Accelerometric radiation simulation for the September 26, 1997 Umbria-Marche (Central Italy) main shocks

A. Emolo, A. Zollo


We applied a hybrid stochastic-deterministic method to simulate the strong ground motion characteristics associated with the September 26, 1997 Umbria-Marche main shocks. One hundred different rupture processes on previously inferred fault planes were simulated. The maps of computed PGA (mean values from 100 simulations) show a SE alignment for the 00:33 event and a NW alignment for the 09:40 event, in accordance with the macroseismic data. Moreover, we found a good agreement between the predicted 1ó interval for the PGA values and the data recorded at several accelerometric stations. As a further test, we computed the response spectra at the station Cerreto di Spoleto and found a satisfactory agreement with the synthetic results.


kinematic source model;strong motion simulation;Umbria-Marche main shocks

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X