120 F. ÖMOEI. 



of nfter-shocks of the Mino-Owari e:irthqnnke disturbing tlie r/r/z/zV^ 

 of Gif II is about 4000.' 



Some of the great earthquakes in tlie world had areas of disturl)ance 

 niMiiy times bigger tlian the Mino-Owari earthquake, and we nia}" 

 assume that 10000 is probabj}' tlie higlicst possible total number of 

 after-shocks of an earthquake. 



The after-shocks of tlie Kum;imoto earthquake are now approach- 

 ing the end and their total number is 950 or 1000. 



§ LS. Tlie KdijO-thiiiia Eartliqiial'e. 



The Kagoshima earth<|uake took place on September 7th, 18i)o, 

 and is yet only a few months old. Making an estimate from tlie recoi'd 

 already obtairiod f)f its after-shocks (see Figs. 15 and l(i), we find 

 that, at Chiran, the e]>i-f()cal tract, they may continue for three or 

 four years, and that the total number may be some six hundred. 



The earthquake took place at about 2.1() a.m. and the record of 

 its after-shocks was not taken till al)out Î) [).m. of the same day, there 

 bei no- durin^i' this interval probabh' some 100 shocks. Makinnf this 

 addition, the total number of shocks at Chiran during about five 

 months, iij) to tiie end of January, 1(S!)4, is nearly 480, being less 

 than the number of shocks at Kumamoto during the corresponding 

 interval of time after the earthquake of Julv j?<Sth. TSS!), Avhich niay 

 br taken in round numbers as (iOO. 



//. (hi llie Verioillciiij of tlic Fn'ijiiriicji of 

 u'ifter-slwclcs, etc. 



§ 19. What has been said so î-iv about after-shocks relates to 

 the ultimate mean time-relation of their frequency or activity. When 



1 It must be remarked that the conclusions regarding the after-shocks of the Mino-Owari 

 earthquake thus far stated are supposed to hold for Giiu, and may not hold necessarily for 

 other places which are not sufficiently near to th(> j-rincipal epi-focal tract. 



