﻿14 
  DE. 
  CHAELES 
  DAVISON 
  ON 
  THE 
  [Feb» 
  1 
  897, 
  

  

  comparative 
  insignificance 
  after 
  the 
  first 
  two 
  months, 
  and 
  gives 
  

   place 
  to 
  others 
  in 
  the 
  rectangles 
  E 
  and 
  F, 
  the 
  order 
  during 
  the 
  first 
  

   fourteen 
  months 
  being 
  the 
  following 
  : 
  — 
  

  

  K, 
  K, 
  F, 
  E, 
  E, 
  E, 
  E, 
  F, 
  F, 
  E, 
  E, 
  E, 
  F, 
  E 
  and 
  F 
  (equal). 
  

  

  The 
  maps 
  themselves 
  furnish 
  the 
  most 
  interesting 
  evidence 
  of 
  this 
  

   continuous 
  displacement 
  of 
  the 
  epicentres, 
  though 
  for 
  details 
  Table 
  I. 
  

   should 
  be 
  consulted. 
  One 
  or 
  two 
  points 
  may 
  be 
  referred 
  to. 
  Thus, 
  

   it 
  will 
  be 
  seen 
  that 
  the 
  rectangles 
  C 
  and 
  D 
  are 
  more 
  or 
  less 
  com- 
  

   plementary 
  ; 
  when 
  one 
  is 
  the 
  seat 
  of 
  action, 
  the 
  other 
  is 
  generally 
  

   in 
  repose. 
  So 
  also, 
  but 
  to 
  a 
  much 
  less 
  extent, 
  are 
  the 
  rectangles 
  

   E 
  and 
  F, 
  one 
  being 
  as 
  a 
  rule 
  much 
  more 
  active 
  than 
  the 
  other, 
  

   though 
  they 
  approach 
  equality 
  in 
  this 
  respect 
  during 
  the 
  last 
  three 
  

   months. 
  1 
  

  

  Perhaps 
  the 
  most 
  interesting 
  result 
  of 
  all 
  is 
  the 
  distribution 
  of 
  

   epicentres 
  along 
  the 
  main 
  fault. 
  A 
  glance 
  at 
  the 
  maps 
  shows 
  that 
  

   this 
  is 
  not 
  continuous. 
  In 
  the 
  two 
  rectangles 
  which 
  intervene 
  

   diagonally 
  between 
  B 
  and 
  D 
  there 
  was 
  almost 
  complete 
  repose, 
  

   except 
  for 
  the 
  great 
  earthquake, 
  during 
  the 
  whole 
  time 
  considered, 
  

   there 
  being 
  only 
  three 
  epicentres 
  within 
  them 
  in 
  November 
  1891 
  

   and 
  one 
  in 
  January 
  1892. 
  2 
  Again, 
  in 
  the 
  rectangle 
  G 
  there 
  is 
  

   another, 
  though 
  far 
  less 
  strongly-marked, 
  break, 
  which 
  does 
  not 
  

   occur, 
  however, 
  in 
  December 
  1891 
  and 
  April 
  1892, 
  as 
  will 
  be 
  seen 
  

   in 
  figs. 
  3 
  & 
  5 
  (pp. 
  5 
  & 
  6). 
  Thus, 
  the 
  distribution 
  along 
  the 
  fault 
  may 
  

   be 
  summed 
  up 
  as 
  follows 
  : 
  — 
  a 
  nearly 
  central 
  region 
  of 
  extraordinary 
  

   activity, 
  and 
  two 
  more 
  or 
  less 
  isolated 
  districts 
  near 
  or 
  surrounding 
  

   the 
  extremities 
  of 
  the 
  fault. 
  

  

  The 
  seismic 
  activity 
  of 
  these 
  terminal 
  districts 
  was 
  not 
  only 
  less 
  

   marked, 
  but 
  also 
  of 
  shorter 
  duration, 
  than 
  that 
  of 
  the 
  central 
  

   district. 
  At 
  the 
  northern 
  end 
  of 
  the 
  main 
  fault, 
  as 
  well 
  as 
  at 
  the 
  

   south-eastern 
  end 
  of 
  its 
  assumed 
  continuation, 
  all 
  action 
  practically 
  

   died 
  out 
  before 
  April 
  1892. 
  In 
  the 
  southern 
  terminal 
  region 
  of 
  

   the 
  fault-scarp 
  it 
  lasted 
  until, 
  if 
  not 
  after, 
  the 
  close 
  of 
  the 
  same 
  

   year. 
  

  

  A 
  similar 
  withdrawal 
  of 
  action 
  from 
  its 
  southern 
  extremity 
  

   characterizes 
  the 
  secondary 
  fault, 
  only 
  two 
  epicentres 
  lying 
  in 
  its 
  

   neighbourhood 
  after 
  March 
  1892. 
  

  

  The 
  after-shocks 
  of 
  the 
  Mino-Owari 
  earthquake 
  for 
  the 
  first 
  

   fourteen 
  months 
  were 
  thus 
  subject 
  to 
  the 
  following 
  conditions 
  : 
  — 
  

   decline 
  in 
  frequency, 
  decrease 
  in 
  the 
  area 
  of 
  seismic 
  action, 
  and 
  a 
  

   gradual 
  but 
  oscillating 
  withdrawal 
  of 
  that 
  action 
  to 
  a 
  more 
  or 
  less 
  

   central 
  district. 
  

  

  1 
  These 
  and 
  other 
  facts 
  seem 
  to 
  show 
  that 
  the 
  main 
  fault 
  is 
  a 
  system 
  of 
  two 
  

   or 
  more 
  rather 
  than 
  the 
  single 
  fault 
  indicated 
  by 
  the 
  scarp. 
  

  

  2 
  On 
  September 
  7th, 
  1892, 
  a 
  strong 
  earthquake 
  occurred, 
  which 
  disturbed 
  an 
  

   area 
  of 
  nearly 
  44,000 
  square 
  miles. 
  The 
  rectangles 
  most 
  shaken 
  lie 
  along 
  a 
  line 
  

   passing 
  immediately 
  south-east 
  of 
  the 
  B 
  point 
  and 
  approximately 
  at 
  right 
  angles 
  

   to 
  the 
  direction 
  of 
  the 
  main 
  fault. 
  A 
  transference 
  of 
  strain 
  from 
  the 
  latter 
  to 
  a 
  

   possible 
  longitudinal 
  fault 
  along 
  the 
  line 
  indicated 
  may 
  perhaps 
  account 
  for 
  the 
  

   comparative 
  quiescence 
  along 
  this 
  part 
  of 
  the 
  main 
  fault. 
  

  

  