Piezo stimulated currents in marble samples

dc.contributor.author	Σταύρακας, Ηλίας	el
dc.contributor.author	Αναστασιάδης, Κίμων	el
dc.contributor.author	Τριάντης, Δήμος Α.	el
dc.contributor.author	Βαλλιανάτος, Φίλιππος	el
dc.date.accessioned	2015-04-14T17:19:23Z
dc.date.available	2015-04-14T17:19:23Z
dc.date.issued	2015-04-14
dc.identifier.uri	http://hdl.handle.net/11400/8372
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.egu.eu/	en
dc.subject	Penteli Mountain
dc.subject	Weak electric currents
dc.subject	Microcracks
dc.subject	Πεντέλη
dc.subject	Ασθενή ηλεκτρικά ρεύματα
dc.subject	Μικρορωγμές
dc.title	Piezo stimulated currents in marble samples	en
heal.type	journalArticle
heal.secondaryTitle	precursory and concurrent-with-failure signals	en
heal.classification	Technology
heal.classification	Electrical engineering
heal.classification	Τεχνολογία
heal.classification	Ηλεκτρολογία Μηχανολογία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://zbw.eu/stw/descriptor/18426-4
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Ηλεκτρολογία Μηχανολογία
heal.language	en
heal.access	free
heal.publicationDate	2003
heal.bibliographicCitation	STAVRAKAS, I., ANASTASIADIS, C., TRIANTIS, D.A. & VALLIANATOS, F. (2003). Piezo stimulated currents in marble samples: precursory and concurrent-with-failure signals . Natural Hazards and Earth System Science. [Online] 3. p.243-247. Available from: http://www.nat-hazards-earth-syst-sci.net/[Accessed 21/10/2002]	en
heal.abstract	The Earth’s electric field transient variations are promising candidates of earthquake precursors. In order to study the physical mechanisms of such precursory signals, laboratory experiments of uniaxial compression were carried out. More specifically the behaviour of stressed marble samples from Penteli Mountain was investigated. The samples were subjected to a time-varying uniaxial compression at both variable and constant stress rates. During the first set of experiments weak electric currents were detected during pressure variations. Such Piezo Stimulated Currents (PSC) were detected while stress steps, both positive and negative were applied, the maximum stress never being greater than the elasticity limit. During the second set of experiments stress was applied at a constant rate starting from zero-stress and ending in fracture. In the region beyond the elastic limit a PSC was detected which after reaching a peak suffered a reversal in its polarity just before fracture. In a third set of experiments the same procedure was applied to previously structurally damaged samples taking care not to fracture them. In all cases the PSC followed the variation of stress and moreover it was observed that a linear relationship existed between the PSC maxima and the corresponding stress-rate maxima. The mechanism responsible for the described phenomena can be ascribed to the Moving Charged Dislocations model.	en
heal.publisher	European Geosciences Union	en
heal.journalName	Natural Hazards and Earth System Sciences	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true