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

Figure 3

Core logs including dated paleosubsidence and paleotsunami sand layers in reported core sections from representative sites in the Seaside beach plain. Four of the five tsunami sand layers (TSL) are associated with regionally correlated coseismic subsidence horizons dated from ~0.3 to 2 ka. One weakly developed paleotsunami sand layer (TSL2a) is not associated with a paleosubsidence horizon [7, 8]. See Figure 2 for core site locations and see Table 1 for radiocarbon data. Core logs, radiocarbon dates, and paleotsunami sand source mineralogy data are from sites NW2, NW7, 832, 879 [2, 3, 9], sites 832, 716, and 879 [4], and from sites j40b and j22 [6]. All additional figures use the same core log citations: NWx for [2, 3] xxx for [4] jxx for [6].