Abstract
During the L’Aquila seismic sequence (Italy, 2009) we had the opportunity to install temporary accelerometric stations to study the role of seismic site amplification in damage enhancement. Two of the monitored sites, Castelnuovo and Navelli were also a good test for the recently introduced Italian seismic code (NTC08 2008) that prescribes an aggravation factor for slopes and ridges. Castelnuovo was an ideal situation to check the rule proposed for the distribution of amplification as a function of the position along a slope, while Navelli provided the possibility to test the almost equivalent factors that NTC08 sets for stratigraphic and topographic amplification (respectively up to 40 and 60 %). In neither case the observation matches code provisions. For Castelnuovo, there is a frequency dependence that shows as the code is over-conservative for short periods but fails to predict amplification in the intermediate range. For Navelli, the code provision is verified for long periods, but in the range around the site resonance frequency the stratigraphic amplification proves to be three times more important than the topographic one.
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References
Ameri G, Oth A, Pilz M, Bindi D, Parolai S, Luzi L, Mucciarelli M, Cultrera G (2011) Separation of source and site effects by generalized inversion technique using the aftershock recordings of the 2009 L’Aquila earthquake. Bull Earthq Eng 9:717–739. ISSN: 1570–761X. doi:10.1007/s10518-011-9248-4
Bergamaschi F, Cultrera G, Luzi L, Azzara R, Ameri G, Augliera P, Bordoni P, Cara F, Cogliano R, Dalema E, Di Giacomo D, Di Giulio G, Fodarella A, Franceschina G, Galadini F, Gallipoli MR, Gori S, Harabaglia P, Ladina C, Lovati S, Marzorati S, Massa M, Milana G, Mucciarelli M, Pacor F, Parolai S, Picozzi M, Pilz M, Pucillo S, Puglia R, Riccio G, Sobiesiak M (2011) Evaluation of site effects in the Aterno river valley (Central Italy) from aftershocks of the 2009 L’Aquila earthquake. Bull Earthq Eng 9:697–715. ISSN: 1570–761X, doi:10.1007/s10518-011-9245-7
Bonamassa O, Vidale JE (1991) Directional site resonances observed from aftershocks of the 18th October 1989 Loma Prieta earthquake. Bull Seism Soc Am 81:1945–1957
Costanzo A, D’Onofrio A, Silvestri F, Martelli L, Gallipoli MR, Piscitelli S, Mucciarelli M (2010) The seismic response of the Castelnuovo hill (Central Italy) after the 2009 Abruzzo earthquake. In: Proceedings of the 5ICEGE (international conference on earthquake geotechnical engineering) (in press)
Gallipoli MR, Mucciarelli M (2009) Comparison of site classification from VS30, VS10, and HVSR in Italy. Bull Seismol Soc Am 99:340–351
Gallipoli MR, Albarello D, Mucciarelli M, Bianca M (2011) Ambient noise measurements to support emergency seismic microzonation: the Abruzzo 2009 earthquake experience. Bollettino di Geofisica Teorica e Applicata 53:539–559. ISSN: 0006–6729. doi:10.4430/bgta0031
Lanzo G, Silvestri F, Costanzo A, d’Onofrio A, Martelli L, Pagliaroli A, Sica S, Simonelli A (2011) Site response studies and seismic microzoning in the Middle Aterno valley (L’aquila, Central Italy). Bull Earthq Eng 9(5):1417–1442
Martino S, Minutolo A, Paciello A, Rovelli A, Verrubbi V (2006) Evidence of amplification effects in fault zone related to rock mass jointing. Nat Hazards 39:419–449
Massa M, Lovati S, D’Alema E, Ferretti G, Bakavoli M (2010) An experimental approach for estimating seismic amplification effects at the top of a Ridge, and the implication for ground-motion predictions: the case of Narni, Central Italy. Bull Seism Soc Am 100:3020–3034. doi:10.1785/0120090382
Mucciarelli M, Bianca M, Ditommaso R, Gallipoli MR, Masi A, Milkereit C, Parolai S, Picozzi M, Vona M (2011a) Far field damage on RC buildings: the case study of Navelli during the L’Aquila (Italy) seismic sequence, 2009. Bull Earthq Eng 9:263–283. ISSN: 1570–761X. doi:10.1007/s10518-010-9201-y
Mucciarelli M, Bianca M, Ditommaso R, Vona M, Gallipoli MR, Piscitelli S, Rizzo E, Picozzi M (2011b) Peculiar earthquake damage on a reinforced concrete building in San Gregorio (L’Aquila, Italy): site effects or building defects? Bull Earthq Eng 9(3):825–840. ISSN: 1570–761X. doi:10.1007/s10518-011-9257-3
NTC08 (2008) Nuove Norme Tecniche per le Costruzioni, Gazzetta Ufficiale n. 29, Suppl. n. 30
Puglia R, Ditommaso R, Pacor F, Mucciarelli M, Luzi L, Bianca M (2011) Frequency variation in site response as observed from strong motion data of the L’Aquila (2009) seismic sequence. Bull Earthq Eng 9:869–892
Rai A, Rodriguez Marek M, Yong A (2012) Topographic effects in strong ground motion. In: Proocedings 12 world conference on earthquake engineering, Lisbon 2012, electronic edition
Spudich P, Hellweg M, Lee WHK (1996) Directional topographic site response at Tarzana observed in aftershocks of the 1994 Northridge, California, earthquake: implications for mainshock motions. Bull Seism Soc Am 86(1B):S193–S208
Vidale JE, Bonamassa O, Houston H (1991) Directional site resonances observed from the 1 October 1987 Whittier Narrows, California, earthquake and the 4 October aftershock. Earthq Spectra 7:107–125
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Gallipoli, M.R., Bianca, M., Mucciarelli, M. et al. Topographic versus stratigraphic amplification: mismatch between code provisions and observations during the L’Aquila (Italy, 2009) sequence. Bull Earthquake Eng 11, 1325–1336 (2013). https://doi.org/10.1007/s10518-013-9446-3
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DOI: https://doi.org/10.1007/s10518-013-9446-3