Table 1.
VLM rates and 1-sigma uncertainties (Std.) in mm/yr for published values from HM74 vs. present-day as derived from our RNI VLM solution. Differences in the VLM rates are also shown in the last column in mm/yr. Negative values indicate the rate of subsidence has decreased since 1974, and positive values indicate the rate of subsidence has increased since 1974. Velocities at additional notable cities: Virginia Beach, VA (−2.14 ± 1.42 mm/yr), Virginia Beach, VA (−1.41 ± 0.52 mm/yr), ocean City, MD (−2.4 ± 0.5 mm/yr).
| ID# | Location | 1974 VLM (mm/yr) | 1974 Std. Dev. (mm/yr) | 19–23’ VLM | 19–23’ Unc. | Difference (mm/yr) |
|---|---|---|---|---|---|---|
| 1 | Allens Fresh, MD | −1.97 | 0.60 | −1.81 | 1.15 | −0.16 |
| 2 | Annapolis, MD | −2.10 | 0.38 | −1.26 | 1.57 | −0.84 |
| 3 | Baltimore, MD | −1.79 | 0.38 | −0.75 | 1.35 | −1.04 |
| 4 | Bowers, DE | −4.03 | 0.65 | −1.73 | 1.73 | −2.30 |
| 5 | Boykins, VA | −3.16 | 0.91 | −0.81 | 0.62 | −2.35 |
| 6 | Cambridge, MD | −1.93 | 0.65 | −2.31 | 0.81 | +0.38 |
| 7 | Carrsville, VA | −4.79 | 0.76 | −1.59 | 1.44 | −3.20 |
| 8 | Chesapeake City, VA | −2.32 | 0.49 | −2.26 | 0.72 | −0.06 |
| 9 | Chestertown, MD | −3.03 | 0.61 | −0.87 | 1.44 | −2.16 |
| 10 | Clayton, DE | −3.07 | 0.56 | −1.39 | 0.48 | −1.68 |
| 11 | Crisfield, MD | −1.93 | 0.82 | −2.30 | 1.60 | +0.37 |
| 12 | Deep Water Pt., MD | −2.95 | 0.63 | −1.25 | 0.78 | −1.70 |
| 13 | Delaware City, DE | −2.51 | 0.63 | −1.40 | 0.67 | −1.11 |
| 14 | Dover, DE | −3.47 | 0.57 | −1.57 | 1.07 | −1.90 |
| 15 | Easton, MD | −1.88 | 0.64 | −2.26 | 1.20 | +0.38 |
| 16 | Elkridge, MD | −1.10 | 0.38 | −0.69 | 1.15 | −0.41 |
| 17 | Elkton, MD | −2.51 | 0.47 | −1.27 | 1.34 | −1.24 |
| 18 | Ellendale, DE | −3.16 | 0.55 | −2.12 | 1.30 | −1.04 |
| 19 | Fredericksburg, VA | −1.23 | 0.59 | −0.79 | 0.67 | −0.44 |
| 20 | Golden Hill, MD | −1.93 | 0.82 | −2.24 | 1.36 | +0.31 |
| 21 | Hampton Roads, VA | −2.42 | 0.50 | −2.28 | 1.01 | −0.14 |
| 22 | Harrington, DE | −3.07 | 0.54 | −2.12 | 1.30 | −0.95 |
| 23 | Havre DeGrace, MD | −2.51 | 0.47 | −0.88 | 0.15 | −1.63 |
| 24 | Kiptopeke, VA | −1.06 | 0.71 | −2.20 | 1.78 | +1.14 |
| 25 | Lee Hall, VA | −3.05 | 0.81 | −1.37 | 0.24 | −1.68 |
| 26 | Lewes, DE | −2.84 | 0.49 | −2.38 | 2.65 | −0.46 |
| 27 | Marlboro, MD | −1.66 | 0.40 | −1.23 | 0.77 | −0.43 |
| 28 | Milford, DE | −3.11 | 0.55 | −2.12 | 1.30 | −0.99 |
| 29 | Norfolk, VA | −2.77 | 0.52 | −2.05 | 1.48 | −0.72 |
| 30 | Piney Point, MD | −2.00 | 0.58 | −2.32 | 0.31 | +0.32 |
| 31 | Port Royal, VA | −0.92 | 0.84 | −0.84 | 2.21 | −0.08 |
| 32 | Portsmouth, VA | −2.77 | 0.52 | −2.01 | 1.42 | −0.76 |
| 33 | Princess Anne, MD | −2.04 | 0.67 | −2.31 | 1.58 | +0.27 |
| 34 | Providence Forge, VA | −3.63 | 1.26 | −1.16 | 2.04 | −2.47 |
| 35 | Queenstown, MD | −2.75 | 0.58 | −2.02 | 4.41 | −0.73 |
| 36 | Richmond, VA | −1.86 | 1.92 | −0.69 | 0.69 | −1.17 |
| 37 | Salisbury, MD | −2.14 | 0.62 | −2.33 | 0.97 | +0.19 |
| 38 | Saluda, VA | −3.06 | 0.95 | −2.21 | 1.33 | −0.85 |
| 39 | Smithfield, VA | −3.25 | 0.71 | −1.83 | 0.59 | −1.42 |
| 40 | Solomons, MD | −2.45 | 0.48 | −2.11 | 1.36 | −0.34 |
| 41 | Spring Grove, VA | −1.61 | 0.91 | −0.97 | 1.05 | −0.64 |
| 42 | St. George, DE | −2.46 | 0.52 | −1.35 | 0.61 | −1.11 |
| 43 | Tappahannock, VA | −1.94 | 1.02 | −1.93 | 1.64 | −0.01 |
| 44 | Toano, VA | −2.05 | 0.87 | −1.33 | 1.92 | −0.72 |
| 45 | Washington, DC | −1.11 | 0.40 | −1.12 | 1.59 | +0.01 |
| 46 | Weona, MD | −0.64 | 0.91 | −2.31 | 1.40 | +1.67 |
| 47 | West Point, VA | −3.76 | 0.95 | −2.17 | 1.47 | −1.59 |
| 48 | Westland, VA | −1.54 | 1.27 | −2.26 | 0.55 | +0.72 |
| 49 | Whitehaven, MD | −1.32 | 0.76 | −2.33 | 0.87 | +1.01 |
| 50 | Williamsburg, VA | −3.03 | 0.83 | −1.33 | 1.33 | −1.70 |
| 51 | Yorktown, VA | −3.09 | 0.83 | −1.36 | 0.78 | −1.73 |