Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4372
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dc.contributor.authorallHeap, M.; UCL, UKen
dc.contributor.authorallVinciguerra, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallMeredith, P. G.; UCL, UKen
dc.date.accessioned2008-11-28T13:27:34Zen
dc.date.available2008-11-28T13:27:34Zen
dc.date.issued2009-
dc.identifier.urihttp://hdl.handle.net/2122/4372en
dc.description.abstractVolcanic edifices, such as Mt. Etna (Italy), are commonly subject to repeated cycles of stress over time due to the combination of magma emplacement from deep reservoirs to shallow depths and superimposed tectonic stresses. Such repeated stress cycles lead to anisotropic deformation and an increase in the level of crack damage within the rocks of the edifice and hence changes to their elastic moduli, which are a key parameter for reliable modelling of deformation sources. We therefore report results of changes in elastic moduli measured during increasing amplitude cyclic stressing experiments on dry and water-saturated samples of Etna basalt. In all experiments, the Young’s modulus decreased by approximately 30% over the total sequence of loading cycles, and the Poisson’s ratio increased by a factor of approximately 3 ± 0.5. Microseismicity, in terms of acoustic emission (AE) output, was also recorded throughout each experiment. Our results demonstrate that AE output only re-commences during any loading cycle when the level of stress where AE ceased during the unloading portion of the previous cycle is exceeded; a manifestation of the Kaiser stress-memory effect. In cycles where no AE output is generated, we also observe no change in elastic moduli. This result is observed for both mechanical and thermal stressing. Our results are interpreted in relation to measurements of volcano-tectonic seismicity and deformation at Mt. Etna volcano.en
dc.language.isoEnglishen_US
dc.publisher.nameElsevieren_US
dc.relation.ispartofTectonophysicsen_US
dc.relation.ispartofseries1-2/471 (2009)en_US
dc.subjectrock mechanics, elastic moduli, Etna basalten
dc.titleThe evolution of elastic moduli with increasing crack damage during cyclic stressing of a basalt from Mt. Etna volcanoen_US
dc.typearticleen
dc.description.statusPublisheden_US
dc.description.pagenumber153-160en_US
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocksen
dc.identifier.doi10.1016/j.tecto.2008.10.004en_US
dc.description.obiettivoSpecifico3V. Proprietà chimico-fisiche dei magmi e dei prodotti vulcanicien_US
dc.description.journalTypeJCR Journalen_US
dc.description.fulltextreserveden
dc.contributor.authorHeap, M.-
dc.contributor.authorVinciguerra, S.-
dc.contributor.authorMeredith, P. G.-
dc.contributor.departmentUCL, UKen_US
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen_US
dc.contributor.departmentUCL, UKen_US
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptUCL,UK-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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