Paleotsunami Inundation of a Beach Ridge Plain: Cobble Ridge Overtopping and Interridge Valley Flooding in Seaside, Oregon, USA

Figure 5

Map of 1964 maximum highwater line and tsunami sand layer (TSL) deposits in the Seaside beach ridge plain. Inundation was limited to the Necanicum Bay, and the Necanicum and Neawanna interridge valleys [5, 6]. Preserved sand layers from the 1964 event do not reach the full extent of the mapped tsunami flooding in either the Necanicum or Neawanna interridge valleys.