Seaside, Oregon, Tsunami Pilot Study—Modernization of FEMA Flood Hazard Maps: GIS Data

data layer: probzones

Map of 100- and 500-year flood zones based on probabilistic tsunami hazard analysis (PTHA) overlaid on Federal Emergency Management Administration (FEMA) Flood Insurance Rate Maps for Seaside-Gearhart area (Tsunami Pilot Study Working Group, 2006). Seaward limit is mean lower low water (NAVD88, Venturato, 2005). Landward boundary of 500-year flood zone may extend eastward because maximum wave height is 2.5 m at eastern edge. Line showing extent of deposits from tsunami generated by 1700 Cascadia earthquake (Priest and others, 1997) is included for comparison.

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