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Table 2.4 Estimated upper bounds to seismic ground motion (x=displacement, v=velocity, a=acceleration) expected at
distance r km from a 4500lb TNT (2041.17 kg) underwater explosion. The calculations assume a local seismic magnitude
value, HL, of 3.74. This value is selected as the largest compatible with the size of the charge.
Site Range -log Ao log A A x v a 2
d km mm microns mmls mmls
0 1.4 2.34 3742.59 1336.64 83.9835 5276.84
5 1.4 2.34 1245.80 444.93 27.9557 1756.51
PUSS 1 10 1.5 2.24 414.69 148.10 9.3056 584.69
PUSS 2 15 1.6 2.14 138.04 49.30 3.0976 194.63
20 1.7 2.04 109.65 39.16 2.4605 154.60
PUSS 3 25 1.9 1.84 69.18 24.71 1.5525 97.54
30 2.1 1.64 43.65 15.59 0.9795 61.55
35 2.3 1.44 27.54 9.84 0.6180 38.83
PUSS 4 40 2.4 1.34 21.88 7.81 0.4909 30.85
45 2.5 1.24 17.38 6.21 0.3900 24.50
(]I 50 2.6 1.14 13.80 4.93 0.3098 19.46
(]I
55 2.7 1.04 10.96 3.92 0.2460 15.46
BGS/VHS 60 2.8 0.94 8.71 3.11 0.1954 12.28
65 2.8 0.94 8.71 3.11 0.1954 12.28
70 2.8 0.94 8.71 3.11 0.1954 12.28
75 2.9 0.84 6.92 2.47 0.1552 9.75
80 2.9 0.84 6.92 2.47 0.1552 9.75
PUSS 5 85 2.9 0.84 6.92 2.47 0.1552 9.75
90 3.0 0.74 5.50 1. 96 0.1233 7.75
95 3.0 0.74 5.50 1.96 0.1233 7.75
100 3.0 0.74 5.50 1. 96 0.1233 7.75
Note: A is displacement in mm on a standard torsion seismometer and A is a standardising distance correction term for
local magnitude calculation (see text for details). 0