Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3375
DC FieldValueLanguage
dc.contributor.authorallChiaraluce, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italiaen
dc.contributor.authorallChiarabba, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italiaen
dc.contributor.authorallCocco, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallCollettini, C.; Univ. di Perugiaen
dc.contributor.authorallPiccinini, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.date.accessioned2007-12-14T15:42:58Zen
dc.date.available2007-12-14T15:42:58Zen
dc.date.issued2007-10-25en
dc.identifier.urihttp://hdl.handle.net/2122/3375en
dc.description.abstractWe present seismological evidence for the existence of an actively slipping low angle normal fault (15¡ã dip) located in the Northern Apennines of Italy. During a temporary seismic experiment, we recorded ~2000 earthquakes with ML ¡Ý 3.1. The micro-seismicity defines a 500 to 1000 m thick fault zone that cross-cuts the upper crust from 4 km down to 16 km depth. The fault coincides with the geometry and location of the Alto Tiberina Fault (ATF) as derived from geological observations and interpretation of depth-converted seismic reflection profiles. In the ATF hangingwall the seismicity distributions highlight minor synthetic and antithetic normal faults (4-5 km long) that sole into the detachment. The ATF related seismicity shows a nearly constant rate of earthquake production, ~ 3 events per day (ML ¡Ü 2.3), and a higher b-value (1.06) with respect to the fault hanging-wall (0.85) which is characterized by a higher rate of seismicity. In the ATF-zone we also observe the presence of clusters of earthquakes occurring with relatively short time delays and rupturing the same fault patch. To explain movements on the ATF, oriented at high angles (~75¡ã) to the maximum vertical principal stress, we suggest an interpretative model in which crustal extension along the fault is mostly accommodated by aseismic slip in velocity strengthening areas whilst micro-earthquakes occur in velocity weakening patches. We propose that these short-lived frictional instabilities are triggered by fluid overpressures related to the build-up of CO2¨Crich fluids as documented by boreholes in the footwall of the ATF.en
dc.language.isoEnglishen
dc.publisher.nameAGUen
dc.relation.ispartofJournal of Geophysical Researchen
dc.relation.ispartofseries/112 (2007)en
dc.subjectLow angle normal faultsen
dc.titleArchitecture and mechanics of an active low-angle normal fault: Alto Tiberina Fault, northern Apennines, Italyen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumberB10310en
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamicsen
dc.identifier.doi10.1029/2007JB005015, 2007en
dc.description.obiettivoSpecifico3.1. Fisica dei terremotien
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorChiaraluce, L.en
dc.contributor.authorChiarabba, C.en
dc.contributor.authorCocco, M.en
dc.contributor.authorCollettini, C.en
dc.contributor.authorPiccinini, D.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.departmentUniv. di Perugiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.deptUniversità La Sapienza-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia-
crisitem.author.orcid0000-0002-9697-6504-
crisitem.author.orcid0000-0002-8111-3466-
crisitem.author.orcid0000-0001-6798-4225-
crisitem.author.orcid0000-0002-1826-646X-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
Appears in Collections:Article published / in press
Files in This Item:
File Description SizeFormat Existing users please Login
Chiaraluce_Etal_JGR_071.1 MBAdobe PDF
Show simple item record

Page view(s) 50

199
checked on Mar 27, 2024

Download(s)

46
checked on Mar 27, 2024

Google ScholarTM

Check

Altmetric