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The Umbria–Marche case: some suggestions for the Italian seismic zonation |
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| Authors: | L Peruzza A Rebez D Slejko and P L Bragato |
| Institution: | a ING Gruppo Nazionale per la Difesa dai Terremoti at OGS, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy b OGS Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Dipartimento di Oceanografia, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy c OGS Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Centro di Ricerche Sismologiche, Via Treviso 55, 33100 Udine, Italy |
| Abstract: | Probabilistic seismic hazard maps, in terms of spectral acceleration and uniform hazard response spectra at given sites, considering local soil conditions, represent a much more complete estimate of the seismic hazard than the traditional maps in terms of peak ground acceleration or macroseismic intensity. This is particularly true when the requests of urban planners and engineers have to be met. The present analysis shows how some hazard parameters, such as the effective peak acceleration and the spectrum intensity, can well synthesise the overall information available from traditional probabilistic studies, but also suggests that soil condition is a first-order ingredient for effective seismic hazard mapping at national level. Three Italian towns, damaged by the 1997 Umbria–Marche earthquake sequence, are considered as example to demonstrate that: (1) soil condition dependent uniform hazard spectra well approximate actual spectra recorded during some events of the seismic sequence; (2) for these localities, the design spectrum of the present Italian seismic code does not seem adequate. These considerations have induced the Italian scientific community to propose an updating of the national seismic zonation on the basis of several hazard parameters, that are described in this paper. |
| Keywords: | PSHA Housner spectrum intensity Italian seismic zonation Italian seismic code Gubbio Cascia Colfiorito Central Italy |
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