Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4505
AuthorsMeletti, C.* 
Galadini, F.* 
Valensise, G.* 
Stucchi, M.* 
Basili, R.* 
Barba, S.* 
Vannucci, G.* 
Boschi, E.* 
TitleA seismic source zone model for the seismic hazard assessment of the Italian territory
Issue Date26-Jan-2008
Series/Report no./450 (2008)
DOI10.1016/j.tecto.2008.01.003
URIhttp://hdl.handle.net/2122/4505
KeywordsSeismotectonics
Seismic source zone model
Seismic hazard
Italy
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk 
04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics 
AbstractWe designed a new seismic source model for Italy to be used as an input for country-wide probabilistic seismic hazard assessment (PSHA) in the frame of the compilation of a new national reference map. We started off by reviewing existing models available for Italy and for other European countries, then discussed the main open issues in the current practice of seismogenic zoning. The new model, termed ZS9, is largely based on data collected in the past 10 years, including historical earthquakes and instrumental seismicity, active faults and their seismogenic potential, and seismotectonic evidence from recent earthquakes. This information allowed us to propose new interpretations for poorly understood areas where the new data are in conflict with assumptions made in designing the previous and widely used model ZS4. ZS9 is made out of 36 zones where earthquakes with Mw >= 5 are expected. It also assumes that earthquakes with Mw up to 5 may occur anywhere outside the seismogenic zones, although the associated probability is rather low. Special care was taken to ensure that each zone sampled a large enough number of earthquakes so that we could compute reliable earthquake production rates. Although it was drawn following criteria that are standard practice in PSHA, ZS9 is also innovative in that every zone is characterised also by its mean seismogenic depth (the depth of the crustal volume that will presumably release future earthquakes) and predominant focal mechanism (their most likely rupture mechanism). These properties were determined using instrumental data, and only in a limited number of cases we resorted to geologic constraints and expert judgment to cope with lack of data or conflicting indications. These attributes allow ZS9 to be used with more accurate regionalized depth-dependent attenuation relations, and are ultimately expected to increase significantly the reliability of seismic hazard estimates.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
MelettiEtAl_Tectonophysics_ZS9.pdfMain article4.41 MBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

525
checked on Apr 22, 2017

Download(s)

65
checked on Apr 22, 2017

Google ScholarTM

Check

Altmetric