22

C—lA.

Records of Milne Seismograph No. 16, at Christchurch.

Latitude, 43° 31' 50" S.; longitude, 172° 38' 9" E.; time employed, Greenwich civil time. Date. tommencement. Maxima. Semiamplitude. Total Duration. Natural Boom Period. Remarks. 1913. .pril 18 ,, 25 H. M. 2 10-4 18 08-0 H. M. 2 16-5 18 39-0 18 47-0 18 50-3 Millimetres. 2-0 21 20 3-5 H. M. 0 54 Seconds. 22 390 0 25-7 22 40-0 1 5-7 18 53-6 0-6 0-2 1-5 2 0 (approx.) 0 0-8 0 51 134 13-4 Local shock. ,, 25 May 3 8 Large waves commence 18 h. 51-2 m. Beginning and duration obscured by air-tremors. 9 17 18 5 55-6 8 43-2 2 20-9 18 55-8 18 59-1 19 1-5 19 3-4 19 6-8 19 21-3 19 26-3 19 31-5 6 0-6 From 8h. 46-6m. to 8h. 47-6m. 2 39'7 2 41-5 2 44-2 2 48-9 2 50-5 2 54-2 3 0-5 to lh. 24-7m. on 25th From 10h. 40-7m. to 10h. 41-7m. 19 54-9 11 58-2 12 2-5 2-2 2-6 2-9 1-9 1-9 10 10 0-9 11 0-5 0-7 1-0 0-9 1-0 0-9 0-6 0-6 0 47-6 0 27-6 2 36-5 13-5 15-0 15-0 24 23 31-7 Slight tremors only. 25 10 31-7 0-4 0 48-8 14-0 Series of slight tremors only. >> 25 28 31 19 53-9 11 551 0-4 0-4 1-4 2 29-6 0 23-8 14-0 14-2 14-2 Large waves commence 12 h. 15 m. Beginning and duration obscured by air-tremors. • 12 5-8 12 9-9 12 11-8 12 14-0 12 17-9 12 19-5 12 21-0 12 25-2 12 34-9 12 37-3 12 39-5 4 3-4 10 20-5 10 27-9 10 31-2 10 34-7 2-0 21 9-6 8-0 3-2 4-5 4-5 2-4 1-8 1-8 1-9 0-5 0-8 1-0 1-4 0-6 Slight tremors till 4 h. 50-5 m. 6h. 56-6 m. 5h. 13-3 m. June 3 5 2 9-0 10 6-3 2 430 2 10-6 15-8 15-8 6 0 18-2 6 28-1 2 46-7 4 30-6 >» 8 11 4 30-9 4 32-3 3 501 9 26-3 0-5 0-5 0-5 0-6 0 131 15-8 13 17 24 26 3 13-9 9 16 r l 3 22-3 5 3-3 2 181 0 40-6 15-8 15-8 Very slight tremors till 5 h. 7-1 m. Second phase 5 h. 7-9 m. Large waves commence 5 h. 8-8 m. 5 9-4 4-2 July 1 7 8 4 2-8 9 360 22 17-5 5 13-9 4 20-2 9 46-7 22 27-3 22 30-4 6 510 6 52-8 23 330 2 50 7 58-8 12 7-2 16-5 0-5 0-6 20 11 1-7 1-5 0-6 0-3 10 2-2 0 57 1 58-5 3 15-6 16-6 16-6 16-2 Large waves commence 22 h. 30-2 m. 22 6 36-4 2 0-6 15-0 i> 25 25 26 28 23 280 1 12-2 7 56-0 Obscured 3 400 0 49-5 15-0 150 15-0 15-0 Slight tremors only. Large waves commence 12 b< 6*5 m. Beginning and duration obscured by air-tremors. 12 10-6 12 13-7 12 20-3 16 22-2 2-6 7-0 1-3 1-4 Large waves commence 16 h. 15-4 m. Beginning and duration obscured by air-tremors. »» 29 150 16 24-5 16 300 1-5 1-2