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

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Nepal Hazard Risk Assessment 2 ANNEXURE 2 EARTHQUAKE HAZARD ASSESSMENT Overall methodology can be seen in Figure 2.1. PGA map is modified from Nepal PGA map that later converted to MMI to create MMI map. Figure 2.2. Peak Ground Acceleration in Nepal (NGI, 2004), modified from map of Department of Mine and Geology of Nepal. 2.1 GROUND MOTION Figure 2.1. Methodology for earthquake hazard assessment. PGA of Nepal is presented in Figure 2.2, modified from map of bedrocks peak ground acceleration from Department mine and Geology of Nepal ((Pandey et al., 2002)) 2.2 CONVERSION OF PGA TO MMI The wide used formulas for conversion of PGA to MMI based on the work of (Trifunac and Brady, 1975) and (Wald et al., 1999), can be seen in equation below: MMI Trifunac 1 log 980 0.014 0.3 MMI Wald 2.20 log 1.00 The result for PGA conversion to MMI and statistic distribution can be seen in Figure 2.3, Figure 2.4, Figure 2.5, and Figure 2.6. The conversion of PGA to MMI usually saturated in MMI value of 8, therefore maximum value of MMI by conversion for dangerous zone will be around value of 8. 100
Nepal Hazard Risk Assessment Figure 2.3. MMI map from PGA conversion (Trifunac). Figure 2.5. MMI map from PGA conversion (Wald). Figure 2.4. Statistics of MMI (Trifunac) Figure 2.6. Statistics of MMI (Wald) 101
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