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Volume 38, 1905
– 568 –

Records Of Milne Seismographs.

Records of the Milne Seismographs Nos. 16 and 20, taken at Christchurch and Wellington, by Mr. Skey and Mr. Hogben.
Communicated by Mr. G. Hogben, M.A.
Plates LXI.-LXVII.

Records Of Milne Seismograph No. 16, At The Magnetic Observatory, Christchurch, New Zealand.

Latitude, 43°31′50″ S.; longitude, 172°37′18” E. Time employed: Greenwich mean civil time.

Time, G.M.C.T., as stated above. P.T., preliminary tremors less than 2mm. complete range; A.T., after-tremors less than 2mm. complete range; B.,E., beginning and end of vibrations not less than 2mm.; Amp., half-range in millimeters.

H.F. Skey

, Observer.

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Date. P.T. from B Maxima. Amp. E. A.T.till B.P. Remarks.
From To
1905 H. m. H.m. H.m. H. m. Mm. H.m. H.m. Secs.
January7 2 30·1 2 34·3 0·6 3 20·6
"8 23 07·9 Minute.
"13 13 48·9 2·8 In the middle of large night tremors.
"19 21 54·2 22 00·4 22 01·4 3·25 22 03·5 23 31·6
"20 22 58·3 23 04·0 0·8 23 25·5
"22 2 54·4 3 07·9 3 26·5 3 28·1 5·05 3 38·9 5 16·1
"22 9 27·7 9 29·3 0·9 9 52·0
– 569 –

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February 1 2 21·4 2 26·1 2 28·7 Very slight.
"13 Indefinite 5 44·0 5 46·1 2·45 5 51·8 7 17·6 P.T.came while attending to instrument, between 5·36 and 5·40.
"13 23 32·0 23 36·2 23 41·4 4·45 23 43·2 1 04·1
"14 1 13·4 1 17·5 0·7 1 34·1
"14 9 12·9 9 40·1 9 41·3 1·29 10 08·2 Indefinite A.T. obscured by night tremors.
"15 0 00·2 0 04·3 0 06·4 Very slight.
"15 1 35·9 1 40·0 1·4 2 13·7
"19 4 44·4 4 50·6 4 53·7 4 59·4 12·45 5 19·5 7 03·8
"20 11 50·7 11 58·7 12 08·2 Very slight.
"20 13 23·3 Thickening merely.
"20 14 22·0 14 30·5 Indefinite Very slight. A.T. obscured by night tremors.
"21 4 00·6 4 05·0 4 08·3 Thickening of line.
"26 2 38·1 2 45·4 2 46·4 2·5 2 50·8 Indefinite
"26 4 21·6 Short, sharp shocks.
"26 4 38·1 "
"26 5030 5 06·0 Very slight, thickening.
"27 Indefinite 17 32·6 17 39·6 3·5 18 00·3 Indefinite P.T. and A.T. obscured by night tremors.
March4 Indefinite 16 28·1 16294 2·3 16 38·9 Indefinite Ditto.
"4 Indefinite 18 53·6 19 00·7 2·4 19 06·9 Indefinite "
"4 23 25·5 23 40·0 23 44·6 7·4 24 07·9 Indefinite A.T. obscured by second quake.
"5 Indefinite 0 59·6 1 03·9 20 1 05·3 2 20·8 P.T. obscured by previous quake.
"17 2 00·7 2 02·8 045 2 23·5
"19 0037 0 09·4 0 18·0 0 18·7 17·0+ 1 39·4 3 50·3
"19 4 19·3 4 24·4 0·3 4 30·3 Very slight
"19 11 53·9 11 59·6 0·3 12 18·2 "
"19 13 09·9 13 15·6 0·05 13 23·9 "
– 570 –

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1905. H. m. H. m. H. m. H. m. Mm. H. m. H. m. Secs.
March22 4 02·7 4 29·6 4 30·1 1·9 5 12·6 6 38·9
"27 7 55·6 8 12·1 0·6 8 50·9
April2 Indefinite 1 45·7 0·5 Indefinite In the middle of continuous tremors.
"4 1 10·0 1 25·9 2 08·0 8·5 3 21·0 5 17·4 Origin northern India.
"9 4 55·4 5 02·1 0·3 5 11·9
"19 Indefinite 12 43·9 12 47·5 2·55 12 56·8 P.T. and A.T. obscured by night tremors.
"25 9 34·6 9 39·8 9 41·9 1·3 9 42·9 A.T.obscured by night tremors
May11 Indefinite 17 45·9 17 48·0 1·5 17 50·1 Indefinite P.T. and A.T. obscured by night tremors.
"15 4 05·4 4 09·0 0·5 4 24·5
"17 23 17·9 23 26·1 0·7 24 11·1
"18 Indefinite 14 00·8 14 11·2 6·9 14 37·5 Indefinite P.T. and A.T. obscured by night tremors.
"23 6 42·6 6 59·4 0·55 8 08·7
"25 3 47·0 4 03·6 0·5 4 33·6
"June 1 21 07·8 0·9 In the middle of continuous tremors.
"9 Indefinite 12 44·5 12 53·8 2·35 12 56·3 Indefinite P.T. and A.T. obscured by night tremors.
"11 5 22·5 5 22·6 5 31·8 2·9 5 42·7 6 53·5
– 571 –

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June 14 Indefinite 11 36·9 11 46·6 17·0+ 12 20·4 Indefinite P.T. and A.T. obscured by night tremors.
"16 9 40·0 9 49·4 0·75 10 37·2
"17 21 01·6 21 13·9 0·3 21 32·7
"21 7 43·3 7 46·4 7 52·6 Very slight.
"29 7 31·5 7 38·8 0·3 7 46·5
"30 17 13·1 17 18·3 17 24·4 17 24·9 17·0+ 18 29·9 19 29·5
July 1 1 01·8 1 22·4 1 24·4 2·1 1 26·5 2 10·0
"9 Indefinite 10 30·2 11 20·4 2·85 11 32·5 Indefinite P.T. and A.T. obscured by night tremors.
"11 15 57·2 16 08·6 0·35 16 47·9 Swellings merely.
"17 0 29·4 0 36·7 0 38·2 1·5 0 39·3 2 06·7
"23 3 06·8 3 17·2 4 19·3 5·8 5 28·6 7 19·3
"27 23 23·0 Very slight swelling.
"31 9 03·5
August 4 7 51·7
"8 Indefinite 13 21·6 13 23·2 10·3 13 38·6 Indefinite P.T. and A.T. obscured by night tremors.
"11 Small tremor-storm between 21 57·3 and 22 57·3.
"12 13206 13 22·9 Indefinite A.T.obscured by night tremors
"15 4 42·1 Very slight.
"15 Indefinite 8 12·1 0·8 Indefinite P.T. and A.T. obscured by night tremors.
– 572 –

Records of Milne Seismograph No. 20, At Wellington, From January, 1905, To December, 1905
(inclusive).

Latitude, 41°17′ S.; longitude, 174° 47′ E. Greenwich mean civil time. Midnight, O h. or 24h.; hours, 1 to 24, Time in hours, minutes, and tenths of minutes.

P.T., preliminary tremors. A.T., after-tremors. Beg., long waves begin. Max., beginning of maximum phase. Last Phase, beginning of last phase. Amp., half range in millimeters.

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

George Hogben

, Observer.

Date P.T.(from) Long Waves. Amp. End. A.T.(till) B.P. Remarks
Beg Max LastPhase.
1905. H. m. H. m. H. m. H. m. Mm. H. m. H. m. Secs.
January 13 13 31·1 13 35·2 2·7 13 55·2 14 33·8 17·0
"19 21 35·4 21 57·2 4·0
"20 22 43·9 0·5 Probably N.Z. origin.
"20 22 57·3 22 59·1 0·8 23 02·5
" 5 12·1* *Probably long waves along smajor arc.
22 2 52·8 3 01·2 3 11·3 5·0 3 40·1 5 16·9
"23 8 05·1 8 09·2 0·5
February7 19 12·9 19 32·7 19 35·9 1·6 ? 17·0 End obscured by tremors.
"27 17 30·4 17 37·3 2·0 18 50·4
– 573 –
March 18 23 13·5 24 10·4 > 20·0 16·9 Repeats” at and 4 18·5 (March 19)
"22 ? ? 4 33·3 7·0 ? Beg. and end obscured by tremors.
"27 21 48·8 0·5 N.Z.origin.
"27 22 23·8 0·4
"28 2 03·8 0·5
"28 7 49·6 7 52·3 7 53·7 06 16·9
April 4 1 09·8 2 01·3 2 08·9 2 29·6 13·0 7 33·5 17 Origin near Kangra, northern India.
1 17·5
"19 12 35·6 12 40·7 2·2 13 06·3
"25 16 41·0 17 04·3 0·5
"28 15 26·8 15 58·7 16 15·2 0·6 17 29·6 Several “repeats.”
May12 16 23·0 0·9 Long slow movement.
"18 13 45·9 14 02·1 14 05·3 8·2
June 14 10 55·3 11345 11 42·2 200
"16 8 51·5 9 05·8 9 32·9 1·2 Many tremors and small shocks, not all local.
"20 10 50·0 19 12·5 0·6 Many tremors and small shocks, not all local.
"23 20 31·4 2·0 Many tremors and small shocks, not all local.
"24 7 30·0
"30 17 11·6 17 16·8 17 19·0 > 20·0
July 6 16 43·5 17 16·2 17 26·1 17 42·9 1·1
"9 9 37·4 11 15·1 3·0 Case opened just after beg. of P.T.
"9 17 10·8 17 12·9 0·7 Origin near N.Z., probably east.
"10 3 20·9 3 22·0 10 Ditto.
"17 ? 1 31·3 1 34·9 1 56·1 2·5 ?
"23 2 58·6 4 01·6 4 13·0 4 55·8 7·5 16·2 Origin near Chita, Siberia.
"24 9 06·7 9 22·0 1·5
"24 21 54·3 22 12·8 1·5
– 574 –
1905. H. m. H. m. H. m. H. m. Mm. H. m. H. m. Secs.
July 26 20 22·8 21 33·6 1·0
31 7 44·2 7 46·0 3·2 Origin near N.Z., probably east.
August 8 12 43·4 13 18·7 13 20·6 7·2 15 13·9* *Probably long waves along major arc.
17 19 13·4 19 34·9 19 40·1 0·7
20 3 55·4 3 57·3 0·9 Origin probably N.Z.
20 5 18·8 0·4 Origin N.Z.
20 6 40·1 6 44·2 Near N.Z., probably east coast origin.
22 ? 3 45·2 1·1 ?
23 2586 4 00·9 4 06·9 8·5 Very distant origin.
4 13·0
September 8 ? 2 08·1 2 26·1 * 2 41·8 *Only thickening of line.
15 6 20·5 6 34·9 0·7
29 12 04·5 12 08·7 12 14·1 12 22·9 1·2
October 11 22 27·4 22 29·2 0·5 5 54·5* *October 12.
21 18 42·3 18 51·5 0·5 Origin (?) near Constantinople.
November No shocks except small local ones.
December No shocks except small local ones.