Validated Estimation of Response Spectra for the 1980 Irpinia Earthquake in the Eastern Area of Naples

Nunziata, C.; Costa, Giovanni; Marrara, F.; Panza, G. F.

doi:10.1193/1.1586132

Cited by 24 publications

(21 citation statements)

References 10 publications

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“…The computations were performed separately for the SH and P-SV waves. This hybrid procedure was already successfully proved for several major cities: Mexico [Fah et al, 1994b], Rome and Naples, Italy [Fah et al, 1994a;Vaccari et al, 1995], Bucharest [Panza et al, 20021, Thessaloniki [Triantafyllidis et al, 1998], Beijing [Sun et al, 1998], Naples [Nunziata et al, 2000], Zagreb [Lokmer et al, 2001].…”

Section: Introductionmentioning

confidence: 99%

Deterministic Earthquake Scenarios for the City of Sofia

Slavov

Paskaleva

Kouteva

et al. 2004

Pure and Applied Geophysics

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The city of Sofia is exposed to a high seismidc risk. Macroseismic intensities in the range of VIII -X (MSK) can be expected in the city. The earthquakes, that can influence the hazard at Sofia, originate either beneath the city or are caused by seisnmic sources located within a radius of 40km. The city of Sofia is also prone to the remote Vrancea seismic zone in Romania, and particularly vulnerable are the long -period elements of the built environment. The high seism-ic risk and the lack of instrumental recordings of the regional seismicity makes the use of appropriate credible earthquake scenarios and ground motion modelling approaches for defining the seismic input for the city of Sofia necessary. Complete synthetic seismic signals, due to several earthquake scenarios, were computed along chosen geological profiles crossing the city, applying a hybrid technique, based on the modal summation technique and finite differences.The modelling takes into account simultaneously the geotechnical properties of the site, the position and geometry of the seismic source and the mechanical properties of the propagation medium. Acceleration, velocity and displacement time histories and related quantities of earthquake engineering interest (e.g. response spectra, ground motion amplification along the profiles) have been supplied. The approach applied in this study allows us to obtain the definition of the seismic input at low cost exploiting large quantities of existing data (e.g. geotechnical, geological, seismological). It may be efficiently used to estimate the ground motion for the purposes of microzonation, urban planning, retrofitting or insurance of the built environment, etc.

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Section: Introductionmentioning

confidence: 99%

Deterministic Earthquake Scenarios for the City of Sofia

Slavov

Paskaleva

Kouteva

et al. 2004

Pure and Applied Geophysics

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“…Nunziata Pure appl. geophys., fitted by synthetic seismograms (NUNZIATA et al, 2000) computed with the mode summation technique (PANZA, 1985;FLORSCH et al, 1991) (Fig. 3).…”

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confidence: 99%

“…This validation and the availability of detailed geotechnical information pertaining to the local soil conditions allowed us to compute quite realistic ground motion at two areas of Napoli ( Fig. 1): S. Lorenzo quarter, representative of the historical center (NUNZIATA et al, 2002) and Centro Direzionale, within the quarter of Poggioreale, a newly developed area with skyscrapers of important social use (NUNZIATA et al, 2000). Synthetic seismograms were computed by using the hybrid approach developed by FA¨H (1992) which is based on the mode summation and the finite difference methods.…”

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confidence: 99%

Seismic Ground Motion in Napoli for the 1980 Irpinia Earthquake

Nunziata

2004

Pure and Applied Geophysics

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Abstract-The seismic ground motion in the urban area of Napoli has been computed for the 1980 earthquake (M, = 6.9) with a hybrid technique based on the mode summation and the finite difference methods. The detailed geological setting of each quarter has been reconstructed from several stratigraphies and six geological zones have been recognized. Shear-wave velocity profiles have been assigned, based on hole tests and inversion of Rayleigh group velocities artificially generated.Realistic SH and P-SV wave seismograms have been computed along the representative cross sections of each zone, by assuming selected velocity profiles. Spectral amplifications of 2-4 have been computed at frequencies roughly corresponding to the eigenfrequencies of the most damaged buildings. Moreover, following the intensity-PGA correlations found for the Italian territory, the predicted peak ground accelerations, 0.04-0.10 g correspond to the intensity range VII-VIII on the MCS scale, in agreement with the observed data.

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“…The 1980 earthquake (M S = 6.9, M L = 6.5) is the only strong event recorded close to Napoli (about 12 km away), at the Torre del Greco seismic station. The recorded seismograms at Torre del Greco have been used to validate the numerical simulations of ground motion at Napoli, and they have been modeled by NUNZIATA et al (2000) using the mode summation technique (PANZA, 1985;FLORSCH et al, 1991). Reasonable agreement between synthetic and observed response spectra has been obtained for source-receiver back azimuth of 50°and source depth of 7 km.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Ground Motion at Napoli for the 1688 Scenario Earthquake

Nunziata

Sacco

Panza

2010

Pure Appl. Geophys.

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The Sannio seismogenic area turns out to be responsible for the highest peak ground accelerations (PGA) and seismic response spectra (SRS) at Napoli. The 1688 earthquake is considered representative of the area, and realistic synthetic seis- mograms have been computed for this scenario earthquake at the historical center and the eastern sector of Napoli. The use of a hybrid technique based on mode summation and finite-difference methods is fully justified by the available detailed knowledge about the geological and geophysical properties of the Neapolitan subsoil. This modeling makes it possible to recognize that amplifications of *2 for PGA and [3 for SRS are to be expected because of the pyroclastic soil cover. Based on the information contained in the available catalogs, different magnitudes have been considered. Taking into account the correlation, valid for the Italian territory, between synthetic PGA and observed intensities, it turns out that the most probable magnitude (M) of the 1688 earthquake is 6.7, while M = 7.3 should be assigned to a conservative scenario earthquake. Comparison of the computed response spectra for the 1688 scenario earthquake with the Italian seismic building code shows that the code is adequate with respect to the expected effects at the historical center of Napoli, but that it underestimates the possible ground motion at the eastern sector, in particular at the newly developed area built after the 1980 earthquake

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Validated Estimation of Response Spectra for the 1980 Irpinia Earthquake in the Eastern Area of Naples

Cited by 24 publications

References 10 publications

Deterministic Earthquake Scenarios for the City of Sofia

Deterministic Earthquake Scenarios for the City of Sofia

Seismic Ground Motion in Napoli for the 1980 Irpinia Earthquake

Modeling of Ground Motion at Napoli for the 1688 Scenario Earthquake

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