Table 1. Landslide densities, mean recurrence intervals, and probability (percent chance) of one or more landslides occurring during a specified time in the future. Exceedance probabilities of 100 percent have been rounded up from values that were greater than 99.995.
Density (number of landslides per 4 hectare count circle) |
Mean Recurrence Interval (years) |
Exceedance Probability (percent chance of one or more landslides during a specified time) |
|||||
1 yr. |
5 yrs. |
10 yrs. |
25 yrs. |
50 yrs. |
100 yrs. |
||
1 |
88.40 |
1.12 |
5.50 |
10.70 |
24.63 |
43.20 |
67.74 |
2 |
44.20 |
2.24 |
10.70 |
20.25 |
43.20 |
67.74 |
89.59 |
3 |
29.47 |
3.34 |
15.61 |
28.78 |
57.19 |
81.67 |
96.64 |
4 |
22.10 |
4.42 |
20.25 |
36.40 |
67.74 |
89.59 |
98.92 |
5 |
17.68 |
5.50 |
24.63 |
43.20 |
75.68 |
94.09 |
99.65 |
6 |
14.73 |
6.56 |
28.78 |
49.27 |
81.67 |
96.64 |
99.89 |
7 |
12.63 |
7.61 |
32.69 |
54.70 |
86.19 |
98.09 |
99.96 |
8 |
11.05 |
8.65 |
36.40 |
59.54 |
89.59 |
98.92 |
99.99 |
9 |
9.82 |
9.68 |
39.89 |
63.87 |
92.15 |
99.38 |
100 |
10 |
8.84 |
10.70 |
43.20 |
67.74 |
94.09 |
99.65 |
100 |
11 |
8.04 |
11.70 |
46.32 |
71.19 |
95.54 |
99.80 |
100 |
12 |
7.37 |
12.69 |
49.27 |
74.27 |
96.64 |
99.89 |
100 |
13 |
6.80 |
13.68 |
52.06 |
77.02 |
97.47 |
99.94 |
100 |
14 |
6.31 |
14.65 |
54.70 |
79.48 |
98.09 |
99.96 |
100 |
15 |
5.89 |
15.61 |
57.19 |
81.67 |
98.56 |
99.98 |
100 |
16 |
5.53 |
16.56 |
59.54 |
83.63 |
98.92 |
99.99 |
100 |
17 |
5.20 |
17.49 |
61.77 |
85.38 |
99.18 |
99.99 |
100 |
18 |
4.91 |
18.42 |
63.87 |
86.95 |
99.38 |
100 |
100 |
19 |
4.65 |
19.34 |
65.86 |
88.34 |
99.54 |
100 |
100 |
20 |
4.42 |
20.25 |
67.74 |
89.59 |
99.65 |
100 |
100 |
21 |
4.21 |
21.14 |
69.51 |
90.70 |
99.74 |
100 |
100 |
22 |
4.02 |
22.03 |
71.19 |
91.70 |
99.80 |
100 |
100 |
23 |
3.84 |
22.91 |
72.77 |
92.59 |
99.85 |
100 |
100 |
24 |
3.68 |
23.78 |
74.27 |
93.38 |
99.89 |
100 |
100 |
25 |
3.54 |
24.63 |
75.68 |
94.09 |
99.91 |
100 |
100 |
26 |
3.40 |
25.48 |
77.02 |
94.72 |
99.94 |
100 |
100 |
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