Pseudoseisms from Military Exercises — Krivoy, Johnson, and Koyanagi 
121 
TABLE 1 
Arrival Times at Summit Stations of Sonic Disturbances 
from the Events of 19 December 1961 
(Numbers in parentheses are recorded double-amplitudes, in millimeters) 
desert uwekahuna ahua mauna loa 
18 - 29 - 06 . 3 ( 3 ) 
29 - 35 . 3 ( 3 ) 
31 - 37 . 2 ( 6 ) 
31 - 42 . 8 ( 14 ) 
35 - 42 . 8 ( 4 ) 
39 - 54 . 3 ( 12 ) 
54 . 6 ( 5 / 2 ) 
40 - 36 . 9 ( 7 ) 
40 - 39 . 8 ( 10 ) 
40 - 58 . 3 ( 34 ) 
59 . 1 ( 4 ) 
43 - 16 . 8 ( 23 ) 
17 . 5 ( 3 ) 
43 - 46 . 7 ( 38 ) 
47 . 5 ( 2 ) 
44 - 24 . 8 ( 19 ) 
26 . 3 ( 1 ) 
44 - 56 . 3 ( 21 ) 
57 . 0 ( 2 ) 
47 - 32 . 8 ( 8 ) 
33 . 5 ( 5 / 2 ) 
47 - 56 . 9 ( 7 ) 
57 . 8 ( 4 ) 
48 - 28 . 8 ( 47 ) 
30 . 0 ( 8 ) 
48 - 49 . 5 ( 21 ) 
50 . 1 ( 2 ) 
51 - 41 . 5 ( 5 ) 
42 . 0 ( 5 / 2 ) 
52 - 07 . 5 ( 14 ) 
08 . 0 ( 3 ) 
52 - 40 . 6 ( 10 ) 
41 . 4 ( 2 ) 
55 - 48 . 1 ( 11 ) 
48 . 6 ( 5 / 2 ) 
56 - 21 . 0 ( 4 ) 
21 . 5 ( 4 ) 
56 - 46 . 3 ( 5 ) 
46 . 7 ( 4 ) 
59 - 09 . 2 ( 2 ) 
59 - 48 . 5 ( 5 ) 
49 . 4 ( 7 / 2 ) 
19 - 26 - 42 . 1 ( 10 ) 
40 . 6 ( 4 ) 
27 - 14 . 1 ( 18 ) 
16 . 3 ( 2 ) 
27 - 49 . 5 ( 27 ) 
49 . 5 ( 5 ) 
30 - 57 . 0 ( 2 ) 
31 - 40 . 3 ( 5 ) 
40 . 6 ( 4 ) 
32 - 37 . 4 ( 12 ) 
37 . 7 ( 6 ) 
35 - 14 . 0 ( 5 ) 
16 . 3 ( 3 / 2 ) 
36 - 08 . 1 ( 5 ) 
07 . 2 ( 2 ) 
36 - 58 . 5 ( 3 ) 
38 - 56 . 1 ( 10 ) 
56 . 4 ( 4 ) 
39 - 51 . 0 ( 22 ) 
50 . 5 ( 5 ) 
41 - 01 . 1 ( 19 ) 
01 . 2 ( 6 ) 
48 - 53 . 8 ( 3 / 2 ) 
20 - 34 - 35 . 8 ( 2 ) 
48 . 6 ( 1 ) 
40 - 11 . 6 ( 5 ) 
18 . 1 ( 5 ) 
41 - 16 . 0 ( 14 ) 
34 . 5 ( 21 ) 
44 - 04 . 6 ( 16 ) 
42 . 5 ( 4 ) 
45 - 14 . 1 ( 6 ) 
22 . 1 ( 5 / 2 ) 
48 - 14 . 5 ( 2 ) 
45 . 6 ( 7 ) 
49 - 06 . 9 ( 2 ) 
47 - 53 . 2 ( 2 ) 
58 . 7 ( 5 ) 
24 . 9 ( 6 ) 
51 - 31 . 5 ( 1 ) 
04 . 9 ( 3 / 2 ) 
56 - 05 . 4 ( 3 ) 
12 . 0 ( 5 ) 
38 . 3 ( 4 ) 
55 - 45 . 0 ( 5 / 2 ) 
57 - 03 . 6 ( 5 / 2 ) 
10 . 1 ( 3 / 2 ) 
00 - 07 . 5 ( 3 ) 
57 . 6 ( 8 ) 
31 . 5 ( 5 / 2 ) 
28 - 06 . 4 ( 8 ) 
55 . 6 ( 1 ) 
53 . 0 ( 3 / 2 ) 
33 . 7 ( 2 ) 
04 . 0 ( 2 ) 
25 . 7 ( 3 ) 
35 - 31 . 8 ( 2 ) 
39 - 13 . 4 ( 5 ) 
40 - 08 . 5 ( 11 ) 
39 - 15 . 2 ( 3 / 4 ) 
18 . 6 ( 5 ) 
amplifier was increased greatly. The gain on the 
Ahua amplifier was also increased. The data 
listed in Table 2 generally bear out the observa- 
tions suggested by Table 1. In Figure 3 are 
shown other locations at which there are instru- 
ments similar to that at Uwekahuna. It is 
interesting that such instruments on Maui and 
at Kamuela, Naalehu, Hilo, and Pahoa on 
Hawaii all failed to record these events. Further- 
more, residents and police at these places, as 
well as along the west and northeast coasts of 
Hawaii, who were questioned later, reported no 
unusual sensations. 
On 13 February 1962, 15 additional events 
were recorded. The observatory had been alerted 
to expect these events; and so, while they were 
recording, the staff phoned about six of the 
Hilo residents who had reported alarming sen- 
sations during the morning of 20 December 
1961. Of those called, only one thought that 
a similar event had just taken place, although 
no concern or alarm was engendered. This third 
