Table 4
| Subsidence * Event Designation | Estimated Age ave. err. +-100 yr | Subsidence Amount (m) | Beach Retreat** Event Designation | Estimated Age Thousand years BP | Size | |
| Y | 1,700 AD | ~1 | A | 0.3 ka | Large | |
| W | 1,100 RCYBP | ? | B | 1.1 ka | Small | |
| U | 1,300 RCYBP | <0.5 | C | 1.3 ka | Very-small | |
| S | 1,700 RCYBP | ~1 | D | 1.7 ka | Large | |
| N | 2,500 RCYBP | <0.5 | E | 2.5 ka | Small | |
| L | 2,800 RCYBP | ~1 | F | 2.8 ka | Large | |
| J | 3,200 RCYBP | ~1 | G | 3.2 ka | Small | |
| H | ~4.0 ka | |||||
| I | ~4.2 ka | |||||
| J | <5.0 ka | |||||
| * Subsidence event designation, approximate dates, and estimated amount of coseismic subsidence are from Atwater's compilation (2000). | ||||||
| Age for event Y is known to the year (Satake, 1996). Event's W and U are known to nearest century due to tight C14 calibration curves. | ||||||
| The older events S, N, L and J are less well constrained, but are estimated to the nearest 100 year interval for this report. | ||||||
| Subsidence estimates are based on paleotidal-level indicators from adjacent estuarine wetlands (Shennan et al., 1996; Peterson et al., 2000) | ||||||
| ** Beach retreat event designations and relative size of scarp features in GPR profiles are from Table 3 in this Report. | ||||||
| Ages of retreat events A-G are from correlation with reported subsidence events Y-J in this Report Table 4. | ||||||
| Estimated ages of beach retreat events H and I are from correlation with dated beach ridge (Meyers et al., 1996; Table 2 of this Report). | ||||||
| Limiting age estimate of event I is from basal shoreface deposit ages in nearby drill sites (Herb, 2000; Table 2 of this Report). | ||||||