112 



F. ÜMOET. 



quake wero recorded at the ^Meteorological Stations in Gifii. Xnij-ova, 

 Tsu, Kyoto, :ind 0.-:ak;i; those of the Kumamoto earthqunke, first at the 

 Pr.^ectural Office, and subsequent!}^ at the Meteorological -Station in 

 KuiU'iinoto; :ind those of the Kagoshima earthquake at the Police 

 Station ;ind the District Office in Chiran in Kagoshiin;i Prefecture. 



§ 3. The number of after-shocks are found to diminisli ra])idly 

 with distance from the origin of the iriitinl eartlujunke,' as may l)e 

 s?en from the fillowiiiü- list: — 



Of the six cities mentit^ned in the above taljle, Gifu, Xagoya, and 

 Tsu !U-e situated nearly along the axis of the de])ression ^Yhich extends 

 tn^m the Sea of Is(' to the ])lain of Mino and Owari, while the remain- 

 ing three, Kyoto, Os-dca. and Tokyo are situated in a line nnighlv 

 perpendicular to thi.s axis. These two sets of places must be regarded 

 as distinct. The decrease with distance in the numlx-r of after-shocks 

 is. in the case of the secc^nd group, seen to be more ra])id than in the 

 inverse ratio. 



In tlie case (^f the Kumamoto and Kagoshima earthquakes, the 



1 The origin of the initial earthquake is not necessarily the same with those of the after 

 shocks, so that in the immediate neighbourhood of the origins the statement in the text is by 

 no means true. 



2 1 )'( = 2.4t miles or 3.93 kilometres. 



3 The earthquake of Octoljer 2Sth, 1891 was most violent in the Xeo-Valley. See Dr. Koto's 

 excellent paper, " On the Cause of the Great Earthquake in Central Japan, 1891." (Jour. Sei. 

 Coll., vol. V. pt. IV) ; also § 35 of the present paper. 



1 These numliers do not include the shocks within a few hours inmiediately after tlie 

 t-^arhquake, which w^'re not recorded. See Tables XI and XIT, and also ^ 17. 



