Four-stage model of earthquake generation in terms of fracture-induced electromagnetic emissions: a review

K Eftaxias, SM Potirakis, Y Contoyiannis - Complexity of seismic time series, 2018 - Elsevier
Based on a multidisciplinary analysis, the following four-stage model of earthquake (EQ)
dynamics by means of precursory electromagnetic (EM) emissions (EMEs) has been …

Natural time analysis of critical phenomena: The case of pre-fracture electromagnetic emissions

SM Potirakis, A Karadimitrakis… - Chaos: An Interdisciplinary …, 2013 - pubs.aip.org
Criticality of complex systems reveals itself in various ways. One way to monitor a system at
critical state is to analyze its observable manifestations using the recently introduced method …

Recent seismic activity at Cephalonia (Greece): a study through candidate electromagnetic precursors in terms of non-linear dynamics

SM Potirakis, Y Contoyiannis, NS Melis… - Nonlinear Processes …, 2016 - npg.copernicus.org
The preparation process of two recent earthquakes (EQs) that occurred in Cephalonia
(Kefalonia), Greece,((38.22∘ N, 20.53∘ E), 26 January 2014, M w= 6.0, depth∼ 20 km) and …

The Impact of COVID-19 on Weak-Form Efficiency in Cryptocurrency and Forex Markets

PI Zitis, S Kakinaka, K Umeno, SG Stavrinides… - Entropy, 2023 - mdpi.com
The COVID-19 pandemic has had an unprecedented impact on the global economy and
financial markets. In this article, we explore the impact of the pandemic on the weak-form …

Current challenges for pre-earthquake electromagnetic emissions: shedding light from micro-scale plastic flow, granular packings, phase transitions and self-affinity …

K Eftaxias, SM Potirakis - Nonlinear Processes in Geophysics, 2013 - npg.copernicus.org
Are there credible electromagnetic (EM) potential earthquake (EQ) precursors? This a
question debated in the scientific community and there may be legitimate reasons for the …

On the puzzling feature of the silence of precursory electromagnetic emissions

K Eftaxias, SM Potirakis… - Natural Hazards and Earth …, 2013 - nhess.copernicus.org
It has been suggested that fracture-induced MHz–kHz electromagnetic emissions (EME),
which emerge from a few days up to a few hours before the main seismic shock occurrence …

Investigating dynamical complexity and fractal characteristics of Bitcoin/US Dollar and Euro/US Dollar exchange rates around the COVID-19 outbreak

PI Zitis, S Kakinaka, K Umeno, MP Hanias… - Entropy, 2023 - mdpi.com
This article investigates the dynamical complexity and fractal characteristics changes of the
Bitcoin/US dollar (BTC/USD) and Euro/US dollar (EUR/USD) returns in the period before …

[HTML][HTML] Forecasting Forex Market Volatility Using Deep Learning Models and Complexity Measures

PI Zitis, SM Potirakis, A Alexandridis - Journal of Risk and Financial …, 2024 - mdpi.com
In this article, we examine whether incorporating complexity measures as features in deep
learning (DL) algorithms enhances their accuracy in predicting forex market volatility. Our …

Investigating dynamical complexity of geomagnetic jerks using various entropy measures

G Balasis, SM Potirakis, M Mandea - Frontiers in Earth Science, 2016 - frontiersin.org
Recently, many novel concepts originated in dynamical systems or information theory have
been developed, partly motivated by specific research questions linked to geosciences, and …

Sudden drop of fractal dimension of electromagnetic emissions recorded prior to significant earthquake

SM Potirakis, G Minadakis, K Eftaxias - Natural hazards, 2012 - Springer
The variation of fractal dimension and entropy during a damage evolution process,
especially approaching critical failure, has been recently investigated. A sudden drop of …