42 
The N.Z. Journal of Science and Technology. 
[Jan 
No. 
Date. 
Commence¬ 
ment. 
Maximum. 
Maximum 
Amplitude. ' 
Duration. 
Remarks. 
1915. 
H. M. 
H. M. 
Mm. 
H. M. 
10 
June 6 
7 12-5 
, . 
. . 
Pi- 
7 20-0 
• . 
. . 
Po. 
7 25-1 
7 29-5 
1-0 
p 3 . 
D uncertain. 
11 
June 11 
3 37-8 
» • 
Pi. 
3 41-5 
Po. 
3 44-0 
3 45-0 
0-3 
p 3 . 
3 49-0 
0-4 
Second maximum. 
0 50 
D. 
12 
July 28 
9 06-8 
. . 
. . 
Pi. 
9 08-5 
. • 
P 2 
9 09-5 
9 13-0 
2-0 
P 3 . 
9 16-6 
2-5 
Second maximum. 
1 50 
D. 
13 
July 31 
1 47-5 
. . 
Pp 
1 56-0 
. . 
. . 
P 2 . 
2 19-2 
2 32-4 
5-0 
P 3 . 
3 00 
D approximate. 
14 
Aug. 1 
. • 
2 57-0 
<0-2 
Quite local shock; felt Sumner. 
15 
Aug. 3 
13 13-4 
. . 
. . 
Pi- 
13 20-6 
. . 
P 2 - 
13 32 0 
13 39-7 
6-6 
P 3 . 
3 10 
D. 
16 
Sept. 7 
1 35-5 
. . 
. . 
Pi- 
1 39-8 
. . 
Po. 
1 460 
1 47-0 
30 
S. (Guatemala earthquake.) 
1 49-4 
1 50-5 
30 
Y. 
2 09-0 
2 19-0 
15-0 
P 3 . 
5 33 
D (B.P. 16-3 seconds). 
17 
Sept. 13 
18 14-6 
. . 
• . 
Pi ? 
18 16-0 
18 18-0 
1-4 
P 3 . 
0 30 
D. 
18 
Oct. 3 
7 56-0 
8 05-0 
4-0 
P 3 . 
D uncertain. 
19 
Oct. 20 
22 26-6 
22 27-3 
22-0 
Near felt shock. 
0 50 
D uncertain. 
20 
Oct. 20 
23 20-6 
23 21-7 
<0-2 
Local shock ; minute. 
0 04 
D. 
21 
Oct. 31 
8 31-2 
. . 
Pi- 
8 35-0 
8 38-3 
3-0 
P 3 . 
• 
1 00 
D approximate. 
22 
Nov. 1 
7 37-2 
. . 
. . 
Pi. 
7 47-0 
• o 
Po. 
7 58-6 
8 20-6 
. # 
p 3 . 
1 00 
D approximate. 
23 
Nov. 1 
17 57-0 
P]. Near shock. Record like 
No. 19. 
• 
. 
17 57-4 
17 58-7 
. . 
P 3 . 
0 10 
D uncertain. 
Note. —The record of the Guatemala shock (Sept. 7) is of especial interest. The 
distance of origin is approximately 105°, and the S and Y phenomena are well marked 
(British Association adopted notation). The difference of times of the S and Y 
phenomena exceeds three minutes contrary to expectation. PR^ (B.A. notation ) 
is at 1 39-8, agreeing well with Malta and Iskutate records. S agrees well with B.A. 
calculated time of arrival; Y, however, appears later than theoretical time of arrival. 
A Milne-Shaw instrument would probably be better for the identification of these 
more delicate phenomena. 
