Tables--because of their small font size the numbers identifying the sites referred to in the tables are not distinguishable on the web image versions of Plate 1. Please refer to the paper print of Plate 1 (included with the report) or download a high resolution version of Plate 1 (available in postscript and Arc/Info formats) from this site at "https://pubs.usgs.gov/of/1997/438/plate1.html".
Table 1A-Measurements from debris-flow source areas in Madison County, VA. Sample locations (ID) are shown on Plate 1.
Thickness (THICK ), width, and length refer to measurements of initial landslide made at debris-flow source area. MATERIAL refers
to type of geologic material involved in initial sliding which mobilized into debris flow: C-colluvium, S-saprolite, R-bedrock, D-debris,
or combination of the above. ROCK? (Y/N) refers as to whether bedrock served either as the surface of sliding or a permeability
barrier. HOLLOW? (Y/N) indicates whether the source area was located in a noticeable topographic depression. SHAPE denotes
whether the failure surface of the initial landslide was planar (P) or rotational (R). MULTIPLE (Y/N) indicates whether multiple
landslides initiated in close proximity. Measurements identified (ID) by initial and number (e.g. W-1a) recorded by Gerald Wieczorek
(W), Randy Orndorff (O), Bill Burton (B), Benjamin Morgan (M), and Giuseppe Mandrone (G).
ID ELEV SLOPE THICK WIDTH LENGTH MATERIAL ROCK? HOLLOW? SHAPE MULTIPLE?
(FT) (?) (FT) (FT) (FT)
W-1a 1160 29 3.28 21.00 36.09 C Y Y P Y
W-1b 1120 25 20.01 125.01 164.05 C Y Y P Y
W-1c 1080 17 14.76 29.86 49.87 S N Y P Y
W-12-z 2080 6.89 47.90 35.11 C N Y P N
W-13-z 1400 34 4.00 20.01 30.02 C Y Y P Y
W-14-z 1360 2.53 30.02 C P N
W-15-z 1120 2.00 40.03 100.07 C N N P N
W-17 1550 26 6.56 40.03 53.15 C Y N P N
W-17-z 1910 41 4.92 37.08 41.01 C Y P N
W-18 1800 32 18.05 45.93 44.95 C Y N R N
W-18-z 1740 30 3.28 39.04 27.89 C N P N
W-19-z 1660 22 5.74 28.87 28.87 C/S N P N
W-20 1930 34 6.56 38.06 60.04 C N N R Y
W-20-z 1620 17.55 160.11 75.13 R Y Y R Y
W-21 1950 32 3.28 40.03 60.04 C Y N P Y
W-22a 1950 30 0.98 17.06 29.86 C Y N P Y
W-22b 1960 28 9.02 9.84 15.09 C Y
W-23 1760 30 6.56 37.08 40.03 C N N P N
W-24 1650 32 4.92 44.95 29.86 C N N P N
W-25 1600 34 1.15 60.04 40.03 C N N P N
W-34a 2000 20 3.28 30.02 27.00 C N N P Y
W-34b 2080 25 9.84 65.62 65.62 C Y Y P Y
W-34c 2110 28 6.56 82.03 114.84 C/S Y N P Y
W-36a 2230 24 1.64 32.81 32.81 C N N P Y
W-36b 2250 24 6.56 16.41 26.25 C N N P Y
W-38a 2920 24 6.56 82.03 32.81 C Y N P Y
W-38b 2960 23 4.92 29.00 35.11 C N N P Y
W-39 1840 31 3.28 32.81 42.98 C Y N P N
W-40 2200 30 3.28 35.11 87.93 C Y R N
W-41 1760 23 11.48 125.01 140.10 C N R Y
W-43b 1070 26 6.56 49.87 64.96 C N Y P N
W-51a 1260 32 1.64 49.87 49.87 C Y P N
W-52 1450 30 9.84 29.86 40.03 C/R Y P N
W-53a 1680 32 1.64 25.92 29.86 R Y P Y
W-53b 1680 31 0.98 14.11 29.86 C N P Y
W-53c 1680 29 0.82 23.95 23.95 C N P Y
W-53d 1680 32 1.64 9.84 29.86 C N P Y
W-54 1790 30 0.82 25.92 27.89 C N Y P N
W-56 1790 33 2.46 36.09 24.94 C/R Y P Y
W-57 1790 35 0.98 49.87 44.95 C Y P N
W-58 1790 34 4.92 47.90 80.06 S N R N
W-59 1790 34 0.82 42.00 49.87 S N P Y
W-60 1790 34 0.98 55.12 44.95 C Y N P N
W-74 1290 30 15.09 200.14 75.13 C/R Y R Y
W-76a 860 35 5.91 40.03 29.86 S N N P Y
W-76b 860 35 S N N P Y
W-83a 1200 32 1.51 47.90 77.10 C Y N P Y
W-83b 1200 31 2.00 21.98 46.92 C/R Y N P Y
W-84 1320 34 9.84 49.87 62.67 R Y P N
W-85 1360 30 1.74 22.97 35.11 C N N P N
W-86 1360 28 6.56 50.86 47.90 C Y N P N
W-87a 1720 26 15.09 44.95 120.08 C/S Y P Y
W-87b 1715 25 10.01 20.01 20.01 S N N R Y
W-88 1800 28 17.55 98.43 120.08 S N N
W-89 1780 28 12.47 49.87 120.08 R Y P N
W-90 1720 27 12.47 29.86 40.03 S R N
W-94a 1480 0.98 29.86 29.86 C N P N
W-97 1400 15.09 27.56 35.11 C N P N
W-101 1440 30 7.87 40.03 80.06 R Y P N
W-103 1640 28 12.47 120.08 140.10 C/S N N P Y
W-104 1700 38 2.95 24.94 60.04 C Y Y P N
O-1 1610 31 6.56 32.81 82.03 C N Y R Y
O-2 1500 32 3.28 39.37 49.22 C Y N P Y
O-3 1630 30 4.92 C N Y P Y
O-4 1360 28 6.56 6.56 6.56 C N N N
O-5 1260 28 6.56 6.56 6.56 C N N N
O-17 1910 20 3.28 180.46 196.86 R N N R N
O-23 2630 31 4.92 18.05 42.98 C N Y P N
O-26 2970 28 6.56 42.65 72.18 C Y Y P N
O-43 1610 28 3.28 19.69 19.69 C Y Y P N
O-44 1580 27 19.69 147.65 121.40 C/R/S Y N R N
O-45 1550 27 3.28 39.37 52.50 C N Y P N
O-55 1230 30 3.28 42.65 36.09 C Y Y P N
O-57 1500 27 4.92 32.81 65.62 C N Y P N
O-58a 1450 33 1.97 31.17 82.03 C N Y P N
O-58b 1420 31 1.97 14.76 39.37 C N Y P N
O-68 2440 35 3.28 19.03 42.00 C Y Y P N
O-69 2570 36 3.28 24.94 36.09 C N Y P N
O-70 2050 30 1.64 18.05 24.61 C N Y P N
O-74 1680 24 3.28 16.41 29.53 C N Y P N
B-75 1200 32 1.64 32.81 43.97 C N N P Y
B-78 1500 34 9.84 18.05 39.37 C N N P Y
B-79 1540 28 1.64 36.09 64.96 C N Y P N
B-80 1700 30 1.64 68.90 92.85 C Y Y P Y
B-81 1620 32 1.64 24.94 80.06 C Y Y P N
B-82 1620 30 0.82 25.92 25.92 C Y N P N
B-83 1710 31 0.66 94.82 161.75 C Y Y P Y
B-85a 1310 30 1.08 15.09 24.94 D N Y P Y
B-85b 1310 32 1.64 37.08 46.92 D N Y P Y
B-59 2700 28 3.28 13.12 49.22 C N Y P N
B-108 1550 35 1.64 28.87 60.04 C Y N P N
B-123 2040 31 0.98 28.87 58.07
B-129 1440 25 13.12 60.04 40.03 C Y Y P N
B-132a 1550 32 6.56 50.86 129.93 C N Y P Y
B-132b 1550 34 4.92 30.84 94.82 C N Y P Y
M-3 1010 25 3.28 98.43 65.62 D/R Y Y R N
M-6 1350 30 9.84 39.37 82.03 C N Y P Y
M-7 1750 25 C N N R Y
M-8 1480 30 19.69 104.99 492.15 C N Y P Y
M-9 1360 30 C N Y P Y
M-11 1310 32.81 164.05 328.10 D/R Y Y N
M-19 1750 30 6.56 59.06 79.73 D/R Y Y P Y
M-19b 1800 31 1.97 37.08 44.95 C Y N P Y
M-20 1720 30 6.56 98.43 131.24 C N P Y
M-21 1960 28 49.22 114.84 49.22 C/S N Y R N
M-22 2100 30 3.28 19.69 26.25 C N N P N
M-23 2140 37 3.28 26.25 26.25 C N Y P N
M-24 2080 30 1.64 22.97 45.93 C Y Y P N
M-25 2120 30 3.28 26.25 49.22 C Y Y P N
M-26 2120 32 3.28 32.81 45.93 R Y Y P N
M-27 2200 23 4.92 19.69 32.81 C/R Y Y P N
M-28 2200 34 4.92 19.69 19.69 R Y Y P N
M-29 2270 28 6.56 72.18 124.68 C N Y P N
M-30 2330 32 3.28 52.50 C Y Y P N
M-31 2330 28 3.28 19.69 29.53 C Y Y P N
M-32 2520 30 32.81 49.22 65.62 C N Y P N
M-42 1520 31 3.28 36.09 52.50 C Y Y P N
M-55 1860 32 4.92 29.53 72.18 C N N R N
M-56 1860 30 6.56 42.65 85.31 C Y Y P N
M-57 2000 31 3.28 26.25 32.81 C N Y P Y
M-58 1880 30 6.56 82.03 229.67 C Y N R Y
M-59 1880 30 3.28 19.69 39.37 C N N P Y
M-60 1860 9.84 9.84 C N N R Y
M-61 1580 20 6.56 26.25 19.69 C N N R N
M-62 1500 26 3.28 19.69 52.50 C N Y P N
M-68 1220 31 3.28 55.78 52.50 C Y Y P Y
M-72 1550 31 3.28 42.65 124.68 C Y Y P Y
M-73 1250 31 6.56 85.31 124.68 C Y Y P N
M-74 1180 28 1.64 C N N P Y
M-75 1220 30 1.64 22.97 19.69 C N N P N
M-87 1390 22 13.12 52.50 29.53 C N N P N
M-89 1580 30 6.56 C N N P N
M-90 1480 31 3.28 22.97 29.53 C N N P N
M-91 1360 29 3.28 36.09 55.78 C N Y P N
M-92 1280 25 13.12 42.65 55.78 C N Y P N
M-103 1480 7.38 164.05 C N Y P Y
M-104 1600 27 3.28 52.50 32.81 C N Y P N
M-105 1740 31 3.28 D/R Y Y P N
M-106 1840 29 3.28 16.41 36.09 D/R Y Y P Y
M-107 1920 27 3.28 36.09 26.25 C N N R N
M-108 1860 30 6.56 52.50 65.62 C N N R N
M-109 1550 31 6.56 45.93 59.06 D/R Y Y P N
M-110 1300 32 3.28 32.81 49.22 D Y Y P N
M-111 1230 29 3.28 65.62 108.27 C N Y P N
M-117 1300 32 9.84 16.41 49.22 D N Y P N
M-118 1300 28 3.28 19.69 39.37 D N Y P N
M-119 1360 35 3.28 68.90 52.50 C N Y P N
M-120a 1380 32 6.56 22.97 65.62 C N Y P Y
M-120b 1380 31 3.28 42.65 62.34 R Y Y P Y
M-121 1380 30 3.28 13.12 55.78 C N Y P Y
M-122 1320 34 3.28 13.12 29.53 C/R Y Y P Y
M-124 860
M-125 1100 21 3.28 26.25 29.53 C N Y P Y
M-126a 1200 30 3.28 55.78 98.43 R Y Y P Y
M-126b 1260 31 6.56 42.65 32.81 C N Y P Y
M-126c 1260 30 6.56 32.81 22.97 C N Y P Y
M-127 1260 30 3.28 13.12 26.25 C N Y P N
M-132 1560 32 6.56 13.12 36.09 C Y Y P N
M-136 1740 25 1.08 52.50 78.74 C N Y P Y
M-137 1750 26 0.33 36.09 36.09 C N Y P N
M-138 1830 35 19.69 19.69 39.37 R Y Y R N
M-139 1440 31 6.56 39.37 36.09 R Y Y P N
M-140 1420 30 6.56 36.09 42.65 R Y Y P N
M-141 1320 31 6.56 59.06 118.12 R Y N P N
M-142 1380 32 6.56 32.81 104.99 C/R Y Y P Y
M-143 1400 30 6.56 62.34 52.50 R Y Y P N
M-144 1420 28 3.28 32.81 45.93 C N N R N
M-150 2230 29 6.56 42.65 98.43 R Y Y P Y
M-151 2040 30 3.28 22.97 49.22 C/R N Y P N
M-152 2000 31 3.28 42.65 36.09 D/R N Y P N
M-157 2440 36 4.92 39.37 88.59 R Y Y P N
M-158 1730 30 3.28 22.97 42.65 R Y Y P N
M-159 1640 20 9.84 22.97 59.06 R Y Y P N
M-160 1810 28 3.28 26.25 39.37 R Y Y P Y
M-161 1750 27 Y
M-162 1220 32 3.28 19.69 65.62 C N N P N
M-163 1250 25 12.47 300.21 125.01 C Y P N
M-165 1030 1.48 17.55 10.01 S N P Y
M-166 1060 24 14.76 109.91 109.91 C N N R N
M-169 1800 30 1.97 63.98 75.13 C Y N P N
M-170 2050 33 1.97 24.94 20.01 C N P Y
M-171 2140 40 2.95 20.01 29.86 C Y Y P N
G-1 1000 28 6.56 32.02 36.03 C N N P N
G-2 1200 33 2.00 27.00 28.02 S N N P Y
G-3 1440 33 6.56 36.75 54.01 C/R Y N P Y
G-4 1370 34 6.56 16.01 16.01 C N Y R Y
G-5 960 35 1.64 18.01 22.02 C N Y P Y
G-6 960 34 3.28 20.01 21.00 R Y Y P N
G-7 1020 28 3.28 37.73 45.93 C/R Y N P Y
G-8 1760 28 11.48 27.00 51.02 C N N P N
G-9 1860 30 8.20 20.01 25.00 R Y P N
G-10 1940 33 4.92 30.02 37.76 C/S/R Y Y P Y
G-11 1920 35 1.64 23.00 47.02 C Y Y P Y
G-12 1600 35 3.28 32.02 45.02 C Y N P Y
G-13 1780 28 3.28 24.02 20.01 C Y Y P Y
G-14 1640 35 3.28 29.00 54.01 S Y Y P N
G-15 1700 35 2.62 17.00 55.02 S Y Y P N
G-16 1310 28 6.56 22.02 32.02 C Y Y P Y
G-17 1160 25 3.28 42.00 60.01 C/S N N P N
G-18 1520 33 6.56 26.02 22.02 C Y Y R N
G-19 1380 30 1.64 38.03 30.02 C N Y P Y
G-20 1350 34 2.30 14.99 30.02 C Y N P Y
G-21 1300 35 1.64 20.01 28.02 C Y Y P Y
G-22 1370 37 1.64 14.01 28.02 C Y N P Y
G-23 1500 24 1.64 14.01 21.00 C/R Y Y P Y
G-24 1520 27 6.56 C/R Y N R N
G-25 1220 27 1.97 45.02 50.00 C N Y P Y
G-26 1320 29 1.64 17.00 50.00 C N N P Y
G-27 1360 28 1.97 23.00 19.00 C N N P N
G-28 1450 34 3.28 17.00 25.00 C N Y R N
G-29 1500 30 4.92 33.01 29.00 C/R Y Y P N
G-30 1330 24 3.28 80.02 65.03 C N Y P N
G-31 1560 28 3.28 31.01 43.01 C Y N P Y
G-32 1560 29 3.94 12.99 37.01 C Y N P Y
G-33 1700 30 2.62 25.00 27.00 C Y Y P Y
G-34 1700 32 1.64 48.00 35.01 C Y N P Y
G-35 1620 29 4.92 34.02 23.00 C N N R Y
G-36 1500 25 2.62 21.00 35.01 C Y N P Y
G-37 1520 27 3.28 10.99 10.01 C Y N P Y
G-38 1120 28 1.64 24.02 38.03 C Y Y P N
AVERAGE 29.80 5.59 41.55 57.36
MEDIAN 30.00 3.28 32.81 44.95
STD DEV 3.74 5.71 35.32 50.15
MAX 41.00 49.22 300.21 492.15
MIN 17.00 0.33 6.56 6.56
NON-FAILURE SOURCE AREAS
G-1b 960 31 N
G-2b 1090 29 Y
G-4b 1220 35 Y
G-5b 960 35 N
G-6b 900 29 N
G-8b 1820 28 Y
G-10b 1940 32 N
G-12b 1640 31 Y
G-15b 1720 35 Y
G-16b 1180 28 Y
G-16c 1180 30 Y
G-19b 1380 30 N
G-22b 1370 30 Y
G-28b 1450 38 N
G-29b 1490 32 Y
G-35b 1520 25 Y
G-37b 1530 29 N
AVERAGE 31.00
MEDIAN 30.00
STD DEV 3.14
MAX 38.00
MIN 25.00
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