Modeling of Ground Motion at Napoli for the 1688 Scenario Earthquake

Abstract

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

The key role of hazard indices and hotspot in disaster risk management: the case study of Napoli and Pozzuoli municipalities (Southern Italy)

“…The municipalities of Napoli and Pozzuoli (hereafter, PNMs) were chosen as the test area to validate the proposed methodology. It hosts about 3.183.465 people (ISTAT, 2017) and is exposed to volcanic (Lirer, Petrosino, Alberico, & Postiglione, 2001;Orsi, De Vita, & Di Vito, 1996), seismic (Esposito, Porfido, Luongo, & Petrazzuoli, 1992;Nunziata, 2004;Nunziata, Sacco, & Panza, 2011), flood (Esposito, Matano, & Scepi, 2018;Vennari, Parise, Santangelo, & Santo, 2016) (Figure 1). The deposits outcropping in the area were mainly emplaced by post-CI Campi Flegrei volcanic activity, and are made up of loose to lithified (tuffs) pyroclastic products and minor lava flows.…”

Control spectra for Quito

“…Comparisons between control spectra or specific response spectra obtained with empirical GMPEs (ground motion prediction equations) and a seismic code spectrum have been made in other cities or seismic zones as mentioned in GasparEscribano et al (2008), Hao and Gaull (2009) and Nunziata et al (2011), inter alia. Control spectra or specific response spectra are also used to estimate the seismic hazard and risk in cities or specific sites (Rivas-Medina et al, 2011, 2014a.…”

“…Control spectra or specific response spectra are also used to estimate the seismic hazard and risk in cities or specific sites (Rivas-Medina et al, 2011, 2014a.…”

Control Spectra for Quito

“…Comparisons between control spectra or specific response spectra obtained with empirical GMPEs (ground motion prediction equations) and a seismic code spectrum have been made in other cities or seismic zones as mentioned in Gaspar-Escribano et al (2008), Hao and Gaull (2009) and Nunziata et al (2011), inter alia. Control spectra or specific response spectra are also used to estimate the seismic hazard and risk in cities or specific sites (Rivas-Medina et al, 2011, 2014a.…”