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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2002
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dc.contributor.authorallCara, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallDi Giulio, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallRovelli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.date.accessioned2007-01-11T09:37:54Zen
dc.date.available2007-01-11T09:37:54Zen
dc.date.issued2003-09-30en
dc.identifier.urihttp://hdl.handle.net/2122/2002en
dc.description.abstractSeismic noise recorded by broad-band stations in the middle of and around the Colfiorito plain is analyzed in the frequency band 0.1 to 10 Hz. Small daily variations in noise amplitude are found, on the order of 2 for f > 1 Hz. In contrast, long-term amplitude variations due to weather conditions are significant throughout the analyzed frequency band; for f < 1 Hz, the amplitude increase can be as large as a factor of 50. In the low-frequency band, horizontal components vary much more than the vertical at both firm and soft sites. However, these noise variations at low frequencies do not contaminate significantly the 0.9-Hz peak of the H/V spectral ratio that fits the fundamental eigenfrequency of the sedimentary fill of the basin, resonating during earthquakes. Correlating the long-term variations of noise with different meteorological parameters, we find that wind speed best matches the low-frequency noise disturbances.en
dc.format.extent1371855 bytesen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.publisher.nameAmerical Geophysical Unionen
dc.relation.ispartofGeophysical Research Lettersen
dc.relation.ispartofseries18/30en
dc.subjectmicrotremorsen
dc.subjectambient noise variationsen
dc.subjectH/V spectral ratiosen
dc.titleA Study on Seismic Noise Variations at Colfiorito, Central Italy: Implications for the Use of H/V Spectral Ratiosen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.identifier.URLhttp://www.agu.org/journals/gl/gl0318/2003GL017807/2003GL017807.pdfen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.04. Ground motionen
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysisen
dc.identifier.doi10.1029/2003GL017807en
dc.relation.referencesAki, K., Space and time spectra of stationary stochastic waves with special reference to microtremors, Bull. Earthq. Res. Inst., 35, 415–456, 1957. Bard, P.-Y., Microtremor measurements: A tool for site effect estimation?, in The Effects of Surface Geology on Seismic Motion, edited by Irikura, Kudo, Okada, and Sasatani, 1251–1279, Balkema, Rotterdam, Netherland, 1999. Di Giulio, G., A. Rovelli, F. Cara, R. Azzara, F. Marra, R. Basili, and A. Caserta, Long-duration, asynchronous ground motions in the Colfiorito plain, central Italy, observed on a 2D dense array, J. Geophys. Res., in press, 2003. Duval, A.-M., Détermination de la réponse d’un site aux séismes à l’aide du bruit de fond: évaluation expérimentale, Thèse de Doctorat, Univ.é Pierre et Marie Curie, Paris (in French), 1994. Faeh, D., F. Kind, and D. Giardini, A theoretical investigation of average H/V ratios, Geophys. J. Int., 145, 535– 549, 2001. Field, E. H., and K. H. Jacob, A comparison and test of various siteresponse estimation techniques, including three that are not reference-site dependent, Bull. Seism. Soc. Am., 85, 1127–1143, 1995. Friedrich, A., F. Krueger, and K. Kingle, Ocean-generated microseismic noise located with the Grafenberg array, J. Seismology, 2, 47– 64, 1998. Hasselmann, K., Statistical analysis of the generation of microseisms, Rev. Geophys., 1, 177–210, 1963. Lachet, C., and P.-Y. Bard, Numerical and theoretical investigations on the possibilities and limitations of Nakamura’s techniques, J. Phys. Earth., 42, 377– 397, 1994. Lermo, J., and F. J. Cha`vez-Garc`a, Site evaluation using spectral ratios with only one station, Bull. Seism. Soc. Am., 83, 1574– 1594, 1993. Longuet-Higgins, M. D., A theory on the origin of microseisms, Philos. Trans. R. Soc. Lond. A., 243, 1– 35, 1950. Nakamura, Y., A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface, QR of R.T.R., 30, 1, February, 1989. Withers, M. M., R. C. Aster, C. J. Young, and E. P. Chael, High frequency analysis of seismic background noise as a function of wind speed and shallow depth, Bull. Seism. Soc. Am., 86, 1507– 1515, 1996.en
dc.description.fulltextreserveden
dc.contributor.authorCara, F.en
dc.contributor.authorDi Giulio, G.en
dc.contributor.authorRovelli, A.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
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.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.orcid0000-0002-1702-563X-
crisitem.author.orcid0000-0002-4097-7102-
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.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-
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