﻿Vol. 
  53.] 
  OP 
  AUGUST 
  1892 
  AND 
  NOVEMBER 
  1 
  893. 
  169 
  

  

  (i) 
  Principal 
  Earthquake. 
  A 
  : 
  5.45 
  p.m. 
  

  

  Intensity, 
  7. 
  — 
  Number 
  of 
  records, 
  633, 
  from 
  494 
  different 
  

   places 
  ; 
  also 
  164 
  records 
  from 
  161 
  places 
  at 
  which, 
  so 
  far 
  as 
  known, 
  

   the 
  earthquake 
  was 
  not 
  observed. 
  

  

  The 
  records 
  of 
  this 
  earthquake 
  are 
  less 
  numerous 
  than 
  those 
  of 
  

   the 
  principal 
  earthquake 
  of 
  the 
  preceding 
  year, 
  but 
  they 
  are 
  far 
  

   more 
  evenly 
  distributed 
  over 
  the 
  disturbed 
  area. 
  

  

  Disturbed 
  Area 
  and 
  Isoseismal 
  Lines. 
  — 
  On 
  the 
  map 
  of 
  the 
  earth- 
  

   quake 
  (PI. 
  XI), 
  the 
  isoseismals 
  6, 
  4, 
  and 
  3 
  are 
  shown, 
  and 
  that 
  part 
  

   of 
  the 
  isoseismal 
  5 
  which 
  lies 
  on 
  land. 
  The 
  number 
  of 
  places 
  at 
  

   which 
  the 
  intensity 
  was 
  7 
  are 
  too 
  few 
  to 
  allow 
  of 
  the 
  corre- 
  

   sponding 
  isoseismal 
  being 
  drawn. 
  

  

  Towards 
  the 
  west 
  and 
  south 
  the 
  isoseismal 
  3 
  may 
  possibly 
  extend 
  

   somewhat 
  beyond 
  the 
  limits 
  of 
  the 
  curve 
  laid 
  down, 
  owing 
  to 
  

   the 
  difficulty 
  or 
  impossibility 
  of 
  obtaining 
  observations 
  in 
  these 
  

   directions. 
  Judging, 
  however, 
  from 
  the 
  recorded 
  intensity 
  at 
  the 
  

   places 
  farthest 
  west 
  and 
  south, 
  I 
  do 
  not 
  think 
  that 
  the 
  position 
  

   assigned 
  to 
  the 
  curve 
  can 
  be 
  greatly 
  in 
  error. 
  The 
  length 
  of 
  the 
  

   isoseismal 
  as 
  drawn 
  is 
  313 
  miles, 
  the 
  breadth 
  269 
  miles, 
  and 
  the 
  

   area 
  enclosed 
  by 
  it 
  about 
  63,600 
  square 
  miles, 
  that 
  is, 
  nearly 
  three- 
  

   quarters 
  of 
  the 
  area 
  of 
  Great 
  Britain. 
  This 
  curve 
  may 
  be 
  con- 
  

   sidered 
  as 
  the 
  boundary 
  of 
  the 
  disturbed 
  area, 
  for 
  I 
  have 
  received 
  

   only 
  one 
  record 
  from 
  the 
  region 
  outside, 
  and 
  this 
  one 
  is 
  not 
  free 
  

   from 
  doubt. 
  

  

  The 
  next 
  isoseismal 
  (intensity 
  4) 
  depends 
  on 
  a 
  very 
  large 
  number 
  

   of 
  good 
  observations. 
  Its 
  length 
  is 
  233 
  miles, 
  its 
  breadth 
  196 
  

   miles, 
  and 
  the 
  enclosed 
  area 
  about 
  35,900 
  square 
  miles. 
  Its 
  longer 
  

   axis 
  is 
  directed 
  approximately 
  E. 
  30° 
  N. 
  and 
  W. 
  30° 
  S. 
  A 
  short 
  

   distance 
  north 
  of 
  this 
  line 
  there 
  occurs 
  a 
  small 
  isolated 
  area 
  in 
  the 
  

   neighbourhood 
  of 
  Manchester, 
  in 
  which 
  the 
  intensity 
  was 
  equal, 
  

   or 
  nearly 
  equal, 
  to 
  4. 
  

  

  The 
  isoseismal 
  5 
  is 
  confined 
  to 
  Wales 
  and 
  the 
  north-western 
  corner 
  

   of 
  Devon, 
  and 
  it 
  is 
  therefore 
  impossible 
  to 
  complete 
  the 
  curve. 
  

   The 
  land-area 
  included 
  within 
  it 
  contains 
  about 
  4680 
  square 
  

   miles. 
  

  

  The 
  last 
  isoseismal 
  (intensity 
  6) 
  that 
  can 
  be 
  drawn 
  is 
  roughly 
  

   elliptical 
  in 
  form. 
  Its 
  centre 
  is 
  3| 
  miles 
  north 
  of 
  Whitland, 
  and 
  

   its 
  longer 
  axis 
  is 
  directed 
  E. 
  15° 
  N. 
  and 
  W. 
  15° 
  S. 
  The 
  area 
  

   enclosed 
  by 
  the 
  curve 
  is 
  41 
  miles 
  long, 
  28 
  miles 
  broad, 
  and 
  con- 
  

   tains 
  about 
  940 
  square 
  miles. 
  (See 
  map, 
  p. 
  158.) 
  

  

  The 
  evidence 
  with 
  regard 
  to 
  the 
  position 
  of 
  the 
  originating 
  fault 
  

   is 
  not 
  very 
  complete. 
  Prom 
  the 
  direction 
  of 
  the 
  longer 
  axes 
  of 
  the 
  

   isoseismals 
  6 
  and 
  4, 
  it 
  would 
  follow 
  that 
  the 
  fault-line 
  must 
  

   run 
  about 
  E. 
  15° 
  N. 
  and 
  W. 
  15° 
  S. 
  At 
  several 
  places 
  within 
  this 
  

   isoseismal 
  a 
  few 
  buildings 
  were 
  slightly 
  damaged, 
  chimney-pots 
  or 
  

   parts 
  of 
  chimneys 
  were 
  thrown 
  down, 
  but 
  this 
  occurred 
  very 
  rarely. 
  

   With 
  one 
  exception, 
  all 
  the 
  places 
  lie 
  towards 
  the 
  southern 
  or 
  south- 
  

   eastern 
  part 
  of 
  the 
  isoseismal, 
  and 
  this 
  would 
  appear 
  to 
  indicate 
  that 
  

  

  Q. 
  J. 
  GL 
  S. 
  No. 
  210. 
  w 
  

  

  