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dc.contributor.authorallNardi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.authorallCaputo, M.; Department of Physics, University of Rome ‘‘LaSapienza’’, Rome, Italy-
dc.description.abstractThe present note shows that the rock mass under stress and strain generates an ELF and VLF emission (EME) associated to the fracturing phenomena. On uniaxial stress this emission show two different modes. A disorderly succession of clustering EM pulses (DIS) is associated with the acoustics emission of fracturing. It is always manifested, culminates with the rupture and begins just before the 50% of the time necessary to break the rock with an constant increasing stress. In some cases, this phenomenon is preceded by a more orderly and homogeneous sequence of pulses EM (OIS), in this case not associated with the acoustics. The presence of water saturation influences the DIS EM emission. From our experimental observations results that the emission in the ELF and VLF bands is independent from the type of rock, which however condition the deformation history, and form the structural characteristics of the material. In a quarry have observed a similar phenomenon also on large stone masses under strain. These characteristics of the EME may be observed at great distances to monitor the preparation of an Earthquake; in fact radio waves as well as acoustic waves have their maximum propagation at the low frequency band.en
dc.publisher.nameElsevier Ltden
dc.relation.ispartofInternational journal of Rock Mechanics & Mining Sciencesen
dc.relation.ispartofseries5 / 46 (2009)en
dc.subjectVLF electromagnetic emissionsen
dc.subjectfracturing of rocksen
dc.subjectuniaxial compressionen
dc.subjectseismic precursorsen
dc.titleMonitoring the mechanical stress of rocks through the electromagnetic emission produced by fracturingen
dc.description.pagenumber940 - 945en
dc.subject.INGV04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocksen
dc.subject.INGV04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methodsen
dc.subject.INGV04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniquesen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniquesen
dc.relation.references[1] Caputo M. Sismologia E Segnali Precursori Dei Terremoti. Italy: Bologna Calderini; 1987. [2] Rikitake T. Previsione Dei Terremoti. Palermo: Libreria Dario Flaccovio Editricel; 1986. [3] Fidani C. Ipotesi Sulle Anomalie Elettromagnetiche Associate Ai Terremoti. L’Aquila: Libreria Universitaria Benedetti; 2005. [4 Galli I. Raccolta e classificazione di fenomeni luminosi osservati nei terremoti. Boll Soc Ital Sismol 1910; 14: 221–448. [5] Yoshida S, Ogawa T. Electromagnetic emissions from dry and wet granite associated with acoustic emissions. J Geophys Res 2004;109:B09204. [6] Freund FT, Takeuchi A, Lau BWS. Electric currents streaming out of stressed igneous rocks— a step towards understanding pre-earthquake low frequency EM emissions. PhysChemEarth 2006;31:389–96. [7] Soloviev SP, Sweeney JJ. Generation of electric and magnetic field during detonation of high explosive charges in boreholes.J Geophys Res 2005;110:B01312. [8] Takeuchi A,Lau BWS, Freund FT. Current and surface potential induced by stress-activated positive holes in igneous rocks. Phys Chem Earth 2006;31:240–7. [9] St-Laurent F,Derr JS,Freund FT. Earthquake lights and the stress-activation of positive hole charge carrier in rocks. Phys Chem Earth 2006;31:305–12. [10]Moore JR, Glaser SD. Self-potential observations during hydraulic fracturing. J Geophys Res 2007;112:B02204. [11]Crespy A ,Revil A, Linde N, Byrdina S, Jardani A, Boleve A, et al. Detection and localization of hydromechanical disturbances in a sand box using the self potential method. J Geophys Res2008;113:B01205. [12]Nardi A. Emissioni elettromagnetiche in rocce sottoposte a sollecitazione meccanica. Un possibile precursore sismico?PhD thesis, Univ‘‘LaSapienza’’, Rome,2001. [13]Lichtenberger M. Regional stress field as determined from electromagnetic radiation in a tunnel. J Struct Geol 2005; 27(12):2150–8. [14]Lichtenberger M. Underground measurements of electromagnetic radiation related to stress-induced fractures in the Odenwald Mountains(Germany). Pure Appl Geophys 2006;163:1661–77.en
dc.description.obiettivoSpecifico2.3. TTC - Laboratori di chimica e fisica delle rocceen
dc.description.obiettivoSpecifico2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attiveen
dc.description.journalTypeJCR Journalen
dc.contributor.authorNardi, A.-
dc.contributor.authorCaputo, M.-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia-
dc.contributor.departmentDepartment of Physics, University of Rome ‘‘LaSapienza’’, Rome, Italy-
item.fulltextWith Fulltext- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia- di Fisica, Università La Sapienza, Roma, Italy- Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
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