Tricritical crossover in earthquake preparation by analyzing preseismic electromagnetic emissions

dc.contributor.author	Κοντογιάννης, Ιωάννης	el
dc.contributor.author	Ποτηράκης, Στέλιος	el
dc.contributor.author	Ευταξίας, Κωνσταντίνος	el
dc.contributor.author	Κοντογιάννη, Λ.	el
dc.date.accessioned	2015-06-14T23:01:58Z
dc.date.available	2015-06-14T23:01:58Z
dc.date.issued	2015-06-15
dc.identifier.uri	http://hdl.handle.net/11400/16079
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://www.sciencedirect.com	el
dc.subject	Phase transitions in earthquakes
dc.subject	Fracture-induced electromagnetic emissions
dc.subject	Time-series analysis
dc.subject	Μεταβάσεις φάσης σε σεισμούς
dc.subject	Ανάλυση χρονολογικών σειρών
dc.subject	Κάταγμα που προκαλείται από τις ηλεκτρομαγνητικές εκπομπές
dc.title	Tricritical crossover in earthquake preparation by analyzing preseismic electromagnetic emissions	en
heal.type	journalArticle
heal.classification	Technology
heal.classification	Electronics
heal.classification	Τεχνολογία
heal.classification	Ηλεκτρονική
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85042383
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Ηλεκτρονική
heal.identifier.secondary	doi:10.1016/j.jog.2014.09.015
heal.language	en
heal.access	campus
heal.publicationDate	2015-03
heal.bibliographicCitation	Contoyiannis, Y., Potirakis, S., Eftaxias, K. and Contoyianni, L. (2015) Tricritical crossover in earthquake preparation by analyzing preseismic electromagnetic emissions. "Journal of Geodynamics", 84, p.40-54	en
heal.abstract	Fracture-induced electromagnetic emissions (EME) have been observed from the laboratory to the geophysical scale permitting the monitoring of damage evolution. It has been shown that the first appearing MHz EME presents second-order phase transition characteristics and has been attributed to the fracture process of the heterogeneous medium surrounding the family of strong entities (asperities) distributed along the fault sustaining the system. The finally, abruptly, emerged strong avalanche-like kHz EME do not present any footprint of a second-order transition in equilibrium, while they have been attributed to the fracture of the family of the, relatively homogeneous, asperities themselves. In the present work we show that between these two stages of the fracture process, an intermediate stage exists. This is reflected to the tricritical behavior which is revealed for the kHz EME just before the emergence of the strong avalanche-like kHz emission. The identification of this tricritical behavior is performed using the method of critical fluctuations (MCF). The results obtained for the kHz time-series are compatible with the results obtained for an introduced model map which describes the tricritical crossover. A Hurst exponent analysis shows that this crossover indicates the limit of an antipersistence dynamics. It is finally shown, by the MCF, that first-order phase transition characterizes the final rupture of the asperities.	en
heal.publisher	Elsevier	en
heal.journalName	Journal of Geodynamics	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true