USGS, NOAA, FEMA

U.S. Geological Survey
Data Series 236
Version 1.0

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

Historic Tsunami Events and FEMA Flood Insurance Rate Maps

Deposits from several historic tsunamis in the Seaside area have been identified and mapped (Fiedorowicz, 1997; Jaffe and others, 2004). The locations of samples from the deposits (dot symbols) are compared in this figure with inundation limits for (1) “casc1700ln”, a worst case scenario of a Cascadia subduction zone (CSZ) earthquake (Priest and others, 1997); (2) “ak64ln”, the 1964 Alaskan earthquake tsunami (Horning, Apx. C, Tsunami Pilot Study Working Group, 2006); and (3) “DOGAMI 95”, a limit based on one-dimensional modeling of the CSZ in response to 1995 Oregon Senate Bill 379 (Priest, 1995). The background map is the Flood Insurance Rate Map (FIRM) for Seaside, Oregon (FEMA, 1981).

historic tsunami events and FEMA flood maps

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