Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9638
AuthorsMarzocchi, W.* 
Taroni, M.* 
TitleSome Thoughts on Declustering in Probabilistic Seismic-Hazard Analysis
Issue Date2014
Series/Report no./104 (2014)
DOI10.1785/0120130300
URIhttp://hdl.handle.net/2122/9638
Keywordsseismic hazard
declustering
Subject Classification04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk 
AbstractIn this paper, we discuss in depth, one of the basic procedures that stands behind probabilistic seismic-hazard analysis (PSHA), that is, the declustering of the seismicity rates. First, we explore the technical, scientific, and practical motivations that led to introducing the declustering of seismicity rates. Then, we show that for PSHA, declustering is essential only to minimize a spatial distortion of the earthquake occurrence process, but, conversely, it may lead to significant underestimation of the true seismic hazard. This underestimation precludes the possibility to test meaning- fully PSHA against real observations, and it may lead to underestimate the seismic risk, whenever seismic-hazard maps are used for risk assessment. Finally, we propose a methodology that can be used in PSHA to avoid this potential bias.
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