ox THE AFTEK-SHOCKS OF EARTHQUAKES. l^y 



II or -1 li to .the SSW of the Togi-muni, ILigiii District (Xoto 

 province); and that uf tlie second «h(3ck at a point about 2 ri to the 

 SSE of that of the first, also in the sea and near to the town of 

 Takahama in the same district. All the shocks in Xoto which fol- 

 lowed these two were snitdl/ 



The Kag-oshima etirth([uuke of September 7th, l<Sl)o, was followed, 

 on Januar}' 4th, 18D-1, about four months later, by a second shock whose 

 area of disturbance was a little greater than that (jf the first. These 

 two shocks again originated from different centres. The epicentre 

 of the first shock was irdand and near Chiran-mura in the Kiire 

 District, at about 7 /•/ to the SSW of Kagoshima; while that of the 

 second shock was in the sea at about 2 /•/ t(3 the vrest of Xoma- 

 saki, the distance between the two epi-centres being about 10 ri. The 

 damage caused by the first shock was much greater than that by 

 the second. The effect of the second shock on the frequency of earth- 

 quakes at Chiran was merely to increase slightly the amplitude of the 

 period of seismic activity daring which it occurred (at the epoch 

 marked a, Fig. 15). 



In tlie case of the ^Mino-Owari earthrpiake, all the subsequent 

 shocks, more than oDOO in number, were far smaller than the initial 

 one itself. It i.> to be remarked that the three se\-erest of these 

 numerous after-shocks, namely, the earthquakes of January ord and 

 September 7th, l.S<)2, and of January 10th, 181U, all originated in 

 the Mino-Owari Plain, and not in the Neo-\'alley, wherein indeed no 

 very strong shock has ever occurred since the date of the first great one. 



§ oo. T]tc Mino-Ou-ari Eartlniualc. 



It thus seems that the Xeo-\^dley, or the principal epi-focal 

 tract, is ste;idilv settling down to equilibrium, while the Mino-Owari 

 Plain, having probably lines of weakness under it not completely 



1 Unfortunately the after-shocks of the Xoto earthquake were not carefully recorded. 



