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Simulation of the Fourier Phase Spectrum for the Generation of Synthetic Accelerograms

Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano, Via Bassini 15-20133, Milano, Italy

The John A. Blume Earthquake Engineering Center, Department of Civil and Environmental Engineering, Stanford University, Stanford, 94034 CA, USA

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H. Thráinsson

The John A. Blume Earthquake Engineering Center, Department of Civil and Environmental Engineering, Stanford University, Stanford, 94034 CA, USA

American Re, 555 College Road East, Princeton, NJ 08543, USA.

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, and

G. Zonno

Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Milano, Via Bassini 15-20133, Milano, Italy

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Abstract

This study presents the application of a new method for generating synthetic accelerograms based on statistical distributions for Fourier phase differences and Fourier amplitudes as functions of earthquake magnitude, hypocentral distance and site geology. Two important characteristics of the methodology are that it requires a small number of input parameters and that ground motion time histories can be simulated without any specific modulation function. Two areas with different tectonic patterns (North-Eastern and Central Italy) were selected for the application. The results of our analysis are reliable in the case of Central Italy because the data set is large and quite uniformly distributed, while for North-Eastern Italy our results should not be used for distances greater than 30 km.

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