U6 



¥. OMORI. 



occurred in the beginning of e:icli of these months in the district under 

 consideration, and where conse(|uently the seismic activity in some parti- 

 cular places was greatly increased. The residual effect of these severe 

 secondary-earthcjuakes, however, as before remarked, soon died away, 

 so that Fig. 28 will fairly represent the distribution of after-shocks in 

 1892 due wholly to the great earthquake of 1891. On the other 

 hand, Fig. 29 will shew principally the effect of the strong shock 

 which took pLice on January 10th, 1894. 



Fig. 27 shews more or less distinctly four axial lines, wliich 

 radiate from the vicinity of Koori and aloni!" which the seismic 

 activity was greater tlian in the neighbouring tracts. In Figs. 28 

 and 29, two of these axial lines, one of which proceeded towards Ibi in 

 the north-western corner of the Mino-Üwari Plain, and the other of 

 "vvhich proceeded to the basin of the Lsé Gulf, became insignificant and 

 Ave have only two distinct axial lines which extend from the same 

 centre towards ENE and ESE, that is, respectively along the u['per 

 valley of the Kiso-gaAva and into the mountain districts of the 

 northern Mikawa. 



The origin of the severe earth(|uake of January 10th, 1(S94, was 

 just at the point of intersection of the above two axial lines, and tliose 

 of the severe earthcjuakes of January 3rd and September 7tli, 1892, 

 were respectively in the viritiities of Gif u (near to the Kiso-gawa) and 

 of Katsukawa (near to Xagoya), so that all these three shocks htid 

 their origins n])proximately on the same axial line running from 

 WNW towards ESE. 



§ OD. On the Cause o,/' llie Great Earlhqiiah- of Octoher â8lli, 1891. 



The fact that the centre of the greatest activity of after-shocks is, 

 not in the Xeo-A^alley where the shock h;id been strongest on the 

 occasion of tlie earthquake of October, 1891, but in a locality near 

 to it, suggests the idea that there had existed a very extensive 



