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Volume 44, 1911
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– 441 –

Records of Milne Seismographs, 1906–1911.
Records of the Milne Seismographs Nos. 16 and 20, taken at Christchurch and Wellington by H. F. Skey and G. Hogben.

P1, first phase; P2, second phase; P3, P4, P5, large waves. Time is Greenwieh mean civil time, given in hours, minutes, and decimals of minutes; 0 or 24R. = midnight. B.P., boom period.

Records of Milne Seismograph No. 16, at the Magnetic Observatory, Christchurch, New Zealand. (Latitude, 43° 32′ S,; longitude, 172° 37′ E. Director, Henry F. Skey, B.Sc.)

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Date. Commencement Max. Max. Amplitude. Duration. Remarks.
1906. H. m. H. m. Mm. H. m.
Jan. 3 2 03·7 2 09·9 0·4 1 10
" 4 4 08·7 4 33·5 0·3 0 51
" 18 1 35·3 0 28 Thickening of line.
" 22 4 16·9 4 23·1 1·5 0 44
" 24 7 46·2 0 49 Thickening of line.
" 24 22 01·2 22 04·3 0·4 End between 22h. 09·4m. and 22h. 13·6m. while attending instrument.
" 25 1 53·9 0 16 Slight thickening.
" 30 23 00·5 Slight swelling.
" 31 ? 16 03·0 15·5 ? ? P2. Beginning and end obscured by tremors.
Feb. 1 2 30·9
2 36·1 2 39·2 2·95
2 42·3 1 09
" 2 0 21·6 0 19 Thickening of line.
" 5 4 29·1 P1.
4 33·2 4 34·3 3·45 1 15
" 8 0 20·7 0 52 Thickening of line.
" 10 9 16·3 9 29·7 0·4 0 22
" 12 6 46·2 P1.
6 49·3 6 53·4 1·5 0 52
" 14 0 40·7 0 45·9 1·0 0 26
" 16 23 28·7 P1.
23 32·8 23 38 0 1·4 0 56
" 19 2 07·2 P1.
2 12·4 2 22·7 17·0+
2 24·1 2 54
" 20 6 07·2 6 11·8 0·2 0 14
Mar. 3 ? 9 51·3 0·7 ? Beginning and end obscured by night tremors.
" 8 21 27·5 21 32·7 0·5 0 09
" 9 ? 19 32·6 5·4 ? Beginning and end obscured by night tremors.
" 10 6 40·8
6 48·1 6 51·2 5·3 ? Beginning and end obscured by night tremors.
– 442 –

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Mar. 10 16 33·6 1635·7 8·5 ? Beginning and end obscured by night tremors.
" 11 3 35·7 3 38·8 0·85 0 36
" 11 8 49·1 8 52·2 0·9 0 30
" 11 ? 21 52·4 0·5 ? Beginning and end obscured by tremors.
" 20 2 24·8 2 34·1 0·45 ? End obscured by second quake.
" 20 3 31 0 3 32·5 0·75
3 33·6 0 57
(Mean boom period, 15·4 sec. 1 mm. = 0·66″ of tilt.)
April 14 4 02·9
4 07·5 4 11·1 17·0+ 1 56 ? Origin, New Hebrides.
" 18 13 33·6 San Francisco. Subsequent tremors at 17 17·6, 18 19·7, 19 20·7.
14 01·0 14 30·0 6·7 3 21
" 19 6 15·4
6 21·6 7 10·3 7·0 4 09
" 29 6 44·9 6 47·0 0·4 0 38
May 2 13 18·1 13 24·8 1·4 0 41
" 12 8 11·5 8 13 1 0·45 0 21
" 13 12 01·3 0·55 Small and in middle of night tremors.
" 15 13 23·2 0·5
" 17 5 28·4 5 34·6 1·2 0 42
" 18 23 41·9 23 43·9 0·9 0 28
" 19 0 41·9 0 43 9 0·45 0 22
" 19 2 31·5 2 32 6 0·4 0 26
" 19 11 38·8 0·8 In middle of night tremors.
" 21 12 58·8 13 16·9 1·0 0 46 B.P., 15·1 sec
June 1 4 40·2 B.P., 15 sec.
5 01·4 5 02·9 3·5 0 43
" 2 4 29·8 4 34·0 0·5 0 56
" 2 6 28·8 0 18 Thickening of line.
" 2 14 43·2 14 48·4 0·9 ? End obscured by night tremors.
" 5 0 28 0 0 32·2 0·5 0 48
" 6 0 00·1 0 04 Very slight.
" 9 23 18·6 0 04 Very slight thickening.
" 22 ? 12 35·2 0 4 ? In middle of night tremors.
" 24 7 38·1 7 49·5 0·35 0 25
" 30 10 21·5 0 05 Thickening merely.
July 12 10 21·5 10 41·0 0·1 0 42
" 12 11 21·5 Very slight thickening.
" 17 ? 15 45 7 0·4 Beginning and end obscured by night tremors.
15 52 9 ?
" 19 8 19·6 8 24·7 0·1 0 18
" 22 7 18 7 7 25·9 0·4 0 16
" 22 8 14·1 0 05 Very slight.
" 23 6 26·2 6 41·6 0·35 0 43
" 31 11 32 5 11 39 6 0 45 0 24
Aug. 3 3 20·3 3 21 8 0 9 0 41
" 3 4 53·4 Slight swelling.
" 5 1 24·0
1 27·1 1 28·6 3·4 0 58
" 7 22 46·8 22 48·6 0 35 0 11
" 8 1 13·6 1 18·8 0·25 0 18
" 9 11 20·1 11 23·2 0·6 0 15
" 12 6 25·8 6 27·8 0·2 0 14
" 12 9 25 8 9 36·0 0·25 0 30
– 443 –

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Aug. 17 0 33·3 Valparaiso.
0 57·3 1 36·1 Subsequent tremors: 6 33 to 7 14, minute; 7 41 to 8 07, minute; 9 22 to 10 12, minute; 13 23 to 13 25 large; and minute to 14 15·2.
1 39·8
1 44·4 12·0 4 18
" 18 6 56·8
7 01·5 7 03·5 1·85 1 39
" 22 ? P1. Beginning and end obscured by continuous tremors.
19 45·6 19 48·7 5·4 ?
" 23 1 44·6 1 48·8 0·8 0 21
" 23 16 29·6 16 30·6 1·25 ? P1. Beginning and end obscured by continuous tremors.
" 26 6 16·7
6 30·7 6 34·8 3·3
6 45·2 2 23
" 30 3 03·5
3 38·7 3 46 5 1·4 1 28
Sept. 6 19 06·0 B.P., 15 sec.
19 11·2 19 11·7 2·4 0 10
" 14 13 34·8 13 53·0 0·8 ? End obscured by night tremors.
" 14 16 12·1
16 19·3 16 30·2 20·2
16 31·7
16 35·9 ? End obscured by night tremors.
" 15 2 43·2 0 03
" 16 4 24·2 4 26 8 04 0 12
" 17 8 52·8
9 02·6 9 06·2 3·2 ? End obscured by night tremors.
" 21 1 28·0
1 49·7 1 53·3 1·7 0 27
" 21 20 08·2 Minute tremor. Shock noted at 20 10·0 at Christchurch, Cheviot, and Kaikoura.
" 29 ? 14 12·7 0·8 ? Probably night tremors.
Oct. 2 0 10·2 0 13·8 0·3 0 33 B.P., 15 sec.
" 2 1 59·8
2 07·1 2 22·1 17·0+ 3 18 Subsequent tremors.
" 2 ? 12 34·0 0·85 ? Possibly night tremors.
" 2 ? 14 51·6 0·85 ? Possibly night tremors.
" 3 0 18·1 0 29·4 0·4
0 45 5 1 03
" 4 5 06·5 0 10 Thickening of line.
" 11 5 18·8 5 36·9 0·4 0 55
" 18 3 06·3 0 19 Thickening of line.
" 27 3 52·5 4 08·0 0·45 0 30
" 29 1 33·9 1 58·5 0·4 0 55
Nov. 5 23 06·2 23 34·2 0·95 1 16 B.P., 15 sec.
" 9 ? P1. Beginning and end obscured by night tremors.
15 09·6 15 11·5 2·8 ?
" 10 5 16·2 5 26·5 1·1 0 41
" 12 4 12·5 4 14·6 2·5 0 09
" 14 ? P1. Beginning and end obscured by night tremors.
17 50·2 17 57·9 5·6 ?
" 19 7 31·0
7 39·6 8 01·7 10·0
8 07·3 3 27
" 19 22 05·6 22 10·7 1·2 0 52
– 444 –

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Dec. 7 23 51·1 23 52·1 0·9 0 12 B.P., 15 sec.
" 15 3 12·2 0 29 Thickening of line.
" 17 22 09·4 22 12·6 0·76 0 59
" 18 ? P1. In middle of continuous tremors.
20 30·1 20 30·6 2·5
20 35·7 ?
" 19 0 31·6
0 36·8 0 44·5 8·5 3 18
1907
Jan. 4 5 31·9
5 43·4 6 07·0 4·5
6 12·2
6 22·6 3 55
" 7 ? P1. Beginning and end obscured by night tremors.
13 59·5 14 02·7 14·0 ?
" 8 5 42·0 6 21·3 0·5 1 36
" 14 9 54·7 9 56·8 1·0 0 37
Feb. 3 ? B.P., 15 sec. Beginning and end obscured by night tremors.
20 01·3 20 01·8 2·05 ?
" 16 21 23·4
21 29·1 21 31·7 4·5 1 32
" 27 9 19·1 Very small.
9 21·1
Mar. 13 0 46·3 1 03 B.P., 15 sec. Thickening of line merely.
" 15 5 08·4 5 10·0 0 07 Very slight.
" 18 7 34·9 0 10 Minute.
" 27 0 59·1 0 32 Minute swellings.
" 29 6 06·8 6 08.6 1·25 0 08
" 31 ? 22 13·8 In middle of night tremors.
22 17·9 2·5 ?
April 7 9 54·4 10 02·7 ? Followed by continuous tremors.
" 15 6 32·5
7 02·0 7 30·9 4·1 2 53
" 18 21 11·4
21 39·8 21 48·6 1·5 1 39
" 19 0 07·2
0 32·0 0 36·2 1·5 1 53
" 20 2 13·5 2 21·8 1·3 1 14
" 22 ? 18 10·7 0·7 ? In middle of night tremors.
" 24 23 40·9
24 02·6 24 04·7 1·1 0 58
May 4 5 58·3
6 08·7 6 18·0 2·7 ? End obscured by night tremors.
" 9 8 29·9 8 33·0 0 07 Very slight.
" 12 ?
8 04·6 8 06·1 1·1 ? Beginning and end obscured by night tremors.
" 13 ? Ditto.
21 23·5 21 26·7 1·9 ?
" 14 3 50·3 4 02·9 0·45 0 32
" 17 1 22·6 1 24·6 0·4 0 09
" 23 ? 11 21·8 0·4 ? In middle of minute night tremors.
" 27 5 08·6 End obscured by night tremors.
5 13·5 5 13·8 1·4
5 15·8 ?
" 30 ? 22 04·9 0·7 ? In middle of continuous tremors.
" 31 ? Beginning and end obscured by night tremors.
12 51·8 12 58·0 4·9 ?
June 5 3 46·2 4 23·9 0·4 1 54
– 445 –

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June 13 9 57·2 10 10·7 0·7 1 52
" 13 12 17·9 12 21·0 0·3 0 18
" 18 9 06·3 9 07·9 1·9 0 11 Felt in towns south of Timaru.
" 19 17 28·6 0 05 Very small, carrot-shaped.
" 19 19 03·8
19 30·7 19 32·2 1·9 1 34
" 27 ?
22 43·0 22 49·2 6·0± ? In middle of continuous tremors.
July 18 0 48·1 0 51·2 0·26 0 20
" 18 5 06·7 5 10·8 0·8 0 38
" 20 14 21·5 0·8 In middle of night tremors.
" 29 0 55·7 1 27·3 0·6 0 25
" 29 19 51·4 20 11·0 0·4 0 53
Aug. 4 6 39·1 6 44·8 0·3 1 10
" 5 7 02·7 7 04·7 0·3 1 10
" 13 21 54·4
22 05·7 22 06·8 2·4 1 17
" 16 3 57·7 Small, sudden.
" 18 6 17·6 6 21·7 . 0 15 Swelling.
" 19 6 09·5 6 16·8 0 21 Very small.
" 23 7 10·0 7 13·1 0 28 "
" 23 13 38·0 13 47·3 0·1 0 23
" 28 19 20·8 19 23·9 0·3 0 50
" 31 8 43·8 8 48·9 0·3 0 16
Sept. 2 16 26·3
16 54·3 16 55·7 1·5 ? After.tremors for about two hours.
" 15 5 28·3
5 32·9 5 36·6 2·2 1 30
" 24 6 00·7 0 32 Thickening of line.
" 24 16 58·6 17 03·8 1·4 0 34
" 29 5 03·8 0 08 Swelling.
Oct. 2 1 35·6 2 05·8 1·9 B.P., 15 sec.
2 07·7 1 49
" 10 ?
22 05·1 22 05·8 3·5 ? In middle of continuous tremors.
" 11 ? 14 54·0 5·9 ? In middle of night tremors.
" 17 4 15·6 4 18·1 0·2 0 19
" 17 9 00·2 9 02·3 0 4 0 08
Nov. 3 ? Beginning and end obscured by night tremors.
18 06·3 18 10·9 2·5 ?
" 8 12 37·9 12 43·1 0·4 ? Followed by continuous tremors.
" 8 21 49·3 21 59·7 0·3 0 23
" 12 7 10·0 7 14·2 0·9 1 12 Followed by continuous tremors.
" 13 3 26·7 3 34·9 0·8 1 03
" 19 4 54·6 4 59·8 0·9 0 43
5 11·7
" 19 21 49·4 22 06·5 0·45 0 45
" 21 9 04·9 9 14·8 0·45 0 49
" 21 20 48·4 21 12·2 0·6 0 49
" 25 0 29·7 0 33·8 0·3 0 36
" 26 3 05·8 3 14·0 0·8 0 46
" 27 2 06·7 2 09·8 0·35 0 08
" 28 3 41·9 3 55·3 0·2 0 27
Dec. 11 1 09·0 1 27·3 0·6 0 53
" 12 22 13·0 22 18·0 0·1 0 06
" 15 ? Beginning and end obscured by night tremors.
17 55·3 18 07·8 4·8 ?
" 18 1 41·3 1 46·5 0·15 0 09
" 23 1 36·6 0 29 Thickening of line.
– 446 –

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Dec. 30 6 45·3
7 27·8 7 35·5 1·9 2 22
1908.
Jan. 19 7 33·7 7 42·0 0·1 0 33
" 20 0 46·5 0 06 Small, carrot-shaped.
" 24 0 46·8 0 53·0 0·9 0 56
Feb. 6 1 50·4 0 37 Thickening of line.
" 6 6 00·2 0 06 Small, carrot-shaped.
" 7 2 56·5 3 00·6 0·15 0 07
" 14 1 0301 1 06·2 0·7 0 24
" 24 23 57·8
24 01·5 24 02·5 1·6 0 38
" 27 0 21·6 0 03 Minute.
" 27 9 19·6 0 44 Swellings.
" 27 12 30·4 1·4 ? In middle of continuous tremors. Maximum appears at beginning of quake.
" 29 21 49·6 21 55 8 0·4 0 12
Mar. 5 2 28·8
2 52·1 2 59·8 1·6 1 53
" 15 ? Beginning and end obscured by night tremors.
10 19·4 10 20·4 2·7 ?
" 19 3 08·1 3 11·7 0·5 0 48
" 21 4 25·8 0 38 Thickening of line preceded and followed by minute tremors.
" 23 ? Beginning and end obscured by night tremors.
11 46·6 12 06·2 2·9 ?
" 26 23 16·3
23 27·6 24 09·0 4·25
24 29·7 2 59
" 27 4 11·6 4 53·5 0·55
5 15·2 2 07
April 7 1 26·2 1 37·5 0·5 0 43 B.P., 15 4 sec.
" 10 0 03·6
0 20·0 0 31·8 1·55 1 40
" 12 9 09·1 9 14·8 0·1 0 17
" 12 19 18·4 19 36·0 0·75 0 40
" 15 6 06·1 6 17·4 0·4 0 28
" 23 0 07·0
0 09·6 0 39·9 1·85 2 05
May 5 5 28·8 6 03·8 1·0
6 05·4 1 40
" 20 8 00·9 8 24·7 0·8 ? Followed by night tremors.
" 21 7 19·1 0 15 Slight.
June 3 ? 21 25·3 1 0 ? In middle of continuous tremors.
" 18 1 39·6 1 43·7 0·25 0 14
Aug. 17 10 50·8
10 59·5 11 28·4 5·5
11 34·1 2 44
Sept. 2 9 21 15·8 0·9 ? Beginning and end obscured by night tremors.
" 14 3 32·5 3 36·7 0·4 0 19
" 21 6 55·7 7 11·8 0·9 1 44
" 22 3 11·8 3 23·7 0·35 0 30
" 26 5 27·4
5 32·0 5 34·1 4·9 1 13
Oct. 7 1 00·7 1 21·9 0·8 0 46
" 13 5 31·0 1 42 Swellings.
– 447 –

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Nov. 11 21 22·3 21 30·0 1·0 0 59 Preceded by night tremors.
" 15 2 00·8 0 21 Slight swelling.
" 22 22 52·7 22 58·4 0·25 0 21
" 27 0 38·0 0 41·1 0·3 0 24
" 30 21 24·1 21 27·2 1·9 0 28
Dec. 1 3 05·4 0 38 Swellings.
" 2 15 12·6 15 15·6 0·25 0 23
" 7 2 00·3 2 06·9 0·15 0 28
" 8 0 26·1 0 26·4 6·0 Severe shook in North Canterbury and slight in South Canterbury.
0 27·5 0 15
" 16 6 07·7 0·4 In middle of continuous tremors.
" 28 4 40·9 4 55·3 0·6 2 22 Subsequent tremor at 7 17–1. Origin, Italy.
5 00·5
5 07·8
5 20·9
5 30·0
6 07·2
6 13·4
6 17·1
6 20·2
6 24·3
1909.
Jan. 1 4 11·7 0 07 Swelling.
" 3 21 46·5
21 51·2 21 52·2 6·4 In progress while attending to instrument.
21 54·3 0 23
" 17 3 17·9 3 28·2 0·4 0 25
" 21 2 38·4 2 47·7 0·5 0 29
" 23 3 49·6 1 37 Tremors.
" 28 0 38·5 0 04 Thickening merely.
" 29 0 59·8 1 15·9 0·3 0 45
" 29 ? 13 33·4 1·5 ? In middle of night tremors.
Feb. 11 ? Beginning and end obscured by night tremors.
18 24·2 18 25·8 2·3 ?
" 22 9 26·7
9 31·3 9 37·0 3·4 1 53
" 27 ? 13 33·4 1·5 ? Beginning and end obscured by night tremors.
Mar. 8 11 45·7 B.P., 15·4 sec. End obscured by night tremors.
11 56·0 11 56·5 1·9
11 59·1 ?
" 10 7 37·4 7 38·4 0·45 0 05
" 17 23 05·2
23 32·3 23 35·9 3·3 3 56
" 22 22 05·3
22 06·4 22 07·4 17·0+ 2 16 Direction N. and S. Felt in southern towns.
" 26 1 53·8 0 06 Maximum at beginning. Amplitude very slight. Felt in Christchurch; direction N. and S.
April 10 5 33·4 B.P., 15·5 sec.
5 43·8 5 45·9 6·0
5 46·9 2 05
" 12 1 14·3
1 18·5 1 22·6 3·95 1 29
" 22 7 14·8 7 15·8 0·2 0 27
" 27 12 54·7
13 09·0 13 19·3 6·8 2 01
– 448 –

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May 2 7 06·1
7 12·3 7 15·4 1·9 1 25
" 2 15 24·4 Very slight.
" 2 18 20·3
18 25·4 18 29·6 2·5 0 57
" 11 ? 13 21·7 1·75 ? In middle of air-tremors.
" 12 0 57·2 1 19·3 0·3 0 55
" 17 8 20·2 8 31·0 0·9 1 37
" 24 7 13·4 7 17·0 0·5 0 12
" 25 4 59·7 5 27·6 1·1 1 08
" 30 ?
21 35·9 21 37·9 2·9 ? Beginning obscured by air-tremors.
June 3 18 52·7
19 24·8 19 37·7 2·2 2 52
" 8 6 09·7 6 11·8
6 39·7 0·7
6 55·2
7 13·9 ? End obscured by air-tremors.
" 9 0 51·0 0 04 Very small; maximum at beginning.
" 12 20 25·5
20 29·1 20 34·3 7·5 1 36
" 14 7 31·1 7 38·4 0·4 0 22
" 15 1 19·8 0 40 Thickening merely.
" 26 9 35·8 9 36·6 0·1 0 04
" 27 7 22·0
7 30·3 7 35·5 4·7 1 59
" 28 ? 15 29·0 0·7 ? Beginning and end obscured by air-tremors.
July 1 13 03·7 13 10·9 0·3 0 28
" 2 6 25·9 6 28·5 0·1 0 31
" 5 ? 17 55·3 3·5 ? Beginning and end obscured by air-tremors.
" 10 13 40·3 13 42·8 0·4
14 11·3 0 33
" 26 22 06·6 22 08·1 0 16 Slight thickening.
" 27 4 34·6 4 36·1 0·2 0 29
" 30 11 16·5 11 16·5 0·8 First maximum at beginning.
11 31·2 2 34 ? Origin, Mexico.
Aug. 4 6 18·3 6 20·4 0·1 0 06
" 6 5 46·0 5 49·1 0·4 0 11
" 10 6 56·1 7 01·2 0·25 0 22
" 13 12 19·7 12 21·7 0·25 0 06
" 16 7 54·6 8 17·7 0·4 0 42
" 18 0 35·4
0 46·2 0 56·4 3·9 0 29 In progress while attending to instrument.
" 29 23 59·5 1 34 Thickening of line
Sept. 3 8 11·2 8 18·4 0·35 0 19 B.P., 15·5 sec.
" 25 12 29·6 12 32·7 0·5 0 14
Oct. 3 1 28·8 2 15 Thickening.
" 4 13 53·2 14 07·0 0·9 ? End obscured by air-tremors.
" 21 0 45·5 0 55 Thickenings.
" 23 ? 21 28·9 ? Beginning obscured by air-tremors.
" 27 1 32·3 1 33·3 0·35 0 36
" 30 10 33·8 11 02·0 0·9 ? End obscured by air-tremors.
Nov. 3 6 19·0
6 23·9 6 25·4 3·25 1 16
" 10 5 55·6 0 11 Thickening of line.
" 10 6 26·4
6 35·6 6 38·2 1·4 1 57
– 449 –

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Nov. 12 10 04·4 10 05·7 1·0 0 18 Severe shock; felt in Wellington, New Zealand.
" 14 9 47·3 9 49·7 0·15 0 07
" 27 21 19·1 0 28 Slight thickening. Possibly air-tremors.
" 28 1 07·8
1 14·5 1 15·6 1·6 1 24
" 28 8 28·3 8 34·0 0·5 0 31 Preceded and followed by minute air-tremors.
Dec. 3 3 25·0 3 33·3 0·9 0 40
3 34·8
" 8 9 17·6
9 23·8 9 25·8 2·1 1 01
" 9 ? Beginning and end obscured by air-tremors.
15 50·6 15 59·1 5·75 ?
" 9 21 23·3
21 27·4 21 31·0 2·0
21 32·3 0 40 ? Origin, Ladrone Islands.
" 9 22 04·0 22 29·0 1·0 1 21 "
" 9 ? ? Origin, Ladrone Islands. Began while attending to instrument.
23 49·1 24 03·0 1·4 ?
" 22 ?
13 01·3 13 02·8 5·9 ? Preceded and followed by air-tremors.
" 23 19 30·2 19 36·4 2·3 1 03
" 23 22 32·3 22 45·1 1·0 0 58
" 28 ? 19 56·5 1·0 ? In middle of air-tremors.
1910.
Jan. 10 ? 19 27·8 0·3 9 Beginning and end obscured by air-tremors.
" 13 0 22·2 0 34·6 0·45 0 42
" 15 ? 10 58·1 0·65 ? Beginning and end obscured by air-tremors.
" 15 22 52·9 0 20 Thickening of line.
" 19 15 01·1
15 07·7 15 09·3 1·5 1 22
" 29 5 03·7 5 11·9 1·0 1 01
" 30 3 49·2
3 52·2 3 54·0 17·0+ 2 31 ? Origin, Samoa.
Feb. 3 9 57·9 10 05·8 0·75 0 27
" 3 ? Beginning and end obscured by air-tremors.
16 50·7 16 51·9 17·0+ ?
" 4 14 07·5
14 09·9 14 14·2 17·0+ ? End obscured by air-tremors.
14 52·4 14 55·5 5·0 about ? Beginning obscured by air-tremors.
" 4 17 44·2
17 48·3 17 50·9 2·75 ? End obscured by air-tremors.
" 4 ?
18 46·3 18 47·8 1·4 ? Beginning obscured by air-tremors.
" 6 2 13·7 2 15·2 0·25 0 11
" 6 4 41·5 4 45·1 0·2 0 10
" 6 7 16·2 0 21 Thickening of line
" 7 23 03·2 23 04·7 0·1 0 10
" 13 10 04·9 10 08·5 0·45 0 34
" 15 1 27·1 1 31·2 0·25 0 31
Mar. 1 11 37·8 11 44·0 0·5 1 15
– 450 –

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Mar. 29 8 48·9 0·25 Sharp and sudden. Felt at Christchurch.
8 50·4 0 15
" 30 17 01·5
17 05·6 17 10·0 17·0+ ? End obscured by air-tremors.
" 30 23 59·4 24 02·7 0·4 0 28
" 31 5 37·2 5 40·9 0·2 0 14
April 1 13 35·3 14 27·8 0·9 1 38·5
" 4 5 23·7 0 08·2 Slight thickening.
" 8 ? 16 55·2 0·9 ? P1 and duration obscured by air-tremors.
" 12 0 50·3 0 50·6 1·5 1 04·4 Preceded and followed by minute air-tremors.
" 13 5 56·6 5 58·7 0·4 0 18·5
" 16 ? 13 09·3 ? P1 and duration obscured by air-tremors.
" 18 7 34 9 0 41·0 Thickening of line.
" 20 22 28 5 22 49·0 1 14·4 Preceded by continuous air-tremors.
" 23 ? 15 52·8 1·3 ? P1 and duration obscured by air-tremors.
" 27 2 16·3 0 35 1 Thickenings.
May 1 4 44·7 4 46·3 0·25 0 11·8
" 1 ? 18 45·7 5·5 ? P1 and duration obscured by air tremors.
" 5 0 57·4 1 09·8 0·2 0 41·0
" 6 23 22·9 23 29·1 0·4 0 38·0
" 8 18 25·2 18 34·4 0·1 0 20·0
" 10 18 32·7 0 35·4 Small swellings.
" 13 2 33·6 2 36·2 0·3 0 12·8
" 15 4 42·0 4 49·5 0·15 0 26·4
" 21 22 58·3 23 07·5 0·2 0 22·5
" 22 6 48·1 7 10·6 0·4 1 11·2
" 29 8 38·4 1 26·1 Minute tremors, possibly air-tremors.
" 29 11 12·2 0 06·1 Slight swellings.
" 31 5 19·8 5 21·3 0·15 0 06·6
" 31 5 32·6 6 01·8
6 09·3
6 22·9 0·7 1 29·2
June 1 6 00·7 6 12·5 5·1 3 00·0 ? Origin, Fiji.
" 2 10 30·5 10 32·0 0·2 0 06·1
" 5 5 02 6 5 04·6 0·1 0 27·1
" 9 6 50·0 0 05·1 Minute.
" 9 8 10·5 0 02·5 "
" 13 13 08·1 13 13·2 0·3 0 39·5
" 23 10 16·6 10 20·7 0·4 0 26·9
" 24 2 58·9 0 14·3 Very slight.
" 29 10 51·5 11 03·8
11 08·7 17·0+ ? End obscured by quake following.
" 29 ? 14 28·9 4·2 ? P1 obscured by preceding quake-ended 15th. 49·5m.
July 5 10 42·1 10 46·0 1·0
10 54·4 1·1
10 59·3 0·9 1 11·0
" 7 8 26·8 8 58·7 1·0
9 14·1 0·8
9 23 3 1·1 1 57·5
" 11 20 36·0 20 39·4 1·2
20 47·3 1·5 0 53·5
" 12 21 08·0 21 12·1 7·0
21 37·7 3·5 1 47·2
– 451 –

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July 15 12 08 5 12 14 0 1·0
12 21·8 1·0
12 25·3 1·0 1 19·5
" 15 21 48 7 21 51·9 02 Swellings.
21 56·7 0·3 0 14·8 Preceded and followed by minute tremors.
" 19 19 33·5 19 39·3 0·2
19 52·2 0·2 0 22·0
" 24 15 27·7 15 38·9 2·0 0 31·9
" 29 10 38·1 11 01·3 2·5
11 14·3 2·3 1 14·3
Aug. 5 15 38·3 15 39·5 0·6 0 05·9
" 10 20 49·6 21 08·2 0·4 0 38·3
" 21 5 36·3 5 53·6 7·0
5 55·1 5·0 2 31·1
Sept 7 7 33·9 7 51·4 7·0 1 25·0
" 9 9 00·0 9 19·8 5·1
9 28·4 3·0 0 55·3
" 10 12 21·9 12 33·4 1·4 0 38·3
Oct. 7 7 05·8 7 11·0 2·4 End obscured by air-tremors.
8 26·5 1·0 0 57·0
" 7 11 54·4 12 07·9 2·2 0 53·0
" 12 8 00·2 8 06·8 1·0 0 28·6
" 18 2 42·5 2 47·7 4·0 1 10·4
" 30 7 47·5 7 53·7 2·5 0 51·7
Nov. 9 6 09·8 6 32·1 17·5 3 03·1 Reproduced.
" 10 12 28·4 12 40·4 2·0 0 30·6 Duration doubtful owing to air tremors.
" 26 4 50·4 5 04·8 10·8
" 26 5 49·2 2 0
4 01·6 2·1 End obscured by air-tremors.
6 38·9 1·5 3 27·7
Dec. 1 3 52·3 3 55·4 0·6 0 16·5
" 2 3 20·2 3 26·4 1·5 0 25·9
" 3 7 58·3 8 04·5 16·4
8 38·0 1·0 1 21·7
" 3 4 13·8 4 30·3 0·8 0 21·7
" 4 11 05·4 11 10·6 17·0
11 30·0 3·5 1 45·6
" 10 9 37·4 9 47·0 17·5
10 00·2 5·0 11 36·3
" 11 3 57·0 4 04·2 0·7 0 20·5
" 12 23 55·9 0 21·7 0·8 0 42·3
" 13 12 25·6 12 58·6 1·6 1 16·5
" 14 20 54·4 21 02·7 1·5 1 07·3
" 16 14 55·3 15 26·3 5·1
15 41·8 3·5 2 17·6
1911.
Jan. 2 22 59·7 23 05·9 14·0 1 52·7
" 3 23 46·3 0 26·6 1·4 Duration uncertain.
" 4 1 05·9 1·5 2 33·8
" 7 2 33 2 3 05·2 1·0 1 13·5
" 8 16 24·7 16 27·8 0·8 ? End obscured by air-tremors.
" 8 9 26·8 9 32·0 2·5
9 41·4 1·5 0 38·2
" 10 16 37·7 16 46·2 7·4 0 55·0
" 16 9 08·8 9 37·8 1·0 0 41·4
Feb. 7 9 42·4 9 46·5 0·8 0 12·4
– 452 –

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Feb. 7 9 59·9 10 02·0 0·6 0 10·4
" 17 10 14·6 10 29·1 0·5 0 51·7
" 17 23 23·9 23 50·8 2·0 0 47·6
" 21 23 46·0 23 49·1 0·2 0 07·0
" 25 16 12·7 16 17·1 0·8 0 01·5
Mar. 11 3 29·5 3 43·9 1·5 0 52·7
" 17 9 28·2 9 30·3 1·0 0 07·3
" 21 4 04·2 4 22·4 0·2 0 42·5
April 6 9 55·1 10 01·3 0·3 0 14·5 Duration uncertain owing to tremors.
" 7 7 33·2 7 36·5 0·2
7 41·6 0·2 0 50·7
" 8 2 16·2 2 18·4 0·5 0 09·3 Excellent record.
" 11 13 40·0 13 41·9 1·5 0 24·0 In middle of tremors.
" 13 10 14·7 10 18·3 1·1 0 19·6 Excellent record.
" 15 4 59·9 5 05·0 2·5
5 13·4 1·6 0 50·5 L.W. commence 5h. 02·5m.
" 21 2 15·5 2 20·4 1·5
2 33·0 1·0 1 17·5
" 23 12 43·3 12 50·6 2·1 0 23·8 Duration uncertain.
" 26 1 18·3 1 27·5 0·4 0 59·5
" 27 3 03·3 3 04·8 0·2 0 06·9
May 1 12 27·4 12 32·6 0 3 0 10·3
" 20 16 19·6 16 20·4 0·2 0 06·3
" 23 4 33·1 4 37·8 0·1
4 40·3 0·1 0 19·2
June 3 20 39·1 1·5 Commencement and duration un certain owing to tremors.
20 41·6 2·0
20 45·6 1·7
20 47·5 1·5
" 6 13 05·1 13 06·6 0·5
13 12·6 0·5 0 18 0
" 7 11 17·5 11 31·5 0·7
12 00·5 1·0
12 09·5 0·8
12 14·5 0·8 2 52
" 10 17 00·8 17 07·6 1·1 1 14
" 12 7 12·6 7 17·6 0·1 0 14
" 15 14 36·4 14 46 9 5·5
14 48·7 4·0
14 52 4 3·0
15 04·5 3·8 3 08
" 28 19 57·3 19 40·4 1·5 0 28·5
July 12 4 19·1 4 38·0 2·1 L.W. begin 4h. 28 2m.
4 45·0 4·5
4 49·3 9 0 3 26
" 19 9 02·2 9 05·8 1·2
9 07·3 1·0 End obscured by tremors.
Aug. 6 1 26 0 1 28·6 0·4 0 17·5
" 10 0 33·4 0 45·9 0·4 0 31
" 16 22 51·2 23 18·3 9·0 L.W. commence 22h. 59·8m.
23 21·7 6·0
23 23·7 6·0
23 27·4 6·2 4 40·5
" 19 2 21·8 2 24·8 0·3 0 13 Duration approximate.
" 21 16 38·0 16 41·6 4·0 Duration obscured by tremors.
Sept. 6 1 17·9 1 20·7 0·6 1 12
" 12 14 07·7 1·5 Beginning and end obscured by tremors.
– 453 –

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Sept. 15 12 25·2 12 25·4 0·6 End obscured by following quake.
" 15 13 44·8 13 48·8 2·0 0 11
Oct. 5 7 38·9 7 41·3 1·0
7 44·5 0·5 0 55·4 Shock felt at Hastings, Hawke's Bay, New Zealand.
Nov. 2 0 56·2 1 01·1 2·1 0 33 End uncertain.
" 16 11 45·9 11 47·9 1·7
11 49·6 1·8 0 11·3
" 30 10 29·2 10 33·2 11·5 0 27 Duration uncertain owing to tremors.
Dec. 3 11 50·3 11 52·0 4·5 0 11·7
" 13 12 01·8 12 03·2 0·9 0 01·9 Small local quake.
" 23 21 52·4 22 09·0 1·1 End uncertain owing to tremors.

Note.—Previous to 11th May, B.P. = 14·5 secs. 1 mm. = 0·49″ static tilt.

On 11th May, 1911, the new type of recording apparatus giving a time scale approximately four times as open as the old type, was installed. With this recorder the time scale is 241 mm. to the hour.

After 11th May, B.P. = 16·5 secs. 1 mm. = 0·4” static tilt.

Principal Records of Milne Seismograph No. 20, at Wellington, New Zealand. (Latitude, 41° 17′ S.; longitude, 174° 47′ E. Observer, George Hogben.)

(The instrument is placed in a special room below a house standing about 30 ft. from the edge of a rocky cliff about 50 ft. high, situated about 250 yards from the shore-line of Wellington Harbour.)

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Date. Commencement Max. Max. Amplitude. Duration. Remarks.
1906. H. m. H. m. Mm. H. m.
Jan. 10 16 16·3 0·6 0 03 B.P., 19·6 sec.
" 26 8 04·2 P1. Several previous slight shocks.
8 21·1 8 21·8 3·8
8 26·5 0 57
" 31 15 00·4
15 57 6 16 03·3 1·2 3 23
16 22·6
Feb. 1 2 29·8 B.P., 19·6 sec.
2 33·9 2 34·2 2·8 0 18
" 3 9 55·1 8·0 0 04
" 19 ? P1.
2 17·3
2 27·0 2 30·9 10·0
2 48·0 1 45
Mar. 19 19 24·9 B.P., 19·6 sec. P1.
20 04·9 20 06·9 0·6 2 35 Probably Formosa.
" 28 17 13·2 P1.
18 11·5 18 13·8 16·0
18 24·5 13 36
April 5 22 37·8 B.P., 18·7 sec. P1. Previous tremors.
22 46·3 22 48·4 1·0
22 52·8 ?
– 454 –

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April 14 ? B.P., 19·6 sec. P1.
3 59·6 P2.
4 02·3 4 05·4 7·5
4 08·1 ?
" 18 13 26·6
13 30·1
14 01·9 P4 San Francisco earthquake.
14 10·5 14 11·9 9·0 P5
14 39 7 17 03 End overlapped by beginning of next quake.
" 19 6 27·3 P1 ?
7 06·1 7 08·4 8·5 Probably S.E. Asia.
7 15·1 1 30
June 1 4 43·6 B.P., 18·6 sec. P1.
4 47·8 P2.
5 02·3 5 07·3 2·1
5 24·0 1 12
" 2 4 28·1
4 30·6 4 33·7 0·6 0 41
" 27 0 39·1 P1.
1 56·5 2 00·2 0·6
2 02·1 ?
July 15 16 01·2 B.P., 18·5 sec. P1.
16 08·8 16 10·6 1·6
16 15·4 ?
" 17 15 37·3 P1.
15 38·9 P2.
15 41·0 15 42·8 1·1
15 49 1
" 18 ? P1.
19 42·4 19 43·3 0·5 P3.
19 48·2 ?
Aug. 5 1 00·6 B.P., 18·5 sec. P1.
1 14·9 P2.
1 22·7 1 24·8 1·5
1 31·4 3 01
" 8 5 13 5 5 14·6 0·5
" 17 0 27·2 P1.
0 33·5
1 19·6 1 23·8 18·0
2 03·8 29 03 Valparaiso earthquake; evidently two or three shocks overlap.
" 18 6 03·9 P1.
6 26·3 P2.
6 58·3 7 04·7 3·0
7 08·4 ?
" 23 16 23·5 P1.
16 26·6 16 29·4 0·6 ? Calabria.
16 35·5
" 23 19 41·2 B.P., 18·5 sec. P1.
20 05·8 P2.
21 47·3 21 51·0 0·8
" 26 ? P1; obscured by tremors.
6 30 0 6 35·7 3·2
6 40·5
Sept. 7 19 08·0 B.P., 18·5 sec. P1.
19 41·7 19 54·3 1·0
" 14 13 41·3 ? Obscured by tremors.
16 12·8 P2 ?
16 27·1 16 30·9 20·0 + 7 36 B.P., 15·9 sec.
– 455 –

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Oct. 2 1 58·6 B.P., 18·5 sec. Probably Indian. Ocean.
2 04·6
2 15·1 2 19·9 13·0 2 31
" 15 ? P1.
13 27·9 ? 2·5 ? Obscured by tremors.
" 21 2 05·1 P1.
2 17·6 2 19·9 13·0 1 56
" 29 1 39·8 P1.
1 52·4 1 53·6 1·4 ? Obscured by tremors.
" 30 19 13·7
19 18·5 19 19·4 1·0
19 23·6
Nov. 6 20 06·1 B.P., 18 5 sec. P1.
20 17·2 20 20·5 2·1
20 36·9
" 14 17 22·4 P1.
17 47·2 17 50·6 7·8
18 10·6 5 25
" 19 7 27·5 P1.
7 35·2 P2.
7 48·0 7 53·1 10·5
8 05·3
8 14·3 3 13
1909.
Mar. 17 23 17·4 Or P.T. commence 23 12·8, or even 23 05·0.
23 27·2 23 30·4 6·0 1·24 about
April 10 5 40·9
5 49·9 5 51·0 5·6 2 42
May 30 21 20·1 Repeats at 23 55·1, 24 53·5, 25 19·8, 26 26·0, &c.
21 32·2 21 35·5 4·0
June 11 10 09·4
11 02·1 ?11 16·8 0·5 2 02·6 S. France.
11 40·4 0·5
Nov. 3 6 21·7 6 26·5 2·0 0 15 Tremors before and after.
Dec. 9 15 45·2
15 55·8 .15 58·6 4·5
1910.
June 1 5 30·1 B.P., 13·5 sec. P1.
5 40·2 5 43·7 7·5 1 27 S.W. Pacific, near New Hebrides.
" 16 6 34·1 1 40 Probably S.W. Pacific, about 450 miles north of New Zealand. Followed by tremors and repeats. until 5 55 on 17th June.
6 45·2 6 49·3 14·5
" 29 10 50·5 Origin, 11° S., 172° E.
11 02·8 11 06·9 12·5 2 14
" 29 14 24·8
14 27·8 14 29·5 9·0 1 38 Origin, 51° S., 173½° E.
July 29 10 43·7 P1.
10 52·3 P3.
10 57·4 10 58·0 3·0 P5.
Aug. 18 12 40·5 P1 Local.
12 41·1 1·0 P3
" 31 21 49 5 17 40 Almost continuous tremors.
Sept. 7 7 04·5 P1 } Origin, 32° S., 179° W.
7 11·7 P2
7 28·7 P3
7 34·8 7 39·4 4·0 P5
– 456 –

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Sept. 9 9 13·4 P1.
9 19·2 P3.
9 25·2 9 27·4 1·8 P5.
Oct. 18 2 33·8 P1.
2 42·3 2 44·5 2·8 P3.
2 49·5 P5.
Nov. 9 6 07·3 P1
6 11·4 P2
6 13·3 P3 Origin, 17° S., 167° E.
6 15·4 P4
6 18·6 ? 170+ P5
" 26 4 46·5 P1
4 51·2 P3 Origin, 5° S., 165° E.
4 54·8 4 56·1 17·0+ P5
Dec. 10 9 38·1 P1
9 41·7 P3 Probable origin, 2° N., 146° E.
9 44·9 9 46·5 7·0 P5
" 13 12 03·2 P1.
12 37·5 12 49·8 6·3 Probably P5 or P3.
" 16 14 56·2 P1.
15 09·0 P3.
15 25·3 15 27·5 15 3 P5.
Note.—1 mm. of amplitude = 0·70″ of tilt (static).
1911.
Jan. 2 22 53·4 B.P., 18·3 sec.
22 59·2 0 41 Distance, about 2,100 km.
23 01·4 23 04·1 12·3
" 3 2 24·7
2 59·7
3 32·0 0·5
3 48·5 0·6
4 27·3
" 3 23 51·6 P1
24 14·5 P2?
24 28·2 P3? Turkestan.
24 42·7 P4?
24 45·2 24 46·7 4·0 P5
" 9 17 43·0 17 43·5 0·6 1 02 Local. Principal shock, 2·3 sec., Rossi-Ford, V.
" 10 16 35·9 P1
16 37·1 P2 Distance, about 1,200 km.
16 38 6 0 24 P3 B.P., 20·7 sec.
16 40·8 2·2 P5
April 17 23 08 0 P1
23 10·9 P2
23 12·6 0 10 about P3 Distance, about 1,500 km.
23 13·8 23 14·4 3 0 P5
" 21 2 16·2 P1
2 17·4 2
2 19·2 0 22 about P3 Distance, about 1,150 km.
2 20·5 2 22·5 1·4 P5
May 4 14 01·4
14 04·4 0 21 Distance, about 2,100 km.
14 09·7 14 12·8 1·0
" 5 23 59·0 P1 Distance, about 8,000 km.
24 22·4 1 02 P3 B P., 19·5 sec.
24 28·9 1·5 P5
Note.—1 mm. of amplitude = 0·70″ of tilt (static).
– 457 –

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June 7 11 27·8 B.P., 18·4 sec. P1.} Origin Mexico. Times uncertain.
11 49·8 P4.
11 53·7 11 56·2 13·0 2 30 P5. Long waves.
12 03·9 P8. Probably transverse waves.
" 10 16 59·1 17 00·1 1·2
" 17 04·1 17 05·2 0·8 0 07 ? Local.
"16 14 30·2
14 32·4 3 07 Beginning obsoured by tremors.
14 47·9 14 49·3 8·0
" 21 16 33·9
16 43·6 16 44·9 2·5 0 44
July 12 4 18·6 B.P., 17·5 sec. P1.
4 49·2 4 51·3 8·0 1 08 P5.
Aug. 16 22 51·4 B.P., 17·0 sec. P1.
23 00·0 P2.
23 12·8 3 18 P3.
23 15·7 23 16·7 7 0 P4.
23 19·5 23 22·2 10·0 P5.
Oct. 5 7 36·7 7 37·5 B.P., 12·5 sec. Origin, about 200–250 miles east of Wellington.
7 39·0
"17 9 41·9 9 46·4 2 0 0 36 ? Origin, about 550 miles from Wellington.