ON TKE EARTHQUAKE AND VOLCANIC PHENOMENA OF JAPAN. 



93 



Ttvelfth Rejport of the Cornmittee, consisting of the Et. Hon. Lord 

 Kelvin, Mr. K. Etheridge, Professor John Perry, Dr. Henry 

 Woodward, Professor Thomas Gray, and Professor John Milne 

 (Secretary), appointed for the purpose of investigating the 

 Earthquake and Volcanic Phenomena of Japan. {Draivn up 

 by the Secretary.) 



The Gi!Ay-Milne Seismograph. 



The first of the above seismographs, constructed in 1883, partly at 

 the expense of the British Association, still continues to be used as the 

 standard instrument at the Central Observatory in Tokio. I am indebted 

 to Mr. K. Kobayashi, the Director of the Observatory, for the following 

 table of its records : — 



Catalogue of Earthquakes recorded at the Central Meteorological Observatory 

 between Maxj 1891 and April 30, 1892. 



No. 



1,106 

 1,107 

 1,108 

 1,109 

 1,110 



1,111 



1.112 

 1,113 

 1,114 

 1,115 

 1,116 

 1,117 

 1,118 

 1,119 

 1,120 

 1,121 

 1,122 

 1,123 

 1,124 

 1,125 

 1,126 

 1,127 

 1,128 

 1,129 

 1,130 

 1,131 

 1,132 

 1,1.33 

 1,134 

 1,135 

 1,138 

 1,137 

 1.1 3S 

 1,139 

 1,140 

 1,141 



Mouth 



Date 



Tiui. 



H. M. 



8 16 



9 51 



4 13 

 9 40 



10 53 



11 21 







1 37 

 19 



2 20 

 111 11 



38 

 9 22 



11 19 

 6 41 

 9 43 



3 41 

 11 2 



1 38 

 6 

 9 18 



2 21 



5 57 

 8 19 



6 15 



4 40 



8 14 



26 



9 44 

 2 11 



10 49 



11 49 

 8 46 

 6 28 



5 10 



1 1 



48 A.M. 



38 A.M. 



39 r.M. 

 52 A.M. 

 39 A.M 



22 A.M. 

 15 I'.M. 

 44 P.M. 

 55 r..M. 



19 P.M. 

 A.M. 



43 P.M. 



13 P.M. 

 15 P.M. 



49 A.M. 

 42 A.M. 

 48 A.M. 



28 A.M. 



11 I'.M. 



12 l-.M. 

 A.JI. 



58 P.M. 

 30 P.M. 



20 P.M. 



35 A.M. 



21 A.M. 

 51) A.M. 



8 J'.M. 

 10 P..M. 



23 I'.M. 

 25 A.M. 

 58 A.M. 



9 A.M. 

 38 I'.M. 

 23 P.M. 



27 A.M. 



Duration 



Direction 



Maximum 



Period and 



Amplitude of 



Horizontal 



Motion 



Ma.xituum 



Period and 



Amplitude of 



Vertical 



Motion 



sees. mm. 



1891. 



S.S.E.-N.N.W. 

 E.-W. 



E.S.E.-W.N.W. 

 W.S.W.-E.N.E. 



W.N.W.-E.S.B. 



S.-N. 

 W.S.W.-E.N.E. 



N.E.-S.W. 

 E.S.E.-W.N.W. 



N.N.W.-S.S.E. 



S.S.W.-N.N.E. 



N.E.-S.W. 

 S.W.-N.E. 



S.E.-N.W. 



S.-N. 



E.N.E.-W.S.W. 



S.-N. 

 E.S.E.-W.N.W. 



S.-N. 



S.W.-N.E. 



W.S.W.-E.N.E. 



I 1-3 0-6 



very slight 



slight 

 very slight 

 very slight 



sUglit 

 1-3 0-5 

 0-7 0-3 

 very slight 

 0-9 0-55 



very sliglit 

 0-7 0-4 

 0-8 0-3 

 0-6 0-35 

 0-4 0-5 



slight 

 1-0 0-9 

 very slight 

 very slight 

 2-9 1-4 



slight 

 slight 

 1-0 I'O 

 3-6 10-5 



feeble 

 0-2 0-5 

 0-7 0-4 

 0-1 0-2 



slight 

 0-8 0-6 



slight 

 0'6 0-4 

 0-8 0-5 



slight 



sli ght 



sli ght 



gl)t 

 ght 



sli ght 



sli ght 



sli ght 

 0-3 I 0-5 



slight 



sli gilt 



sli 

 sli 



Nature 



of 

 Shock 



ght 

 ght 



slow 

 slow 



slow 



II 



slow 

 quick 



slow 

 alow 

 slow 



quick 

 slow 

 quick 



slow 

 quick 



slow 

 quick 

 slow 



