GNGTS 2015 - Atti del 34° Convegno Nazionale

Riepl J., Bard P.-Y., Hatzfeld D., Papaioannou C., Nechtschein S. (1998). Detailed evaluation of site response estimation methods accros and along the sedimentary valley of Volvi (EUROSEISTEST) . ����� ������ ���� ���� Bull. Seism. Soc. Am., 88(2), 488-502. Rigano R., Cara F., Lombardo G., Rovelli A. (2008). Evidence for ground motion polarization on fault zones of Mount Etna volcano . J. Geophys. Res. 113, B10306, doi: 10.1029/2007JB005574. Rodriguez V. H., Midorikawa S. (2002). Applicability of the H/V spectral ratio of microtremors in assessing site effects on seismic motion. Earthqu . Eng. Struct. Dyn., 31(2), 261–279. Schnabel, P. B., Lysmer, J. and Seed, H. B. (1972). Shake a computer program for earthquake response analysis of horizontally layered sites. Report No. EERC 72 - 12, Earthquake Engineering Research Center, University of California, Berkeley, California. Seekins L.C., Wennerberg L., Marghereti L., Liu H.-P. (1996). Site amplification at five locations in San Fransico, California: a comparison of S waves, codas, and microtremors . Bull. Seism. Soc. Am., 86(3), 627–635. SESAME (2004) - Guidelines for the implementation of the H/V spectral ratio technique on ambient vibrations: Measurements, processing and interpretation . SESAME European Research Project WP12, deliverable D23.12, at http://sesame-fp5.obs.ujfgrenoble . fr/Deliverables, 2004. Zhao J.X., Irikura K., Zhang J., Fukushima Y., Somerville P.G., AsanoA., Ohno Y., Oouchi T., Takahashi T., Ogawa H. (2006). An empirical site-classification method for strong-motion stations in Japan using H/V response spectral ratio . Bull. Seismol. Soc. Am., 96, 914–925. Dynamic characterization and deconvolution analysis fOR some SITES OF THE NATIONAL ACCELEROMETRIC Network (RAN) E. Paolucci, D. Albarello, E. Lunedei, G. Peruzzi, M. P. Papasidero, M. Francescone, P. Pieruccini Dipartimento di Scienze Fisiche, della Terra e dell’Ambiente dell’Università degli Studî, Siena, Italy Introduction. This work is part of the DPC-INGV-S2 research project devoted to improving mid-long term seismic hazard assessment in Italy (https://sites.google.com/site/ ingvdpc2012progettos2/home). One of its main aims is the empirical testing of seismic hazard estimates proposed so far for the Italian area (Albarello et al. , 2015). To this purpose, several sites belonging to the Italian accelerometric network (RAN) active for a long time (at least 25 years) are considered and the probabilistic “forecasts” provided by each hazard estimate for that sites is compared with observations (for a general discussion of the testing methodology see Albarello and D’Amico, 2015). Since hazard estimates are generally provided for reference soil conditions, sites of type A (by following NTC, 2008) only, which represent a subset of the considered sites. Furthermore, site soil classification for the most part of these stations was provided on the basis of large-scale (1:100,000) geological maps only, and this inaccurate soil classification may bias results of testing. To face this problem, the first phase of the work has been devoted to estimate the S- wave velocity ( V S ) profile at all the sites and to provide a site characterization in terms of V S,30 . Thus, to exploit as much as possible available information, observations at non-reference sites were deconvolved ( e.g. , Kramer, 1996) for the local seismic response to obtain accelerometric records “equivalent” to those relative to reference site conditions. Results relative to nine accelerometric sites are presented here: eight of them are located in Central Italy (Cagli, Cascia, Castel Viscardo, Matelica, Peglio, Rincine, Senigallia, Sirolo) and one in southern Italy (Gildone). By following the procedure described in Pileggi et al. (2011), the V S profile at these locations has been estimated by performing ambient vibration measurements both in single-station and multiple-station configuration. For each non-reference site, the free computer program STRATA (https://nees.org/resources/strata ) has been used to 148 GNGTS 2015 S essione 2.2