﻿THE 
  

  

  QUARTERLY 
  JOURNAL 
  

  

  OF 
  

  

  THE 
  GEOLOGICAL 
  SOCIETY 
  OF 
  LONDON 
  

  

  Vol. 
  LIII. 
  

  

  1. 
  0)1 
  the 
  Distribution 
  in 
  Space 
  of 
  the 
  Accessory 
  Shocks 
  of 
  the 
  

   Great 
  Japanese 
  Earthquake 
  of 
  1891. 
  By 
  Charles 
  Davison, 
  

   Sc.D., 
  F.G.S., 
  King 
  Edward's 
  High 
  School, 
  Birmingham. 
  

   (Read 
  November 
  4th, 
  1896.) 
  

  

  I. 
  Introduction. 
  

  

  1. 
  The 
  complete 
  history 
  of 
  the 
  Mino-Owari, 
  or 
  great 
  Japanese, 
  

   earthquake 
  of 
  1891 
  has 
  yet 
  to 
  be 
  written 
  ; 
  but 
  several 
  important 
  

   contributions 
  to 
  it 
  have 
  already 
  been 
  made. 
  Prof. 
  Koto, 
  in 
  an 
  

   admirable 
  memoir, 
  1 
  has 
  traced 
  the 
  course 
  of 
  the 
  extraordinary 
  

   fault-scarp 
  and 
  discussed 
  the 
  origin 
  of 
  the 
  earthquake 
  ; 
  Prof. 
  Omori, 
  2 
  

   with 
  equal 
  care 
  and 
  thoroughness, 
  has 
  investigated 
  the 
  unrivalled 
  

   record 
  of 
  after-shocks 
  ; 
  and 
  Prof. 
  Milne, 
  in 
  his 
  invaluable 
  catalogues 
  

   of 
  Japanese 
  earthquakes, 
  3 
  has 
  provided 
  the 
  materials 
  for 
  detailed 
  

   analyses 
  from 
  many 
  points 
  of 
  view. 
  

  

  My 
  object 
  in 
  this 
  paper 
  is 
  to 
  consider 
  the 
  geographical 
  distribu- 
  

   tion 
  of 
  the 
  numerous 
  shocks 
  which 
  preceded 
  and 
  followed 
  the 
  great 
  

   earthquake. 
  Prof. 
  Omori 
  has 
  discussed 
  the 
  distribution 
  of 
  the 
  after- 
  

   shocks 
  of 
  this 
  and 
  other 
  Japanese 
  earthquakes, 
  chiefly 
  with 
  regard 
  

   to 
  time; 
  but, 
  in 
  an 
  interesting 
  section 
  of 
  his 
  memoir, 
  4 
  he 
  studies 
  

   the 
  distribution 
  in 
  space 
  of 
  the 
  after-shocks 
  of 
  the 
  Mino-Owari 
  

   earthquake. 
  In 
  order 
  to 
  show 
  the 
  difference 
  between 
  Prof. 
  Omori's 
  

   method 
  of 
  treatment 
  and 
  that 
  adopted 
  in 
  the 
  present 
  paper, 
  I 
  will 
  

   first 
  give 
  a 
  brief 
  summary 
  of 
  this 
  part 
  of 
  his 
  work, 
  though 
  it 
  is 
  

   difficult 
  to 
  do 
  justice 
  to 
  it 
  without 
  reproducing 
  his 
  maps. 
  

  

  1 
  ' 
  The 
  Cause 
  of 
  the 
  Great 
  Earthquake 
  in 
  Central 
  Japan,' 
  1891, 
  Joura. 
  

   Coll. 
  Sci., 
  Imp. 
  Univ., 
  Japan, 
  vol. 
  v. 
  (1893) 
  pp. 
  295-353 
  & 
  pis. 
  xxviii.-xxxv. 
  

  

  2 
  ' 
  On 
  the 
  After-shocks 
  of 
  Earthquakes,' 
  Journ. 
  Coll. 
  Sci., 
  Imp. 
  Univ., 
  

   Japan, 
  vol. 
  vii. 
  (1894) 
  pp. 
  111-200. 
  

  

  3 
  ' 
  A 
  Catalogue 
  of 
  8331 
  Earthquakes 
  recorded 
  in 
  Japan 
  between 
  1885 
  and 
  

   1892,' 
  Seismol. 
  Journ. 
  Japan, 
  vol. 
  iv. 
  (1895) 
  pp. 
  i-xxi, 
  1-367 
  (especially 
  

   pp. 
  134-243), 
  with 
  maps. 
  

  

  4 
  Op. 
  supra 
  cit. 
  pp. 
  141-147. 
  

  

  Q. 
  J. 
  G. 
  S. 
  No. 
  209. 
  b 
  

  

  