﻿^l* 
  53-] 
  0F 
  AUGUST 
  1892 
  AND 
  NOVEMBER 
  1 
  893. 
  

  

  171 
  

  

  Time-Relations 
  of 
  the 
  Sound 
  and 
  Shock. 
  — 
  The 
  numbers 
  of 
  places 
  

   at 
  which 
  the 
  beginning, 
  etc., 
  of 
  the 
  sound 
  preceded, 
  coincided 
  with, 
  

   or 
  followed 
  the 
  beginning, 
  etc., 
  of 
  the 
  shock 
  are 
  given 
  in 
  the 
  

   following 
  Table 
  : 
  — 
  

  

  

  Beginning. 
  

  

  Epoch 
  of 
  

  

  Maximum 
  

   Intensity. 
  

  

  End. 
  

  

  V- 
  

  

  c. 
  

  

  

  p. 
  

  

  4 
  

  

  5 
  

   

   

  

  c. 
  

  

  27 
  

  

  3 
  

   1 
  

  

  1 
  

  

  / 
  

  

  7 
  

  

  2 
  

   

   

  

  P- 
  

  

  3 
  

  

  2 
  

   2 
  

   

  

  c. 
  

  

  2 
  

  

  5 
  

  

  2 
  

   2 
  

  

  41 
  

  

  8 
  

   6 
  

   

  

  Pembrokeshire 
  and 
  Caermar 
  

  

  thenshire 
  

  

  Kest 
  of 
  Wales 
  

  

  'I 
  

  

  49 
  

  

  10 
  

   17 
  

  

  4 
  

  

  7 
  

  

  6 
  

   2 
  

   1 
  

  

  9 
  

  

  2 
  

   4 
  

  

  

  

  England 
  

  

  Ireland 
  

  

  

  Totals 
  

  

  80 
  

  

  16 
  

  

  15 
  

  

  9 
  

  

  32 
  

  

  9 
  

  

  7 
  

  

  11 
  

  

  55 
  . 
  

  

  

  These 
  figures 
  lead 
  to 
  the 
  same 
  conclusion 
  as 
  those 
  for 
  the 
  earth- 
  

   quake 
  of 
  1892 
  — 
  namely, 
  that 
  the 
  beginning 
  of 
  the 
  sound 
  generally 
  

   preceded 
  that 
  of 
  the 
  shock, 
  their 
  epochs 
  of 
  maximum 
  intensity 
  

   coincided, 
  and 
  the 
  end 
  of 
  the 
  sound 
  followed 
  that 
  of 
  the 
  shock. 
  

  

  At 
  three 
  places 
  the 
  sound 
  is 
  said 
  to 
  have 
  ceased 
  before, 
  or 
  just 
  

   as, 
  the 
  shock 
  began. 
  These 
  are 
  Eglwyswrw 
  and 
  Tenby 
  in 
  

   Pembrokeshire, 
  and 
  Moat 
  Lane 
  Junction 
  in 
  Montgomeryshire. 
  

   The 
  observations 
  at 
  the 
  first 
  two 
  places 
  contradict 
  others 
  made 
  

   there 
  and 
  at 
  a 
  large 
  number 
  of 
  places 
  in 
  the 
  immediate 
  neigh- 
  

   bourhood, 
  and 
  must 
  therefore 
  be 
  rejected. 
  At 
  and 
  near 
  Moat 
  Lane 
  

   Junction 
  the 
  records 
  are 
  less 
  discordant, 
  and 
  it 
  is 
  possible 
  that 
  the 
  

   instant 
  when 
  the 
  sound 
  was 
  loudest 
  preceded 
  that 
  when 
  the 
  shock 
  

   was 
  strongest. 
  Still 
  farther 
  north-east, 
  at 
  Ellesmere 
  in 
  Shropshire, 
  

   the 
  epochs 
  of 
  maximum 
  intensity 
  of 
  sound 
  and 
  shock 
  coincided, 
  

   while 
  the 
  end 
  of 
  the 
  sound 
  followed 
  that 
  of 
  the 
  shock. 
  This 
  was 
  

   also 
  the 
  case 
  at 
  Courtown, 
  in 
  Co. 
  Wexford. 
  

  

  The 
  most 
  probable 
  conclusion 
  to 
  be 
  drawn 
  from 
  all 
  the 
  observa- 
  

   tions 
  is 
  that 
  the 
  epochs 
  of 
  maximum 
  intensity 
  coincided 
  in 
  the 
  

   neighbourhood 
  of 
  the 
  epicentre 
  and 
  near 
  the 
  boundary 
  of 
  the 
  sound- 
  

   area, 
  while 
  at 
  intermediate 
  stations 
  near 
  the 
  'longer 
  axis 
  of 
  the 
  

   area 
  the 
  epoch 
  of 
  maximum 
  intensity 
  of 
  the 
  sound 
  preceded 
  that 
  of 
  

   the 
  shock. 
  The 
  explanation 
  would 
  seem 
  to 
  be, 
  not 
  that 
  the 
  velo- 
  

   city 
  of 
  the 
  sound 
  was 
  greater 
  than 
  that 
  of 
  the 
  larger 
  vibrations, 
  

   but 
  that 
  the 
  north-eastern 
  lateral 
  margin 
  of 
  the 
  focus 
  was 
  of 
  con- 
  

   siderable 
  length, 
  so 
  that, 
  at 
  moderate 
  distances, 
  the 
  sound-vibrations 
  

   which 
  appeared 
  loudest 
  came 
  from 
  a 
  point 
  much 
  nearer 
  than 
  the 
  

   centre 
  of 
  the 
  focus 
  ; 
  while, 
  at 
  great 
  distances, 
  the 
  relative 
  inten- 
  

   sities 
  of 
  the 
  sound-vibrations 
  from 
  the 
  lateral 
  margin 
  and 
  from 
  the 
  

   upper 
  margin 
  of 
  the 
  focus 
  were 
  sensibly 
  the 
  same, 
  so 
  that 
  the 
  

   principal 
  vibrations 
  were 
  felt 
  during 
  the 
  interval 
  when 
  the 
  sound 
  

   was 
  loudest. 
  

  

  h2 
  

  

  