﻿"^°L 
  53*] 
  GREAT 
  JAPANESE 
  EARTHQUAKE 
  OE 
  1891. 
  

  

  Table 
  II. 
  

  

  11 
  

  

  1885- 
  

  

  -1889. 
  

  

  Jan. 
  1, 
  1890— 
  Oct. 
  27, 
  1891. 
  

  

  Nov. 
  1, 
  1891— 
  Dec. 
  31, 
  1892. 
  

  

  E 
  

  

  22 
  

  

  E 
  11 
  

  

  K 
  1168-5 
  

  

  D 
  

  

  10 
  

  

  ?} 
  6 
  

  

  E 
  749-5 
  

  

  M 
  

  

  3-5 
  

  

  F 
  475 
  

  

  £} 
  

  

  3 
  

  

  K 
  4 
  

  

  H 
  199 
  

  

  C 
  

  

  G- 
  143 
  

  

  £.} 
  

  

  2-5 
  

  

  M 
  85-5 
  

  

  D 
  1 
  o 
  

   F 
  f 
  d 
  

  

  A 
  24 
  

  

  %} 
  

  

  2 
  

  

  P 
  21 
  

  

  L 
  

   * 
  J 
  

  

  L 
  205 
  

  

  p 
  

  

  0-5 
  

  

  D 
  18 
  

  

  K 
  

  

  1 
  

  

  G 
  2-5 
  

  

  N 
  15 
  

  

  i} 
  

  

  

  

  A 
  2 
  

  

  C 
  14 
  

  

  H 
  1*5 
  

  

  B 
  12-5 
  

  

  III. 
  The 
  Prepakation 
  eor 
  the 
  Great 
  Earthquake. 
  

  

  10. 
  According 
  to 
  Prof. 
  Milne, 
  the 
  last 
  severe 
  earthquakes 
  at 
  and 
  

   near 
  Gifu 
  took 
  place 
  in 
  1826, 
  1827, 
  and 
  1859. 
  1 
  On 
  May 
  12th, 
  1889, 
  

   a 
  rather 
  strong 
  earthquake 
  occurred, 
  disturbing 
  an 
  area 
  of 
  about 
  

   48,700 
  square 
  miles, 
  and 
  having 
  its 
  centre 
  within 
  or 
  near 
  the 
  

   rectangle 
  F. 
  

  

  The 
  average 
  yearly 
  number 
  of 
  shocks 
  in 
  the 
  district 
  from 
  January 
  1st, 
  

   1885, 
  to 
  October 
  27th, 
  1891, 
  is 
  30. 
  During 
  the 
  five 
  years 
  1885-1889, 
  

   the 
  annual 
  percentage 
  of 
  epicentres 
  falling 
  within 
  the 
  rectangles 
  

   A-P 
  lies 
  between 
  25-0 
  and 
  51*1, 
  the 
  average 
  being 
  42 
  ; 
  in 
  1890 
  and 
  

   1891 
  (until 
  October 
  27th) 
  it 
  rises 
  to 
  a 
  little 
  over 
  60 
  ; 
  while, 
  during 
  

   the 
  fourteen 
  months 
  succeeding 
  the 
  great 
  earthquake, 
  the 
  monthly 
  

   percentage 
  is 
  never 
  less 
  than 
  90 
  and 
  twice 
  is 
  as 
  much 
  as 
  100. 
  

  

  11. 
  During 
  the 
  first 
  five 
  years, 
  the 
  numbers 
  of 
  epicentres 
  lying 
  

   inside 
  the 
  rectangles 
  A-P 
  are 
  respectively 
  13, 
  7, 
  4, 
  15, 
  and 
  14 
  ; 
  

   and 
  the 
  numbers 
  occurring 
  outside 
  them 
  are 
  16, 
  12, 
  12, 
  18*5, 
  and 
  

   13*5. 
  Thus, 
  the 
  number 
  of 
  epicentres 
  lying 
  within 
  the 
  fault- 
  

   region 
  increases 
  and 
  decreases 
  with 
  the 
  total 
  number 
  of 
  epicentres 
  in 
  

   the 
  Mino-Owari 
  district, 
  showing 
  that 
  the 
  great 
  faults 
  are 
  to 
  a 
  large 
  

   extent, 
  though 
  not 
  entirely, 
  responsible 
  for 
  the 
  excess 
  or 
  defect 
  in 
  

   the 
  average 
  number 
  of 
  earthquakes. 
  

  

  It 
  is 
  remarkable 
  that, 
  during 
  these 
  five 
  years, 
  only 
  one 
  epicentre 
  

   lies 
  within 
  the 
  rectangle 
  K, 
  which 
  is 
  by 
  far 
  the 
  most 
  prominent 
  seat 
  

   of 
  after-shocks 
  in 
  November 
  and 
  December 
  1891, 
  while 
  in 
  the 
  

   rectangles 
  M 
  and 
  P 
  there 
  were 
  only 
  three 
  epicentres 
  during 
  the 
  

   same 
  period. 
  At 
  this 
  time, 
  therefore, 
  the 
  secondary 
  fault 
  was 
  

   almost 
  inactive. 
  

  

  At 
  the 
  northern 
  end 
  of 
  the 
  main 
  fault 
  (rectangles 
  A 
  and 
  B) 
  there 
  

  

  are 
  no 
  epicentres 
  at 
  all 
  during 
  the 
  five 
  years 
  ; 
  at 
  the 
  south-eastern 
  

  

  (rectangles 
  G 
  and 
  H) 
  there 
  are 
  four 
  ; 
  and 
  6*5 
  in 
  the 
  continuation 
  

  

  of 
  the 
  main 
  fault 
  to 
  the 
  south-east 
  (rectangles 
  L 
  and 
  N). 
  The 
  

  

  1 
  Seismol. 
  Journ. 
  Japan, 
  vol. 
  i. 
  (1893) 
  p. 
  149 
  ; 
  Brit. 
  Assoc. 
  Eep. 
  (1892) 
  p. 
  128. 
  

  

  