GNGTS 2018 - 37° Convegno Nazionale

390 GNGTS 2018 S essione 2.2 References Charvet I., Ioannou I., Rossetto T., Suppasri A. and Imamura F.; 2010: Empirical fragility assessment of buildings affected by the 2011 Great East Japan tsunami using improved statistical models . Natural Hazards, 73, 951-973. D.M. 03/03/1975, Decreto Ministeriale “Approvazione delle norme tecniche per le costruzioni in zone sismiche” . Gazzetta ufficiale 08/04/1975 n. 93 Del Gaudio C., De Martino G., Di Ludovico M., Manfredi G., Prota A., Ricci P. and Verderame G.M.; 2017: Empirical fragility curves from damage data on RC buildings after the 2009 L’Aquila earthquake . B. Earthq. Eng., 15, 1425-1450. Dolce M., Speranza E., Giordano F., Borzi B., Bocchi F., Conte C., Di Meo A., Faravelli M., and Pascale V.; 2017: Da.D.O. – A web-based tool for analyzing and comparing post-earthquake damage database relevant to national seismic events since 1976 . In: Proceedings of the 17th national conference of seismic engineering in Italy, Pistoia, Italy (in Italian). Grünthal G. (ed.), Musson R.M.W., Schwarz J., and Stucchi M.; 1998: European Macroseismic Scale. Cahiers du Centre Européen de Géodynamique et de Séismologie , Vol. 15 - European Macroseismic Scale 1998. European Center for Geodynamics and Seismology, Luxembourg. Michelini A., Faenza L., Lauciani V., and Malagnini L.; 2008: ShakeMap implementation in Italy . Seismol Research Letters 79, 688-697. R.D.L. 29/04/1915, n. 573 Regio Decreto Legge “Norme tecniche ed igieniche da osservarsi per i lavori edilizi nelle località colpite dal terremoto del 13/01/1915” . Gazzetta ufficiale 11/05/1915 n. 117. Rosti A., Rota M. and Penna A.; 2018: Damage classification and derivation of damage probability matrices from L’Aquila (2009) post-earthquake survey data . B. Earthq. Eng., 16(9), 3687-3720. Rota M., Penna A. and Strobbia C.L.; 2008: Processing Italian damage data to derive typological fragility curves . Soil Dyn. Earthq. Eng., 28, 933-947. ESTIMATION OF NEAR-SURFACE SEISMIC ATTENUATION THROUGH VSP SURVEYING F.S. Desideri, M. Cercato “Sapienza” University of Rome - DICEA, Area Geofisica, Italy Introduction. Seismic attenuation is definited by the loss of elastic energy contained in a seismic wave, while it propagates. We used two well-established methods for ours Q estimates, Spectral Ratio and Rise time. In the Spectral Ratio (SR) method, the determination of attenuation is based on the standard assumption of exponential amplitude decay in the frequency domain. When Q P is considered to be frequency-independent, the inverse problem is generally stable, and it can be linearized and solved for all of these three parameters: (1-1) Where and are the amplitude spctrum of two seismic traces. The left-hand side of the equation is called Reduced Spectral Ratio. The slope term, , is called Differential Attenuation (Teng, 1968). The Rise Time (RT) method is based on the assumption that the pulse rise time increase linearly with the distance of propagation (Gladwin & Stacey, 1974). An attenuative impulse will satisfy the equation: (1-2) where τ is the rise time of the resultant pulse and C is a constant. Acquisition & survey geometry. From 2nd to 8th August 2017, as part of the investigation and study activities related to the level III Seismic Microzonation (MS) of the Municipality of Rieti (RI), in Campomoro (Borgo S. Antonio), a continuous core drilling was carried out, up