Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6643
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dc.contributor.authorallTrippetta, F.; Univ. di Perugia, Italyen
dc.contributor.authorallCollettini, C.; Univ. di Perugia, Italyen
dc.contributor.authorallVinciguerra, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallMeredith, P. G.; UCL, UKen
dc.date.accessioned2011-01-14T07:58:42Zen
dc.date.available2011-01-14T07:58:42Zen
dc.date.issued2010-06en
dc.identifier.urihttp://hdl.handle.net/2122/6643en
dc.description.abstractThe Triassic Evaporites (TE) of the Umbria–Marche Apennines, a sedimentary succession made up of a sequence of alternating sulphates (anhydrites and gypsum) and dolostones, represent a key lithology in terms of sealing properties and earthquake triggering. Here we: (1) report laboratory measurements of density, porosity, Vp, Vs, seismic anisotropy and permeability at effective confining pressures from 0 to 100 MPa, conducted on samples of TE collected from both outcrops and boreholes; and (2) attempt to upscale the laboratory results to larger scale geophysical investigation, such as Vp sonic logs, seismic tomography and in situ measurements of pore-fluid pressure. The average laboratory P-wave velocity is 6.0 km/s for dolostones, 4.6 km/s for gypsum–dolostones and 5.8 km/s for anhydrites, at ambient pressure. As effective confining pressure is increased up to 100 MPa, the average P-wave velocity increases to 7.0 km/s for dolostones, 5.3 km/s for gypsum and 6.4 km/s for anhydrites. Vp/Vs ratios appear to be independent of confining pressure, with average values of ∼1.8 to ∼2.2 for sulphates and ∼1.9 to ∼2.2 for dolostones, respectively, for dry and saturated conditions. All samples are characterized by very lowpermeability (10−18m2 to 10−21m2), with the higher values for gypsum–dolostones and fractured dolostones samples. The Vp profiles obtained fromultrasonic laboratory measurementsmatch well the in situ Vp profilesmeasured using sonic logs. In the laboratory, the Vp/Vs ratio increases when pressurized pore fluids are present, in agreement with 4D seismic tomography that relates the increase in Vp/Vs ratio to the migration of fluids during the 1997 Umbria–Marche seismic sequence (Mmax∼6.0) that nucleates within the TE. Our low-permeability values are consistent with deep borehole measurements of high pore-fluid pressure trapped within the Triassic Evaporites.en
dc.language.isoEnglishen
dc.publisher.nameElsevieren
dc.relation.ispartofTectonophysicsen
dc.relation.ispartofseries/492(2010)en
dc.subjectPhysical Properties, Laboratory measurements, Triassic Evaporites, Geophysical dataen
dc.titleLaboratory measurements of the physical properties of Triassic Evaporites from Central Italy and correlation with geophysical dataen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber121-132en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zonesen
dc.subject.INGV04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonicsen
dc.subject.INGV05. General::05.02. Data dissemination::05.02.02. Seismological dataen
dc.identifier.doi10.1016/j.tecto.2010.06.001en
dc.description.obiettivoSpecifico2.3. TTC - Laboratori di chimica e fisica delle rocceen
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorTrippetta, F.en
dc.contributor.authorCollettini, C.en
dc.contributor.authorVinciguerra, S.en
dc.contributor.authorMeredith, P. G.en
dc.contributor.departmentUniv. di Perugia, Italyen
dc.contributor.departmentUniv. di Perugia, Italyen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.departmentUCL, UKen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptUniversità La Sapienza-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.orcid0000-0001-8336-2194-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent05. General-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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