Treatment of ground-motion predictive relationships for the reference seismic hazard map of Italy |
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| Authors: | Email author" target="_blank">Valentina?MontaldoEmail author Ezio?Faccioli Gaetano?Zonno Aybige?Akinci Luca?Malagnini |
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| Institution: | (1) Istituto Nazionale di Geofisica e Vulcanologia, Sezione “Sismologia Applicata”, via Bassini 15, 20133 Milano, Italy;(2) Department of Structural Engineering, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy;(3) Istituto Nazionale di Geofisica e Vulcanologia, Sezione “Sismologia e Tettonofisica”, via di Vigna Murata 605, 00143, Roma, Italy |
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| Abstract: | In the framework of the 2004 reference seismic hazard map of Italy the amplitude of the strong-motion (expressed in terms
of Peak Horizontal Acceleration with 10% probability of non-exceedence in 50 years, referred to average hard ground conditions)
was computed using different predictive relationships. Equations derived in Italy and in Europe from strong-motion data, as
well as a set of weak and strong-motion based empirical predictive relationships were employed in a logic tree procedure,
in order to capture the epistemic uncertainty affecting ground-motion attenuation. This article describes the adjustments
and conversions required to eliminate the incompatibilities amongst the relations. Particularly significant are distance conversions
and style-of-faulting adjustments, as well as the problems related to the use of regional relations, such as the selection
of a reference depth, the quantification of random variability and the strong-motion prediction. Moreover, a regional attenuation
relationship specific for volcanic areas was also employed, allowing a more realistic evaluation of seismic hazard, as confirmed
by the attenuation of macroseismic intensities. |
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| Keywords: | epicentral and Joyner-Boore distance epistemic uncertainty predictive relationships seismic hazard mapping scaling laws volcanic regions |
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