C—la.

Earthquake Reports— continued.

19

Ho. Date. Character. Phase. Time. G.C.M.T. .Boom Period. Amplitude. Ae. Remarks. 1922. 7 Feb., 20 r 8 ? SRj SR 2 L M L M P 8 ? L M P L M P L M P S L M P S L M P S SR L M P S L M P L M H. M. 8. 7 50 24 7 55 06 7 56 42 8 00 42 8 04 18 16 05 54 16 10 00 17 00 42 17 05 06 17 11 48 17 15 00 18 01 54 18 05 24 18 08 24 12 30 48 12 34 06 12 36 12 13 33 12 13 39 12 13 42 48 13 48 00 4 09 48 4 14 06 4 22 12 4 23 36 10 08 42 10 14 00 10 18 48 10 21 06 10 42 36 6 39 54 6 40 54 6 42 00 6 43 36 11 26 42 11 30 54 11 31 54 09 20 54 09 24 00 09 25 30 09 32 30 17 49 24 17 50 30 17 53 18 3 23 12 3 27 00 3 28 12 8 17 48 8 20 48 6 35 54 6 40 00 6 42 42 21 43 24 21. 44 24 21 46 30 1 20 24 1 24 06 1 25 00 3 58 18 3 58 54 3 59 30 4 02 12 20 46 30 20 46 48 20 48 12 4 22 00 4 23 06 4 23 36 9 00 30 9 04 36 13 19 12 13 19 18 4 45 12 4 49 18 4 55 54 5 02 48 5 14 24 5 16 06 s. MM. 8 „ 20 1-6 In midst of microseisms. 8 1-6 9 Mar., 7 9 r 10 „ 10 r 1-5 Duration, 30m. 10 11 „ 12 r 2-0 Duration, lh. + . 11 12 „ 20 r 3-5 Duration, lh. + . 12 r 3-0 Duration, lh. 30m. 13 28 II April 5 r i-3 Duration, lh. 20m. v 3-0 Duration, 30m.+ . 15 28 May 1 r 2-8 10 17 18 1.1 11 V 2-0 P L M 2 S L M SR? L M oL M S? L M P L M P L M P S L M P? L M P L M oL M P M P PPvl S SR, L M ? microseism. 19 12 r 4 Mj not defined. May 13 r 10 20 21 14 u 6-4 22 17 u 23 Juno 24 V 15 16 1-0 21 July 13 V 11 Duration, 35m. i. 25 14 V i-4 V 6-9 Duration, 40m. 20 15 Duration, 22m. 27 17 V 0-5 28 18 r 0-6 Duration, 13m. 6-4 RF3. Ae actual, 0-25 nun. 0 off Chilian coast (89°±). P distinctly emergent, becoming more i after 30 seconds. A change of period after 90 seconds caused a larger instrumental range (evidencing more regular periodicity in the P waves) of 1-5 mm. The S phase commencing at 4h. 55m. 54s. was also followed by a large instrumental amplitude of 16 mm. 2 minutes after commencement. Instrumental amplitude continued large for over 2 hours. Followed by microseisms for 13 hours. PR 2 seems not to exist in the record, and SR., is not definite. 20 Aug. 16 d 1-5 30 Nov. 11 u 15 23