A recently proposed renewal hybrid method has been applied for the evaluation of the seismic hazard of the City of Catania (East Sicily). Since the site seismicity appears to be dominated by the Malta Escarpment, an offshore fault developing for over 200 km, the traditional Poissonian model has been used only for the representation of low magnitude background occurrences. The characteristic earthquakes generated by the fault have been described through a renewal process assuming that the event occurrence probability is also function of the time elapsed from the previous characteristic event. In order to have a better representation of the local seismicity a reshaping of the traditional seismic zonation proposed by the Italian Group for the Defence against Earthquakes (GNDT) and a reconsideration of associated seismic events have been required. The results, mainly in terms of uniform hazard seismic spectra, have been represented also in de-aggregated format in order to define the probabilistic scenario earthquake.
The Application of a Hybrid Recurrence Model to the Probabilistic Seismic Hazard Analysis for the city of Catania
RASULO, Alessandro
2001
Abstract
A recently proposed renewal hybrid method has been applied for the evaluation of the seismic hazard of the City of Catania (East Sicily). Since the site seismicity appears to be dominated by the Malta Escarpment, an offshore fault developing for over 200 km, the traditional Poissonian model has been used only for the representation of low magnitude background occurrences. The characteristic earthquakes generated by the fault have been described through a renewal process assuming that the event occurrence probability is also function of the time elapsed from the previous characteristic event. In order to have a better representation of the local seismicity a reshaping of the traditional seismic zonation proposed by the Italian Group for the Defence against Earthquakes (GNDT) and a reconsideration of associated seismic events have been required. The results, mainly in terms of uniform hazard seismic spectra, have been represented also in de-aggregated format in order to define the probabilistic scenario earthquake.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
