﻿7$ 
  ' 
  OLDHAM 
  : 
  GREAT 
  EARTHQUAKE 
  OF 
  1897, 
  

  

  Chapter 
  V.— 
  THE 
  RATE 
  AND 
  RANGE 
  OF 
  MOTION 
  OF 
  

   THE 
  WAVE 
  PARTICLE. 
  

  

  In 
  determining, 
  or 
  more 
  correctly 
  speaking 
  giving 
  a 
  numerical 
  

   value 
  to, 
  the 
  violence 
  of 
  an 
  earthquake, 
  there 
  are 
  two 
  quantities 
  

   that 
  have 
  been 
  used 
  ; 
  one 
  the 
  greatest 
  velocity 
  or 
  rate 
  of 
  movement 
  of 
  

   the 
  wave 
  particle 
  and 
  the 
  other 
  the 
  greatest 
  acceleration 
  or 
  change 
  

   in 
  the 
  rate 
  of 
  movement. 
  In 
  the 
  absence 
  of 
  self-recording 
  

   seismographs 
  these 
  may 
  be 
  approximately 
  determined 
  by 
  the 
  size 
  

   and 
  dimensions 
  of 
  objects 
  overthrown 
  and 
  by 
  the 
  distance 
  to 
  

   which 
  objects 
  have 
  been 
  projected 
  by 
  the 
  earthquake. 
  

  

  In 
  the 
  case 
  of 
  this 
  earthquake 
  the 
  data 
  are 
  not 
  so 
  abundant 
  

   as 
  could 
  be 
  wished 
  for, 
  owing 
  to 
  the 
  paucity 
  of 
  objects 
  suitable 
  for 
  

   seismometry, 
  and 
  as 
  the 
  details 
  of 
  the 
  results 
  of 
  the 
  calculations 
  

   are 
  given 
  in 
  Appendix 
  C, 
  together 
  with 
  a 
  short 
  discussion 
  of 
  the 
  vali- 
  

   dity 
  of 
  the 
  formulae 
  in 
  use, 
  they 
  will 
  not 
  be 
  repeated 
  here. 
  It 
  will 
  be 
  

   shown 
  there 
  that 
  the 
  results 
  obtained 
  from 
  the 
  formulae 
  which 
  

   give 
  the 
  values 
  of 
  the 
  two 
  elements, 
  velocity 
  and 
  acceleration 
  of 
  

   wave 
  particle, 
  are 
  not 
  in 
  accordance 
  with 
  each 
  other, 
  and 
  the 
  explana- 
  

   tion 
  of 
  this 
  want 
  of 
  accordance 
  discussed. 
  Here 
  it 
  will 
  suffice 
  

   to 
  say 
  that, 
  even 
  if 
  we 
  cannot 
  compare 
  the 
  values 
  obtained 
  by 
  two 
  

   different 
  formulae 
  at 
  two 
  different 
  places, 
  or 
  even 
  at 
  one 
  and 
  the 
  

   same 
  place, 
  we 
  may 
  still 
  compare 
  the 
  results 
  obtained 
  by 
  the 
  same 
  

   formula 
  from 
  similar 
  data 
  and 
  so 
  see 
  whether 
  there 
  is 
  any 
  differ- 
  

   ence 
  noticeable 
  in 
  the 
  deduced 
  violence 
  of 
  the 
  shock. 
  

  

  Taking 
  the 
  maximum 
  rate 
  of 
  acceleration 
  first, 
  we 
  have 
  the 
  

   following 
  probable 
  average 
  values 
  : 
  — 
  

  

  Dhubri 
  

  

  * 
  2,700 
  

  

  Goalpara 
  • 
  

  

  . 
  4,200 
  

  

  Gauhati 
  . 
  

  

  . 
  3>6oo 
  

  

  Shillong- 
  

  

  . 
  3,600 
  

  

  Chenapunji 
  

  

  , 
  3,000 
  

  

  Sylhet 
  

  

  . 
  3,600 
  

  

  Silchar 
  

  

  . 
  1,200 
  

  

  9 
  ft. 
  per 
  sec. 
  

  

  psr 
  sec. 
  

  

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