﻿58 
  

  

  OLDHAM 
  : 
  GREAT 
  EARTHQUAKE 
  OF 
  1897. 
  

  

  be 
  depended 
  on 
  within 
  the 
  limits 
  of 
  the 
  accuracy 
  of 
  measurement 
  of 
  

   the 
  diagram. 
  The 
  results 
  of 
  the 
  measurement, 
  as 
  communicated 
  by 
  

   Major 
  S. 
  G. 
  Burrard, 
  R.E., 
  in 
  charge 
  of 
  Tidal 
  and 
  Levelling 
  operations 
  

   are 
  as 
  follows 
  : 
  — 
  

  

  The 
  first 
  effect 
  of 
  the 
  earthquake 
  was 
  to 
  cause 
  the 
  'level 
  of 
  the 
  water 
  to 
  fall 
  

   1 
  inch, 
  between 
  4-53 
  p.m. 
  and 
  4-55 
  p.m., 
  June 
  12th. 
  

  

  At 
  4-55 
  p.m. 
  the 
  water 
  rose 
  suddenly 
  £ 
  inch, 
  after 
  that'the 
  change 
  in 
  the 
  water- 
  

   level 
  was 
  normal 
  till 
  5 
  p.m., 
  when 
  it 
  rose 
  and 
  fell 
  3 
  inches 
  in 
  rapid 
  succession 
  many 
  

   times 
  for 
  a 
  period 
  of 
  3 
  minutes. 
  After 
  that 
  a 
  just 
  perceptible 
  alternate 
  rise 
  and 
  fall 
  

   of 
  at 
  most 
  1 
  inch 
  continued 
  till 
  5-21, 
  when 
  the 
  change 
  in 
  the 
  water-level 
  again 
  

   became 
  normal 
  ; 
  at 
  5-54 
  this 
  slight 
  agitation 
  recommenced 
  and 
  lasted 
  till 
  5-56. 
  

  

  The 
  first 
  small 
  disturbance 
  between 
  4-53 
  and 
  4-55 
  P.M. 
  was 
  

   doubtless 
  seismic, 
  and 
  is 
  the 
  only 
  indication 
  we 
  have 
  of 
  any 
  pre- 
  

   monitory 
  tremor. 
  It 
  was 
  not, 
  however, 
  a 
  sensible 
  disturbance, 
  at 
  any 
  

   rate 
  there 
  is 
  no 
  record 
  of 
  its 
  having 
  been 
  felt 
  by 
  any 
  one, 
  and 
  it 
  

   may 
  be 
  neglected 
  for 
  purposes 
  of 
  comparison. 
  The 
  main 
  disturbance 
  

   commenced 
  somewhat 
  suddenly 
  immediately 
  after 
  5b. 
  om. 
  P. 
  M. 
  

  

  Another 
  instrumental 
  record 
  was 
  obtained 
  at 
  the 
  Alipur 
  Observa- 
  

   tory 
  in 
  the 
  disturbance 
  of 
  the 
  barograph 
  trace, 
  a 
  reproduction 
  of 
  

   which 
  is 
  given 
  in 
  fig. 
  6. 
  This 
  would 
  have 
  been 
  a 
  valuable 
  record 
  

  

  Fig. 
  6. 
  Portion 
  of 
  trace 
  of 
  the 
  barograph 
  at 
  Alipur 
  on 
  12th 
  June 
  1807, 
  showing 
  

   the 
  effect 
  of 
  the 
  earthquake. 
  

  

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