The Diagram of the Semi-destructive Earthquake 

 of June 20th, 1894 (Tköyö). 



By 



S. Sekiya, Rigakuhakushi. Professor of Seismology, 



•Alia 



F. Ömori, Rigakuslii, 

 lijjpencil L liiversity, Japan. 



rri. XXX.j 



The eartlR|iiake of June Z^Otli. 1N94, was the inoat violent, that 

 lias shaken rökyö since the well-kncnvn Lireat catastrophe ol the l^nJ 

 Year of Ansei (IS55). The mean radius of the disturbed area was about 

 NO ri or 200 miles, and the total land area was 7.10U square ri, or 

 •4:^,000 square miles. The meizoseismal tract A\as a zone lying to the 

 east of Tök\o. and extending in a X-S direction from the vicinit\' uf 

 ihc town of Iwatsuki to Tokyo ]xi\', Xo house was absolutely des- 

 troyed, but iu the hjwer parts of Tökvö. many brick buildings receiwd 

 severe damage, and chimneys in particular were mostly thrown dcjwn; 

 some do.:û (godowns) h;id their plastered mud walls ver\- much cracked 

 and shaken down, tomb-st(jJies and islüdOrü (stone lanterns in gardens) 

 were overtiu'ned, small cracks were formed in the ground, and, in a 

 lew cases, ejection of water took place. The number of casualties in 

 the three Prefect lu-es of Tokyo. Kanagawa. and Saitama were 2G per- 

 sons killed and 171 wounded. In fact it was the severest shock that 

 the younger generation has lelt in this metropolis. 



The diagram of the earthquake (PL XXX.) was taken by a 

 Large Motion Seismograph, set u\> in the Seismological Institute of 



