ON EARTHQUAKES, 1918-1924. 301 



Notes to 1918. 



Jan. 15d. 15h. Subsequent shock at 15.57.34, recorded at Taihoku and Zikawei. 



Jan. 30d. 21h. Focal depth +0-050. Epicentre revised from 47-5° N. 1290° E. 

 originally adopted. See p. 219 in Summary. 



Feb. 7d. 5h. Focal depth +0025. 



Feb. 9d. 20h. Focal depth +0-050. Epicentre revised from 25-6° N. 134-1° E. 

 See p. 219 in Summary. 



Mar. 23d. Oh. The epicentre 49-0° N. 1440° E. is not satisfactory, but it is far 

 from clear what can be substituted. The best supposition is 42-0° N. 131-0° E. 

 See p. 219 in Summary. 



April lOd. 2h. Focal depth +0-065. Epicentre recorded from 440° N. 131-0° E. 

 ■with 0-070 focus originally given. 



May 20d. 17h. (?) Deep focus ; evidence scarcely sufficient. 



May 22d. 6h. Focal depth +0-050. 



May 23d. lib. Focal depth +0-010. Epicentre revised from 27-0° N. 109-5° W. 



May 25d. 19h. Focal depth +0-015. 



June 21d. 3h. Defective solution. See note in Summary. 



June 24d. 14h. (?) High focus and epicentre at 1-0° S. 154-0° E. as on 1914 

 May 18-19. 



July 8d. lOh. Focal height —0-010. Long note in Summary. 



Aug. 8d. 9h. Longitude given in Summary incorrectly as 153-4° E. 



Aug. lid. 23h. First of a series of 12 shocks. See note in Summary. 



Aug. 22d. 8h. See note in Summary. 



Sept. 7d. 17h. Focal height —0-030. 



Sept. 8d. Oh. Focal height —0-030. 



Sept. 8d. 5h. Normal height. See note in Summary. 



Sept. 12d. 13h. Focal height —0030. 



Nov. 23d. 22h. Focal depth +0-030. 



Dec. 14d. 18h. Focal depth +0-030. 



Dec. 25d. lOh. Focal depth +0070. 



Notes to 1919. 



Jan. Id. 3h. Focal depth +0-030. 

 Mar. Id. 13h. Focal depth +0-030. 



* *'^' oj" iiu" Discussion of residuals suggests focal depth +0-020 and revised 

 9d 3h I epicentre -43-7° -77-0°. 



^*'"' 16d' 15h ^ -^""^^ '^^P*^ +0-015. 

 Mar. 30d. lOh. ' Focal depth +0-030. 

 Apr. 17d. 20h. Focal depth +0010. 

 Apr. 30d. 7h. Evidence in favour of a high focus. 

 May 3d. Oh. Focal depth +0-005. 



May 6d. 19h. Focal height -0-030, after careful discussion. Many antipodal 

 observations support this view. 



May 20d. 4h. The observations of the two shocks are difficult to separate. 



May 29d. lOh. Focal height -0020. 



June Id. 6h. Focal depth +0-040. 



July 25d. 3h. Identification of epicentre doubtful. 



Aug. 9d. 14h. Identification of epicentre doubtful. 



^"S- 5^ J; J^ J; } Focal depth + 0050. 



Aug. 31d. 17h. Focal depth +0-015. Revised solution. In the first instance 

 15-0° S. 165-0° E., as on 1919 Aug. 29, was adopted, with normal focal depth, but 

 found unsatisfactory. 



Sept. 10d.-16d. A rather remarkable series of shocks. 



Oct. 12d. 21h. Study of the residuals suggests a high focus (—0-020 say) with 

 epicentre 2-0° S. 102-5° E. 



Oct. 27d. 3h. Focal depth +0-040. 



Nov. 6d. 7h. Focal depth +0-010. 



Nov. 20d. 14h. Focal depth +0-040. 



