caa a22 4500 467936250 CHVBK 20180406152958.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s11069-006-0001-2 doi (NATIONALLICENCE)springer-10.1007/s11069-006-0001-2 Evidence of Amplification Effects in Fault Zone Related to Rock Mass Jointing [Elektronische Daten] [S. Martino, A. Minutolo, A. Paciello, A. Rovelli, G. Mugnozza, V. Verrubbi] Results of geological, geomechanical and seismometric investigations aiming at the analysis of the seismic response in a carbonate ridge of the Nera River valley (Central Apennines - Italy) are discussed. Geological and geomechanical surveys were aimed at defining the stratigraphic and structural setting of the outcropping formations and the jointing conditions of the rock mass. Velocimetric records of both ambient noise and small-magnitude earthquakes were analysed in order to identify amplification conditions. The analysis was carried out in the time domain, through directional energy evaluation, and in the frequency domain, through H/V spectral ratios and spectral ratios with respect to a reference station. A local amplification factor was estimated from Housner intensity. The study revealed a significant seismic amplification in a fault zone. This effect was observed in intensely jointed and mylonitic rock masses, located inside moderately jointed rock masses, and is the result of specific geometries and significant impedance contrasts. A map of fault zones prone to amplification of ground motion was constructed, taking into account the jointing conditions of the rock masses and the structural setting of the investigated ridge. The study relied on an integrated methodological approach, which combined the available data under union and intersection criteria. Springer, 2006 jointed rock masses nationallicence velocimetric records nationallicence seismic amplification nationallicence trapped waves nationallicence Central Italy nationallicence Martino S. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, P.le A. Moro 5, CAP 00185, Roma, Italy aut Minutolo A. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, P.le A. Moro 5, CAP 00185, Roma, Italy aut Paciello A. ENEA C.R. Casaccia, Via Anguillarese 301, CAP 00060, S. Maria di Galeria, Roma, Italy aut Rovelli A. INGV, Via di Vigna Murata 605, CAP 00143, Roma, Italy aut Mugnozza G. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, P.le A. Moro 5, CAP 00185, Roma, Italy aut Verrubbi V. ENEA C.R. Casaccia, Via Anguillarese 301, CAP 00060, S. Maria di Galeria, Roma, Italy aut Natural Hazards Kluwer Academic Publishers 39/3(2006-12-01), 419-449 0921-030X 39:3<419 2006 39 11069 https://doi.org/10.1007/s11069-006-0001-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11069-006-0001-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Martino S. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, P.le A. Moro 5, CAP 00185, Roma, Italy aut NATIONALLICENCE 700 1- Minutolo A. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, P.le A. Moro 5, CAP 00185, Roma, Italy aut NATIONALLICENCE 700 1- Paciello A. ENEA C.R. Casaccia, Via Anguillarese 301, CAP 00060, S. Maria di Galeria, Roma, Italy aut NATIONALLICENCE 700 1- Rovelli A. INGV, Via di Vigna Murata 605, CAP 00143, Roma, Italy aut NATIONALLICENCE 700 1- Mugnozza G. Dipartimento di Scienze della Terra, Università di Roma "La Sapienza”, P.le A. Moro 5, CAP 00185, Roma, Italy aut NATIONALLICENCE 700 1- Verrubbi V. ENEA C.R. Casaccia, Via Anguillarese 301, CAP 00060, S. Maria di Galeria, Roma, Italy aut NATIONALLICENCE 773 0- Natural Hazards Kluwer Academic Publishers 39/3(2006-12-01), 419-449 0921-030X 39:3<419 2006 39 11069 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer