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

Figure 16

Seawardmost beach ridge topography in the south Seaside beach plain. Cobble ridge elevations are in meters NAVD88. The seawardmost beach ridge elevation at the Cove is 7.1 m, corresponding to the 20 ft NAVD29 contour. The seawardmost beach ridge elevation at Avenue N (6 m elevation) falls to the Necanicum channel (1 m elevation) in the Avenue N entrenchment feature, over a distance of 300 m.