GNGTS 2015 - Atti del 34° Convegno Nazionale

Site characterization in ITACA database L. Luzi 1 , C. Felicetta 2 , R. Puglia 1 , E. Russo 3 , F. Pacor 1 , M. D’Amico 1 , G. Lanzano 1 and Working Group 2014 4 INGV-DPC Project S2-Task2 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano. 2 Istituto di Geologia Ambientale e Geoingegneria, Area della Ricerca di Roma 1, Montelibretti (RM). 3 Centro NazionaleTerremoti, Roma. 4 Working Group 2014 INGV-DPC Project S2-Task2: Research Unit 1: Barnaba C., Laurenzano G., Priolo E., Moratto L., Bertoni M., Tamaro A. (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste), Gallipoli M.R. (Consiglio Nazionale delle Ricerche - Istituto di Metodologie per l’Analisi Ambientale, Tito Scalo - PZ), Lizza C., Vignola L.. (Mallet s.r.l.). Research Unit 2: Lovati S., Massa M. (INGV, Milano), Ladina C. (INGV-CNT-Roma). Research Unit 4: Barani S., De Ferrari R., Ferretti G., Scafidi D., Spallarossa D. (Università degli Studi di Genova). Research Unit 5: Albarello D., Francescone M., Lunedei E., Paolucci E., Papasidero M. P.,Peruzzi G., PierucciniP. (Università degli Studi di Siena). Research Unit 8: Castellaro S., Panzeri R., Borgia U., Perricone L. (Università di Bologna). External to the project: Moscatelli M. (CNR-IGAG). Introduction. Ground motion characteristics are strongly influenced by local geologic, geomorphological and geotechnical conditions as well as by seismic source and propagation path. The local site conditions can modify the ground motion in terms of amplitude, frequency and duration of the seismic shaking (Rathje et al. , 2010). Theoretical studies and empirical observations have allowed to discriminate three main types of site effects caused by: • �������� �� ��������� ������ ��������� presence of sediments buried geometry; • ���������� ����������� ��������� particular topographic settings; • ������� ��������������� ���� ��� ��������� �� ������ �� �������� lateral heterogeneities that can determine 2D and/or 3D effects. Available information at seismic stations are frequently inadequate for a proper characterization and can have a significant impact on the definition of seismic hazard both at large and local scale. ITACA station database. The database ITACA (ITalian ACcelerometric Archive http:// itaca.mi.ingv.it , Luzi et al. , 2008; Pacor et al. , 2011) is not only a waveform repository, but also a tool to archive the results of site characterization. The database contains data that were mainly acquired by: the Italian Civil Protection Department (DPC) through the Italian Strong- motion Network (RAN) and the national seismic network operated by Istituto Nazionale di Geofisica e Vulcanologia (INGV). The results of site characterization were obtained from different sources such as: DPC-INGV seismological projects (2006 S6-Project; 2007-2009 S4-Project and 2014 S2-Project)and a joint project (GeoRAN 2014-2015) between CNR- IGAG and DPC. ITACA (itaca.mi.ingv.it ) can host stations metadata such as location, housing, geological and geomorphological details, shear-wave velocity profiles (V S ) or resonance frequency obtained by analysis of ambient noise. In general the station information is available at different levels of details depending on extent of researches performed on the site. Fig. 1 shows the web page for the RAN station AQV (L’Aquila – V. Aterno – Centro valle). This page contains details related to the station and they are grouped into four main categories: 1) descriptive metadata of recording site such as station code and localization in terms of geographic coordinates, address and housing of the recording instrument; 2) information regarding soil category, value of V S,30 , type and quality of measurement to estimate the shear- wave velocity; 3) morphologic and topographic description; 4) quantitative information for seismic site characterization such as Standard Penetration Test (SPT) logs, V S and/or V P profiles, and stratigraphic logs. Station information and other details are included in the station monography that can be downloaded from the web page. The monograph collects extended information, when available, such as photo, geological maps at different scales, geophysical and geotechnical surveys, position of logs, stratigraphic profile, plot of V S and/or V P profiles, report of microtremor H/V spectral ratio and a frame with a synthesis of information. At the end of the page links to other documents relating to the stations are present. 122 GNGTS 2015 S essione 2.2