Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2525
AuthorsStrasser, F. O.* 
Montaldo, V.* 
Douglas, J.* 
Bommer, J. J.* 
TitleComment on "Influence of fochal mechanism in probabilistic seismic hazard analysis" by Vincenzo Convertito and Andre' Herrero
Issue Date2006
Series/Report no.2 / 96 (2006)
DOI10.1785/0120050101
URIhttp://hdl.handle.net/2122/2525
Keywordsstrong ground-motions
Subject Classification04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk 
AbstractThe influence of style-of-faulting on strong groundmotions has been the subject of debate for some time. Although some controversy persists, the general consensus is that ground motions produced by reverse faults are higher than those produced by normal faults, whereas motions from strike-slip faults are somewhere in between. In a recent article, Convertito and Herrero (2004) derived a correction factor for focal mechanism to be applied to predictive equations. This issue was previously addressed by Bommer et al. (2003). Although this article is cited by Convertito and Herrero, it seems that its aims and scope were not well understood, and we would therefore like to clarify what the method presented therein entails, especially because we feel that Convertito and Herrero’s approach of characterizing focal mechanisms based solely on the radiation pattern is difficult to justify. After presenting their correction scheme, Convertito and Herrero go on to present an implementation of probabilistic seismic hazard analysis (PSHA) explicitly accounting for focal mechanism. This represents a real innovation in terms of methodology because it allows propagation of the improvements in ground-motion prediction gained through the focal-mechanism adjustments to hazard estimation. Characterizing the dominant scenario in terms of focal mechanism furthermore has the advantage of providing constraints for numerical simulations that are derived directly from the hazard computation, rather than from arbitrary assumptions. However, in our opinion, the methodology presented by Convertito and Herrero has some serious shortcomings which would need to be addressed before it can lead to improvements of the PSHA methodology. Our discussion includes a comparison with the new Italian seismic hazard map, which was derived using the Bommer et al. (2003) adjustment methodology.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
731.pdf66.38 kBAdobe PDFView/Open
Show full item record

Page view(s)

98
Last Week
0
Last month
checked on Jun 25, 2017

Download(s)

24
checked on Jun 25, 2017

Google ScholarTM

Check

Altmetric