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Fig. 18.11. Observed average failures per district of potable water system in Duzce
following theKocaeli-Duzce earthquake sequence: August-November 1999
bedrockisfoundatabout120-150mdepth.Figures18.13and18.14presenttheavailable
geotechnicalandgeophysicalsurveysandtwotypicalcross-sectionsofthecity.(Pitilakis
et al., 2006, Final report MERP project). The evaluation of the hazard maps of ground
motion is carried out using a 1D equivalent linear approach. As input motion at the seis-
mic bedrock, we used the deconvolution of the recorded motion at the Meteorological
Station located inthetown center.
The computed PGV values in Duzce (background in Figure 18.15) are varying from 0.6
to0.85m/sdependingonlocalsoilconditions.Thecomputedshearstrains( PGSs )at2m
depthrangefrom7
10 5 to2
10 4 ,whilethepeakvalueswithinthetop15mfrom
.
·
.
·
0
3
10 4 to 2
10 3 (Figure 18.16). Accepting an average ratio PGSs
5
75,
based on the results of Figure 18.10, and considering an average PGSs (shear strains) in
·
.
3
·
/
PGSa
1
.
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