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18

Records of Milne Seismograph No. 16, at Christchurch. 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. = Aftertremors less than 2mm. complete range; B.E. = Beginning and end of vibrations not less than 2mm.; Amp. = Half-range in millimeters.

Maxima. | , P r ' 0 T m B. Amp. j B. *jj B.P. Remark.. From To I I I I I APRIL, 1909. H. m. H. in. H. in. H. m. Mm. H. m. H. m. Seos. 10 5 33-4 5 43-8 6 459 and 5 46-9 6-0 6 25-2 7 38-6 15-5 12 1 14-3 1 18-5 1 22-6 .. 3-95 1 37-1 2 43-3 .. 22 7 14-8 .. 7 15-8 .. 0-2 .. 7 42-2 .. i 27 12 54-7 I 13 09-0 13 19'3 .. 6-8 13 43-8 14 56-1 .. j May, 1909. 2 7 06'1 7 12-3 7 15-4 I 1-9 7 175 8 30-9 2 i .. .. 15 24-4 .. .. .. .. Very slight. 2 1 18 20-3 18 25-4 18 29-6 .. 2-5 18 34-2 ! 19 17-2 .. 11 Indefinite 13 21-7 .. 1-75 .. Indefinite .. In middle of air tremors. 12 0 57-2 .. 1 19-3 ... 0-3 .. 1 52-4 .. 17 8 20-2 .. 8 31-0 .. 0-9 .. 9 56-9 .. 24 7 13-4 .. 7 17-0 .. 0-5 .. 7 25-8 .. 25 4 59-7 .. 5 276 .. 1-1 .. 6 08-0 ! .. 30 Indefinite 21 35-9 21 37-9 .. 2'9 21 472 22 44'6 .. P.T. obsoured by air tremors. June, 1909. 8 18 62-7 19 24-8 19 87-7 .. 2-2 20 041 2145-0 | 6 11-8 ■ 6 •• SB :: °-. 7 :: :: ':: I 7 13-9 .. .. .. Indefinite .. j A.T. obsoured by air tremors. 9 0 51-0 .. .. .. .. .. 1 550 .. Very small; maximum at beginning. B 8 9 12 20 25'5 20 29-1 20 84-3 .. 7-5 2101-7 22 01-7 14 7 31-1 .. 7 38-4 .. 0-4 .. 7 53-4 15 1 19-8 .. .. .. .. 2 00-1 .. Thiokening merely. 26 9 35-6 .. 9 36-6 .. 01 .. 9 39-7 27 7 22-0 7 80-3 7 35-5 .. 4-7 7 56-1 9 21-0 28 Indefinite .. 15 29-0 .. 0-7 Indefinite .. P.T. and A.T. obscured by air tremors. 12 14 15 26 27 28 July, 1909. 1 2 8 10 1 18 03-7 .. 18 10-9 .. 0-8 .. 13 31-6 .. 2 6 25'9 .. 6 28-5 .. 0-1 .. 6 570 .. 5 Indefinite .. 17 55-8 .. 3-5 .. Indefinite .. P.T. and A.T. obsoured by air tremors. in ,„ . n . q (13 42-8 13 58-9 0-4 10 18 403 '• J14 11-3 14 13-4 .. 26 22 06-6 .. 22 08'1 .. .. .. 22 221 .. Slight thickening. 27 I 4 34-5 .. 4 36-1 I 0-2 .. 5 03-5 80 I 1116-5 | .. 11 16-5 and 11 31'2 08 .. 18 507 .. First maximum at beginning i of quake. (?) Origin, Mexico 26 27 30 August, 1909. 4 6 18-3 .. 6 20-4 0'1 .. 6 24-5 .. 6 5 46-0 5 49'1 .. 0-4 .. 5 57-4 .. 10 6 561 .. 7 01-2 .. 0-25 .. 7 17-8 .. 18 12 19-7 .. 12 21-7 .. 0-25 .. 12 25-9 16 7 54-6 .. 8 17-7 .. 0-4 .. 8 36-6 .. 18 0 85-4 0 46-2 0 56-4 .. 8-9 1 05-7 2 04-6 .. In progress while attending to instrument. 29 28 69'5 .. .. .. .. .. 25 33-4 .. Thickening of line. September, 1909. 8 | 8 11-2 | .. 18 18-4 I .. j 0-35 .. ,8 29-7 I .. 25 12 29-6 j .. 12 32-7 | .. I 0-5 .. 12 44-0 I .. October, 1909. 3 1 28-8 .. .. .. .. .. 3 44-2 .. Thickenings. 4 13 53-2 .. 14 07-0 ... 09 .. Indefinite .. A.T. obscured bv air tremors. 21 0 45-5 .. .. .. .. .. 1 40-4 .. Thickenings. 23 Indefinite) .. 2128-9 .. .. .. 2156-6 .. P.T. obscured by air tremors. 27 1 32-3 .. 1 83-8 .. 0-35 .. 2 08-5 30 10 33-8 I 11 02-0 .. 0-9 .. Indefinite .. A.T. obsoured by air tremors.