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Authors: Convertito, V.* 
Herrero, A.* 
Title: Influence of focal mechanism in probabilistic seismic hazard analysis
Journal: Bulletin of the Seismological Society of America 
Series/Report no.: 6/96 (2004) Seismological Society of America
Issue Date: Dec-2004
DOI: 10.1785/0120040036
Keywords: Seismic hazard; Focal mechanism; Ground motion predictive equations
Subject Classification04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk 
Abstract: An extension of probabilistic seismic hazard analysis is proposed to introduce a priori information about seismic source parameters. In particular, faulting style is taken into account with a theoretical corrective coefficient applied to the attenuation law. The validity of this correction is assessed through a comparison with observed data, attenuation law predictions corrected and not corrected, and the results of attenuation laws containing faulting style parameters. The probabilistic nature of the analysis is maintained, introducing into the classical hazard formulation a 2D probability density function describing the most probable focal mechanisms associated with each seismic source zone. This new expression may also be used in the framework of deaggregation analysis. Thus, the design earthquake resulting from the deaggregation is characterized by a focal mechanism. An application to a site located in the Southern Apennines, Italy, is shown. The result of the analysis emphasizes the importance of strike-slip events in the seismic hazard context, compared with normal faulting seismic activity in this region.
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