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dc.contributor.authorallRigano, S.; Dipartimento di Scienze Geologiche, Università di Catania, Catania, Italiaen
dc.contributor.authorallCara, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallLombardo, G.; Dipartimento di Scienze Geologiche, Università di Catania, Catania, Italiaen
dc.contributor.authorallRovelli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.description.abstractDuring local and regional earthquakes, an evident amplification of horizontal ground motion is observed at two seismological stations near the Tremestieri fault, on the southeastern flank of Mt. Etna volcano. Rotated-component spectral ratios show a narrow spectral peak around 4-Hz along a N40°E direction. A conventional polarization analysis using the eigenvectors of the covariance matrix confirms the very stable directional effect enhancing the approximately NE-SW elongation of the horizontal ground motion in the fault zone. The effect is evident during the entire seismogram and independent of source backazimuth as well as distance and depth of earthquakes. The same polarization is observed in ambient noise as well. This consistency allowed us to use microtremors for checking ground motion polarization along and across the Tremestieri fault zone with a high spatial resolution. The result is a stable polarization of horizontal motion in the entire area, interesting a broad frequency band. To check whether this ground motion property is recurrent and understand a possible relationship with fault strike, faulting style, or orientation of fractures, ambient noise was recorded on other mapped faults of the Mt. Etna area, the Moscarello, Acicatena and Pernicana faults. The latter, in particular, is characterized by different strike and faulting style. A systematic tendency of ambient noise to be polarized is found in all of the faults. A picture emerges where normal faults of the eastern flank show a E-W to NE-SW polarization that changes on the Pernicana fault, which develops approximately E-W and is characterized by a prevailing NW-SE to NS polarization. Directions of polarization were never parallel to the fault strike. Moreover, polarization persists too far away from the fault trace, excluding an effect limited to a narrow low velocity zone hosted between harder wall rocks. Both these observations rule out an interpretation in terms of fault-trapped waves. The cause of observed polarizations will be the subject of future studies. However, the consistency with recent results of velocity anisotropy in a part of the investigated area suggests a possible role of attenuation anisotropy on horizontal amplitude variations versus azimuth.en
dc.relation.ispartofJournal of Geophysical Researchen
dc.relation.ispartofseries/113 (2008)en
dc.subjectfault zonesen
dc.subjectEtna volcanoen
dc.titleEvidence for ground motion polarization on fault zones of mt. etna volcanoen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.04. Ground motionen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoringen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismologyen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysisen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.11. Seismic risken
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dc.description.obiettivoSpecifico4.1. Metodologie sismologiche per l'ingegneria sismicaen
dc.description.journalTypeJCR Journalen
dc.contributor.authorRigano, S.en
dc.contributor.authorCara, F.en
dc.contributor.authorLombardo, G.en
dc.contributor.authorRovelli, A.en
dc.contributor.departmentDipartimento di Scienze Geologiche, Università di Catania, Catania, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.departmentDipartimento di Scienze Geologiche, Università di Catania, Catania, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
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crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-à di Catania- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia- di Scienze Geologiche, Università di Catania,- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia- Nazionale di Geofisica e Vulcanologia- Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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