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|Authors: ||Strasser, F. O.*|
Bommer, J. J.*
|Title: ||Comment on "Influence of fochal mechanism in probabilistic seismic hazard analysis" by Vincenzo Convertito and Andre' Herrero|
|Title of journal: ||Bull. Seismol. Soc. Amer.|
|Series/Report no.: ||2 / 96 (2006)|
|Publisher: ||Seismological Society of America|
|Issue Date: ||2006|
|Keywords: ||strong ground-motions|
|Abstract: ||The 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
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:||04.06.11. Seismic risk|
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