Nepal Hazard Risk Assessment - Asia-Pacific Gateway for Disaster ...

Nepal Hazard Risk Assessment
Average value of each PGA (different return period base on PSHA analysis) is calculated. This will
resulted in several value decrements as seen in Table 2.1. This decrement value is applied to the baseline
PGA from NGI (Figure 2.2). The results of peak ground acceleration for lower return periods are given
in Figure 2.10, Figure 2.11, Figure 2.12. Values of PGA in lower return periods have maximum value of
±150 gals that quite low for usual structural building standard.
Table 2.1. average value decrements of PGA
PGA 050
year
PGA 100
year
PGA 250
year
PGA 500
year
average PGA 0.13 0.19 0.30 0.39
ratio 0.34 0.49 0.75 1.00
Figure 2.8. Flowchart in creating PGA value for lower return period
Figure 2.10. Peak Ground Acceleration in Nepal, 250 year return period.
Figure 2.9. PGA of 475 year return period based on analysis.
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