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Title: Broadband NDSHA computations and earthquake ground motion observations for the Italian territory

Authors: Andrea Magrin; Alexander A. Gusev; Fabio Romanelli; Franco Vaccari; Giuliano F. Panza

Addresses: Department of Mathematics and Geosciences, University of Trieste, Via E. Weiss, 4 Pal. P, Trieste I-34127, Italy ' Institute of Seismology and Volcanology, Far East Division, Russian Ac. Sci., Piip Blvd. 9, Petropavlovsk-Kamchatsky 683006, Russia; Kamchatka Branch, Geophysical Survey, Russian Ac. Sci., Piip Blvd. 9, Petropavlovsk-Kamchatsky 683006, Russia ' Department of Mathematics and Geosciences, University of Trieste, Via E. Weiss, 4 Pal. P, Trieste I-34127, Italy ' Department of Mathematics and Geosciences, University of Trieste, Via E. Weiss, 4 Pal. P, Trieste I-34127, Italy ' Department of Mathematics and Geosciences, University of Trieste, Via E. Weiss, 4 Pal. P, Trieste I-34127, Italy; China Earthquake Administration, Institute of Geophysics, Beijing, China; International Seismic Safety Organization (ISSO), Viale San Francesco, 12, I-64031 Arsita (TE), Italy; Accademia Nazionale dei Lincei, Palazzo Corsini – Via della Lungara, 10 – 00165, Rome, Italy

Abstract: The aim of this work is two-fold: 1) to compare the results of national scale NDSHA modelling for the Italian region at 10 Hz cut-off, based on the relevant available knowledge, with observations (e.g., peak ground motion values) and existing empirical attenuation relations; 2) to update the scaling law for source spectra (SLSS) to be used for the selected area. The new set of source spectra, defined along the lines suggested by the comparison with empirical attenuation relations, produces acceptable results in terms of PGV and spectral acceleration at long periods. Synthetic PGA and SA at short periods show a faster attenuation with respect to the observed ones and, therefore, the effect of complex attenuation factors should be explored in future ad hoc studies.

Keywords: synthetic seismograms; scaling law for source spectra; SLSS; modal summation; strong motion estimation; ground motion prediction; NDSHA modelling; earthquake scenarios; seismic hazards; ground motion observations; Italy; earthquakes.

DOI: 10.1504/IJEIE.2016.080038

International Journal of Earthquake and Impact Engineering, 2016 Vol.1 No.1/2, pp.131 - 158

Available online: 26 Oct 2016 *

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