig.…”

Section: Characteristics Of Trend Variation In the Spontaneous Field mentioning

confidence: 99%

Correlation between abnormal trends in the spontaneous fields of tectonic plates and strong seismicities

Tan

Xin

2017

Earthq Sci

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Tectonic activities, electrical structures, and electromagnetic environments are major factors that affect the stability of spontaneous fields. The method of correlating regional synchronization contrasts (CRSC) can determine the reliability of multi-site data trends or shortimpending anomalies. From 2008 to 2013, there were three strong earthquake cluster periods in the North-South seismic belt that lasted for 8-12 months. By applying the CRSC method to analyze the spontaneous field E SP at 25 sites of the region in the past 6 years, it was discovered that for each strong earthquake cluster period, the E SP strength of credible anomalous trends was present at minimum 30% of the stations. In the southern section of the Tan-Lu fault zone, the E SP at four main geoelectric field stations showed significant anomalous trends after June 2015, which could be associated with the major earthquakes of the East China Sea waters (M S 7.2) in November 2015 and Japan's Kyushu island (M S 7.3) in April 2016.

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“…The main aim of the work is to investigate the emergence of trigger events in hierarchical fault systems (Dominguez et al, 2012) due to variation of seismicity patterns through evolutionary optimization technique of ant colony framework. The idea of the seismogenic crust to have seismic zones or basins that trigger large motions is a conclusive evidence of the phenomena conducive stress accumulates in critical state (Evison and Rhoades, 2004;Scholz, 1991) based on acoustic emissions for seismic electrical signals (Varotsos and Alexopoulos, 1984 a, b;Varotsos et al, 1993).The proposed mechanism involves the interaction of three processes: initialization parameters for the ants, ants build solutions to update the pheromone and the ant identifies the unique path to the maxima or minima existing within the stress-strain framework. It is assumed that every ant has knowledge of the global coordinating plane and has two functions for n-dimensional system as the ant moves in terms of two coordinates for exploration and exploitation in search of the global minima for rest.…”

Section: General Introductionmentioning

confidence: 99%

Identification of Collision Mechanism at Seismogenic Fault Interface Using Finite Element Analysis Involving Plate Bending Applications Using Ant Colony Optimization

Dutta

Mishra

2017

Journal of Applied Engineering Sciences

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ABSTRACT:Understanding space-time correlation in equilibrium matrix when force of collision involving earthquake stress strain interaction. The proposed study shows that non-linear dynamics of earthquake behaviour simulated with ant colony optimization in short timescale deformation by analysis of the stiffness matrix and the stress strain interaction process of the rock pattern. An improved ant colony optimization combined with local search is proposed for solving this complex optimization problem of finding trigger zones for earthquake occurrences. The disturbances at trigger basins for any system cause the collapse of a subsystem leading to stress evolution and slip due to strain nucleation. The stress strain network based on redistribution of stress accumulation are discretized into four states of low stress and strain and a finite element model is established to identify vertices for the stress-strain component and edges for global coupling effects have been constructed for dynamic monitoring of stress and strain behaviour at triggering zones. In this paper, an efficient algorithm is developed for the formation of null basis of triangular and rectangular plate bending finite element models, corresponding to highly sparse flexibility matrices. Triggering basins serve as harbingers of large earthquake where stress-strain interactions have been analyzed by the quasi-static mechanics of seismic precursory stress-strain propagation in the crustal lithosphere. The simulation framework shows that with time, spatial triggering points as stress varies from one point to another to identify the external influences for the body forces and the surface forces for geodynamic frameworks.

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Latest aspects of earthquake prediction in Greece based on seismic electric signals, II

Cited by 306 publications

References 22 publications

Features of criticality in precursory seismic electric signals and earthquakes in Greece

Features of criticality in precursory seismic electric signals and earthquakes in Greece

Correlation between abnormal trends in the spontaneous fields of tectonic plates and strong seismicities

Identification of Collision Mechanism at Seismogenic Fault Interface Using Finite Element Analysis Involving Plate Bending Applications Using Ant Colony Optimization

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