Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1023
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dc.contributor.authorallBarba, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallBasili, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.date.accessioned2006-02-27T15:33:25Zen
dc.date.available2006-02-27T15:33:25Zen
dc.date.issued2000en
dc.identifier.urihttp://hdl.handle.net/2122/1023en
dc.description.abstractTo contribute to the understanding of the relationships between moderate earthquakes and the faults that are recognizable in the geological record, we analysed seismological and geological data related to the 1997–1998 Umbria-Marche (Central Italy) earthquake swarm. The seismological recordings, collected by local networks, allowed accurate location of about 1000 events, whereas the geological field observations provided a picture of the structural features and the ground-surface deformations. We also re-examined and used some published data and results, mostly about the fault plane solutions and the geology. On the basis of earthquake locations, fault plane solutions, and geological mapping we explored the possible correlation between the earthquake causative fault planes and the normal faults exposed in the area. Our results show that the two main shocks that occurred on 1997 September 26 (MW=5.7 and MW=6.0) originated on the same structure, reactivating at depth the Colfiorito normal faults. Neither rupture propagated up to the ground surface, but both triggered gravitational sliding that occurred along pre-existing fault scarps. The earthquake that occurred on 1997 October 14 (MW=5.6) originated on another fault branch at a much shallower depth. In spite of its lower magnitude, this earthquake produced tectonic ruptures where the fault plane projects to the surface in an area where no faults were previously mapped. By comparing the palaeostress reconstruction, based on slickenside lineation analysis, and the focal mechanism solutions, we suggest a possible correlation between the longterm (Early Middle Pleistocene) cumulative effects of the Colfiorito Fault System and the short-term behaviour of the fault planes observed during this earthquake swarm, favouring the idea of a seismogenic source producing clustered moderate-size earthquakes rather than large events scattered in time.en
dc.description.sponsorshipING, SSN, IRTR-CNRen
dc.format.extent1006904 bytesen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.publisher.nameBlackwellen
dc.relation.ispartofGeophysical Journal Internationalen
dc.relation.ispartofseries141, (2000)en
dc.subjectearthquakeen
dc.subjectnormal faultingen
dc.subjectseismotectonicsen
dc.titleAnalysis of seismological and geological observations for moderate-size earthquakes: the Colfiorito Fault System (Central Apennines, Italy)en
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber214-252en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneousen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneousen
dc.subject.INGV05. General::05.02. Data dissemination::05.02.02. Seismological dataen
dc.description.fulltextpartially_openen
dc.contributor.authorBarba, S.en
dc.contributor.authorBasili, R.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
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 Roma1, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.orcid0000-0001-7965-6667-
crisitem.author.orcid0000-0002-1213-0828-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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