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

Figure 17

Topography of the middle beach ridge(s) separating the Necanicum and Neawanna interridge valleys in the Seaside beach plain. Cobble ridge elevations are in meters. The highest beach ridge divide (5 m elevation) falls to the Neawanna channel (1 m elevation) at the 3rd Avenue and K Avenue localities. A very broad ridge (4 m elevation) drops to the supratidal wetlands (3.5 m elevation) in the Palmrose bogs at site 832.